PALEONTOLOGY. 

 PLATE VII. 



Page. 

 Syncvclonema kiuiua U&M 383 



Fig. 1. Enlarged view of an interior cast of a right valve, showing the filling of the carti- 

 lage pit and what appears to be th<i mu.scular impression. 



PTEKIA UNGUIKORMI8 E. & S 384 



Fig. 2. View of the left valve of an imperfect specimen. 



Fig. 3. View of the right side of the same, showing the muscular marking and pallial line. 



Ptkkia (Oxytoma) nebrascana E. & S 385 



Fiu. 4. View of a large left valve, natural size. 



PTEIUA (PSEUDOPTERIA) FIBROSA M. <& H 386 



Fig. 5. Restored view of a left valve. 



I'TERIA (PsEUDOPTERIA) 6UBLEVIS Whitf 387 



I-'iG. (). View of left valve of the ordinary size and form, preserving the small anterior wing. 



Inoceramus b.\rabini Morton 398 



Fig. 7. View of an imperfect right valve of this form. 



Inoceramus vanuxemi M. & H 396,398 



Fig. 8. View of a small individual representing the var. atibcircularis M. 



Fig. 9. View of a left valve representing the form referred by Mr. Meek to I. proximus 



Toumey. 

 Fig. 10. View of a left valve of the variety described iu this vol. p. 398. 



Inoceramus problematicus Schlot. T 389 



Fig. 11. View of an imperfect specimen of a right valve referred with doubt to this species. 



Inoceramus sagensis O 393 



Fig. 12. View of a right valve of rather large size, presenting the ordinary features of the 

 species. 



