PLATE 63. 
( Supplementary. ) 
Page 
Figs. 1-5. Orthis idoneus. 52 
1. Dorsal view of a small and somewhat distorted individual. 
2-5. Ventral, dorsal, profile and cardinal views of a large and characteristic individual. 
Figs. 6-13. Spirifera maia... 416 
6, 7. Dorsal and ventral views of a young specimen. 
8-11. Dorsal, ventral, profile and front views of an elongate specimen. 
12. Dorsal view of a broadly oval form, where the cardinal line is short and gradually rounded. 
13. Dorsal view of a partially exfoliated specimen, showing a large area. 
Fig. 14. Spirifera disjuncta. 243 
14. Cast of a ventral valve, showing the impressions of the dental lamellae reaching to the 
front of the valve. 
Figs. 15-18. Meristella rostrata. . .. 307 
15 -18. Dorsal, ventral, profile and front views of the specimen described. 
Figs. 19-22. Meristella lenta... 420 
19-22. Dorsal, ventral, profile and front views of a specimen of the ordinary size and form. 
Figs. 23-25 Rhynchospira subglobosa. 421 
23, 24. Dorsal and ventral views of the cast of a specimen of medium size. 
25. Dorsal view of the cast of a larger specimen which has been slightly distorted by pressure.. 
Figs. 26-29. Leiorhynchus, multicosta. 358 
26 - 29. Dorsal, ventral, profile and front views of a cast of this species, from Richmondville, 
Schoharie Co., N. Y. 
Figs. 30-32. Strophodonta plioata. 114 
30 - 32. Dorsal, profile and ventral views of the specimen described. 
Figs. 33-36. Trematospira (?) nobilis. 412 
33. Dorsal view of a crushed and distorted specimen retaining both valves, and showing the 
surface marking in a very perfect manner. 
34. View of a dorsal valve, showing the beak and part of the crura. 
35. Fragment of another dorsal valve, showing the impression of the crura and their attachment 
to the hinge-plate. 
36. Interior of a ventral valve, showing the teeth and the elevated plate bearing the muscular 
impressions. 
