USNM:PAL
Billingsella plicatella Walcott
USNM PAL52263L
USNM:PAL
Xenorthis stosei (Bassler)
USNM PAL66164B
USNM:PAL
Billingsella romingeri (Barrande)
USNM PAL52267B
USNM:PAL
Billingsella plicatella Walcott
USNM PAL52263G A. Peale
United States, Montana, Gallatin County
USNM:PAL
Xenorthis stosei (Bassler)
USNM PAL66164A
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441B
USNM:PAL
Billingsella corrugata Ulrich & Cooper
USNM PAL91442D
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL35213A
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441J E. Kirk
United States, Wyoming
USNM:PAL
Billingsella texana Bell in Bell & Ellinwood
USNM PAL185522
United States, Texas
USNM:PAL
Xenorthis jonasae Ulrich & Cooper
USNM PAL92835A
USNM:PAL
Billingsella romingeri (Barrande)
USNM PAL52267J
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL52235C
USNM:PAL
Billingsella corrugata inornata Ellinwood
USNM PAL185537
United States, Texas
USNM:PAL
Billingsella plicatella Walcott
USNM PAL142368
USNM:PAL
Billingsella exporrecta rugosicostata Walcott
USNM PAL52250C
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441A
USNM:PAL
Xenorthis stosei (Bassler)
USNM PAL66164D
USNM:PAL
Xenorthis jonasae Ulrich & Cooper
USNM PAL92835E G. Cooper
United States, Maryland
USNM:PAL
Billingsella corrugata Ulrich & Cooper
USNM PAL91442H
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441H
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL34771D
USNM:PAL
Billingsella corrugata Ulrich & Cooper
USNM PAL91442K
USNM:PAL
Billingsella simplex Resser & Endo
USNM PAL86709B R. Endo
China, Manchoukuo Prov
USNM:PAL
Billingsella bivia Walcott
USNM PAL52254A R. Rowe 1901-00-00
United States, California, Inyo County
USNM:PAL
Billingsella major Walcott
USNM PAL52256A J. James
United States, Wisconsin, Sauk County
USNM:PAL
Billingsella marion Walcott
USNM PAL53676A
USNM:PAL
Billingsella appalachia Walcott
USNM PAL57073B C. Walcott
United States, Tennessee, Hawkins County
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL185547
United States, Texas, Blanco County
USNM:PAL
Billingsella romingeri (Barrande)
USNM PAL52267C
USNM:PAL
Billingsella romingeri (Barrande)
USNM PAL52267F
USNM:PAL
Billingsella anomala Walcott
USNM PAL52233A Curtice
United States, Alabama, Cherokee County
USNM:PAL
Billingsella plicatella Walcott
USNM PAL52263H
USNM:PAL
Billingsella corrugata inornata Ellinwood
USNM PAL185535
United States, Texas, San Saba County
USNM:PAL
Billingsella striata Walcott
USNM PAL52279D A. Peale
United States, Montana, Madison County
USNM:PAL
Billingsella olen Walcott
USNM PAL69712
USNM:PAL
Billingsella olen Walcott
USNM PAL69711 Walcott & Walcott 1922-09-00
Canada, British Columbia
USNM:PAL
Billingsella archais Walcott
USNM PAL69717 Walcott Et Al
Canada, British Columbia
USNM:PAL
Billingsella anomala Walcott
USNM PAL52233C Curtice
United States, Alabama, Cherokee County
USNM:PAL
Billingsella appalachia Walcott
USNM PAL57073B
USNM:PAL
Billingsella exasperata Bell
USNM PAL111886
United States, Montana
USNM:PAL
Billingsella dice Walcott
USNM PAL52248C
United States, Vermont, Franklin County
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL185540
United States, Texas, Burnet County
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL34771A
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL185546
United States, Texas, Blanco County
USNM:PAL
Billingsella simplex Resser & Endo
USNM PAL86709A R. Endo
China, Manchoukuo Prov
USNM:PAL
Billingsella harlanensis Walcott
USNM PAL52252F C. Walcott
United States, Tennessee, Hawkins County
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441N
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441R
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441Q
USNM:PAL
Billingsella striata Walcott
USNM PAL52279B A. Peale
United States, Montana, Madison County
USNM:PAL
Billingsella major Walcott
USNM PAL52256A
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441G
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441T
USNM:PAL
Billingsella dice Walcott
USNM PAL52248A
United States, Vermont, Franklin County
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL185541
United States, Texas, Llano County
USNM:PAL
Xenorthis jonasae Ulrich & Cooper
USNM PAL92835C G. Cooper
United States, Maryland
USNM:PAL
Billingsella exporrecta (Linnarsson)
USNM PAL52249F
USNM:PAL
Billingsella whitfieldi (Walcott)
USNM PAL57041A
USNM:PAL
Billingsella olen Walcott
USNM PAL69712 Walcott & Walcott 1922-09-00
Canada, British Columbia
USNM:PAL
Billingsella richthofeni Walcott
USNM PAL52559B Blackwelder
China, Shantung
USNM:PAL
Billingsella exporrecta rugosicostata Walcott
USNM PAL52250A
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL142398
USNM:PAL
Xenorthis stosei (Bassler)
USNM PAL92836C
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441S
USNM:PAL
Billingsella corrugata Ulrich & Cooper
USNM PAL91442D E. Ulrich
United States, Oklahoma
USNM:PAL
Billingsella archais Walcott
USNM PAL69718 Walcott Et Al
Canada, British Columbia
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441P
USNM:PAL
Billingsella rhomba Ellinwood
USNM PAL185529
United States, Texas, San Saba County
USNM:PAL
Xenorthis stosei (Bassler)
USNM PAL66164B
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL34770A
USNM:PAL
Billingsella corrugata Ulrich & Cooper
USNM PAL91442I
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL35213F
USNM:PAL
Billingsella pumpellyi Walcott
USNM PAL52558B
USNM:PAL
Billingsella harlanensis Walcott
USNM PAL52252D C. Walcott
United States, Tennessee, Hawkins County
USNM:PAL
Billingsella striata Walcott
USNM PAL52279C
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441I
USNM:PAL
Billingsella harlanensis Walcott
USNM PAL52252B C. Walcott
United States, Tennessee, Hawkins County
USNM:PAL
Billingsella pumpellyi Walcott
USNM PAL52557B Blackwelder & Willis
China, Shantung
USNM:PAL
Billingsella plicatella Walcott
USNM PAL52263B
USNM:PAL
Billingsella weedi (Walcott)
USNM PAL69798C
USNM:PAL
Billingsella archais Walcott
USNM PAL69716 Walcott Et Al
Canada, British Columbia
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441B E. Kirk
United States, Wyoming
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL52235A
USNM:PAL
Billingsella dice Walcott
USNM PAL52248F C. Walcott
United States, Vermont, Franklin County
USNM:PAL
Billingsella perfecta Ulrich & Cooper
USNM PAL91441N E. Kirk
United States, Wyoming
USNM:PAL
Billingsella appalachia Walcott
USNM PAL57073C
USNM:PAL
Billingsella exporrecta rugosicostata Walcott
USNM PAL52250D
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL51403A
USNM:PAL
Billingsella plicatella Walcott
USNM PAL52263I
USNM:PAL
Billingsella rectangulata Cooper
USNM PAL116722
USNM:PAL
Billingsella marion Walcott
USNM PAL53676A Walcott & Burling
Canada, British Columbia
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL34777D
USNM:PAL
Billingsella borukaevi Nikitin
USNM PAL406067
Antarctica
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL51403B
USNM:PAL
Billingsella plicatella Walcott
USNM PAL52263G
USNM:PAL
Billingsella aojii Resser & Endo
USNM PAL86708A R. Endo
China, Manchoukuo Prov
USNM:PAL
Billingsella plicatella Walcott
USNM PAL52263C
USNM:PAL
Billingsella corrugata Ulrich & Cooper
USNM PAL91442B
USNM:PAL
Billingsella coloradoensis (Shumard)
USNM PAL34771G