I 



PLATE F//.— (Continued). 

 Crania scabiosa Hall^ 1866. 



Page 220. 

 Fio-. 15. Profile view of a specimen of Ortliis biforatus, partially covered with shells 

 of this species. 



Crania Ljelia JIall, 1866. 



Page 220. 

 Fig. 16. Ventral view of a specimen of Streptorhynchus planumbona, showing four 

 individuals of this species attached to its surface. 



Leptob ol us insignis Hall, 1871. 



Page 227. 

 Fig. 17. Exterior view of specimens of the species, enlarged to six diameters. 



Leptobolus occidentalis Hall, 1871. 



Page 227. 

 Fig. 18. Exterior of a specimen of this species, enlarged to six diameters. 



Lep tob ol us l epis Hall, 1871. 



Page 226. 

 Figs. 19, 20. Interiors of a ventral and dorsal valve, enlarged. • 



OrTHIS {?) ELLA Hall 



Thirteenth Report N. T. State Cabinet Xat. IIist.,p'age 121. 



Fig. 21. Dorsal view of specimen, more finely plicated than ordinarily; enlarged. 



Trema tis miller uncta ta Hall, 1866. 



Page'221. 

 Fig. 22. Dorsal view, preserving a portion of the punctate covering of the shell. 

 Fig. 23. Ventral view of the same individuals, showing the terminal slit, the beak 



and depressed area of the dorsal valve. 

 Fig. 24. Profile view of the same specimen. 

 Fig. 25. A partial cast of the interior of the dorsal valve of the same species (?) 



showing muscular impressions. The figures representing this species 



are enlarged. 



Tellinomya pectunculoides Hall, 1871. 



Page 228. 

 Fig. 26. View of the interior of the left valve, enlarged to two diameters. 



Tellinomya levata Hall 



Nucula levata. Pal. N. Y. vol. I, p. 150. 

 Fig. 27. Interior of right valve, showing hinge-structure, etc., enlarged to thi'ee 

 diameters. Collection of Mr. Dyer. 



Lyrodesma Cincinnatensis Hall, 1871. 



Page 227. 



V 



Fig. 28. Interior of a right valve, showing the hinge structure ; enlarged. 



