PLATE XXIV. 



Bkllerophon natator. 



Page 108. 

 Vig. 1. View of the fragmeni described. The specimen shows the foi-m' of the expanded peristome, its 

 Btronff undulations, and the impression of the inner lip. 



Bkllerophon triliratus. 



PHgO 117. 



Fig. 2. A fragment of the dorsal surface of a specimen, showing the carination and band. 



Bellerophon patulus. 



Page 100. 

 Fig. 3. Dorsal view of a cast, pi-obahly of this species. 

 Fig. 4. Latei-al view, showing tlie grailual obsolescence of the transverse strise on the sides and towai-ds 



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 apertui-e. 

 Fig. 6. A jwsterior view of the pi-eceding specimen. 



Fig. 7. A posterior view of another specimen, where the pustules are elongate and the mai-gin not sinuate. 

 Fig. 8. A specimen having a wide callosity, with fine pustules an-anged upon the arching transverse sti-ia;. 



The spe<Mmen is partially enclosed in conci-etionary shale with striated surfaces. 

 Fig. 9. An enlargement of a portion of the doi-sal surface, showing the stronger arching ridges and finer 



intermediate strise. 

 Kg. 10. A large, depi-essed, subhemispheric specimen which is nearly denuded of the shell ; probably B. 



patulus. 



Bellerophon Helena. 



Pago 114. 

 Fig. 11. Dorsal view, enlarged from the original specimen. 



Bellerophon Otsego. 



Page 104. 

 Pig. 12. Dorsal view, showing the bi-oad band with the retrally curving striae and the lobation of the sides 

 of the shell. 



Bellerophon rudis. 



Pago 103. 

 Fig. 13. A specimen showing the undulations, crossed by interrupted revolving ridges. 

 Fig. 14. A large, impei-fect specimen, with five strong ridges or undulations crossing the axis. 

 Fig. 15. A smaller sjiecimen, having the same numl>er of undulations. 

 All the sj)ecimen8 ai-e somewhat distorted by pressure. 



Bellerophon trxliratds. 



Page 117. 

 Fig. It). An imperfect specimen, showing broadly expanded and finely striated sides. 

 Fig. 17. A large, nearly perfect specimen, showing the carina, the doi-sal band and striated surface ; the 



expanded i)ortion marked with strong concentric undulations. 

 Fig. 18. A large, imperfect specimen, showing the ilistinrtly tricarinate character. 

 Fig. 19. A well presen-ed and symmetrical specimen, with the dorsal band very distinct. 



