PLATE XXIV. 
Bellerophon natator. 
Page 108. 
Fig. 1. View of the fragment described. The specimen shofcs the form] of the expanded peristome, its 
strong undulations, and the impression of the inner lip. 
Bellerophon triliratus. 
Page 117. 
Fig. 2. A fragment of the dorsal surface of a specimen, showing the carination and band. 
Bellerophon patultjs. 
Page 100. t 
Fig. 3. Dorsal view of a cast, probably of this species. 
Fig. 4. Lateral view, showing the gradual obsolescence of the transverse striae 'on the sides and towards 
the umbilicus, which is well defined. 
Fig. 5. The aperture, showing a continuous thickened lip, with the pustulose callosity not extending to the 
margin of the aperture. 
Fig - . 6. A posterior view of the preceding - specimen. 
Fig. 7. A posterior view of another specimen, where the pustules are elongate and the margin not sinuate. 
Fig. 8. A specimen having a wide callosity, with fine pustules arranged upon the arching transverse stria;. 
The specimen is partially enclosdti in concretionary shale with striated surfaces. 
Fig. 9. An enlargement of a portion of the dorsal surface, showing the stronger arching ridges and finer 
intermediate striae. 
Fig. 10. A large, depressed, subhemispheric specimen which is nearly denuded of the shell; probably B. 
'patulus. 
* 
Bellerophon Helena. 
Page 111. 
Fig. 11. Dorsal view, enlarged from the original specimen. 
Bellerophon Otsego. 
Page 104. 
Fig. 12. Dorsal view, showing the broad band with the retrally curving striae and the lobation of the sides 
of the shell. 
Bellerophon rudis. 
Page 103. 
Fig. 13. A specimen showing the undulations, crossed by interrupted revolving ridges. 
Fig. 14. A large, imperfect specimen, with five strong ridges or undulations crossing the axis. 
Fig. 15. A smaller specimen, having the same number of undulations. 
All the specimens are somewhat distorted by pressure. 
Bellerophon triliratus. 
Page 117. 
Fig. 16. An imperfect specimen, showing broadly expanded and finely striated sides. 
Fig. 17. A larg - e, nearly perfect specimen, showing the Carina, the dorsal band and striated surface; the 
expanded portion marked with strong concentric undulations. 
Fig. 18. A large, imperfect specimen, showing the distinctly tricarinate character. 
Fig. 19. A well preserved and symmetrical specimen, with the dorsal band very distinct, 
