Beede.] Carboniferous Invertebrates. 185 



PLATE XVIII. 



Pinna subspatulata^ (p. 145.) 



1. Semidiagrarnmatic dorsal aspect. Does not show dorsal ridge. 

 16. Aspect of broken right valve. 



lc. Same of left valve. 

 Id. Cross-section. All natural size. 

 Aviculopinna americana, (p. 143.) 



2. Lateral view of shell. Natural size. 

 Pinna subspaiulata, (p. 14."). i 



3. View of another cast from different locality. 



PLATE XIX. 



Entolium avxculatum^ ip. 113. ) 



1. Left valve. (After Meek.. 

 Aviculopecten coxanus, (p. 124.) 



2. View showing left valve. Natural size. (After Rogers.) 



Chaznomya leavemvorthensis, (p. 172.) 



3. Lateral view of specimen. (After Meek.) 

 36. Dorsal aspect of same. 



Myalinaf exasperata, (p. 141.) 



4. Left ? view of type. Natural size. 

 Pasidonomyaf pertenuis, (p. 136.) 



5. Left ? valve of type. 

 Posidonomyaf recurva, (p. 135.) 



6*7. Left ? valve of type. 



66. Right ? valve of another specimen. 



0'-. Left? valve of the preceding, with a part of the shell adhering on one 

 side. The beak is somewhat crushed and twisted, so that it does 

 not seem to extend above the hinge. All natural size. 



PLATE XX. 



Allorisma subcuneatum, (p. 169.) 



1. Lateral view of specimen. (After Keyes. i 

 V>. Dorsal aspect of the same. 



Macrodon eangamonenais f (p. 146.) 



2. Dorsal view of left valve. 



26. Lateral view of same. Natural size. 

 :< wickia topekaensis, (p. 171.) 



3. Left valve of specimen. 



Yoldia knoxenaief (p. 154.) 



4. Specimen with valves distended. By mistake, this is not the specimen 



described in text, and may possibly be a different species. 



Edmondia nebra&censis, (p. 166.) 



."). Left valve of specimen. Natural size 

 13-vi 



