PLATE XXV. 
Bellerophon Thalia. 
Page 105. 
Fig. 1. Dorsal view of a specimen slightly compressed, and somewhat lengthened in form. 
Fig. 2. An obliquely compressed specimen, showing the small umbilicus in an internal cast, and preserving 
some remains of surface strye. 
Fig. 3. A laterally compressed specimen. 
Bellerophon acutilira. 
Page 106. 
Fig. 4. Lateral view of a compressed specimen enlarged to two diameters, showing the surface stria acutely 
recurved. 
Fig. 5. Dorsal view of a small specimen which preserves the shell on the outer part of the volution.- 
Figs. 6, 7, 8. Three views of a large, nearly perfect specimen, retaining the shell with surface-markings. 
Bellerophon MiERA. 
Page 119. 
Fig. 9. Oblique lateral view of a specimen, showing the recurving of. the lip over the umbilicus. The cast 
retains faint marks of the surface characters. 
Fig. 10. A specimen showing the form of the aperture and reflection of the lip over the sides of the shell. 
This and the following figs. 11-14 are from gutta-percha impressions in the natural mold. 
Fig. 11. A specimen showing the surface characters and the form of the shell. 
Fig. 12. A similar specimen compressed, with coarser structure. 
Fig. 13. Lateral view of the specimen fig. 11. 
Fig. 14. A specimen enlarged two diameters, showing the surface characters and form of the shell. 
Bellerophon obsoleths. 
Fig. 15. Dorsal view of a specimen as obtained by a gutta-percha cast in the natural mold. The surface 
striae make an abrupt retral curve in the centre of the shell. 
Bellerophon crenistria. 
Page 116. 
Fig. 16. Dorsal view of a specimen enlarged four diameters. 
Fig. 17. A specimen enlarged three diameters. 
Fig. 18. Dorsal view of a specimen partially imbedded in the rock; enlarged to four diameters. 
Bellerophon Mjera. 
Page 119. 
Fig. 19. Dorsal view of a cast, marked only by the sharp dorsal carina. 1 
Cyrtolites (Cyrtonella) pileolus. 
Page 125. 
Figs. 20-22. Three views of the internal cast of a specimen of the usual form. Fig. 20 shows the impression 
of a fold on the left side of the posterior lip. 
Fig. 29. Dorsal view of a specimen preserving the shell. 
Cyrtolites (Cyrtonella) mitella. 
Page 123. 
Figs. 23, 25. Lateral and dorsal views of a specimen with the shell partially removed. 
Fig. 24. The apertural side of a cast, showing a sinuosity or fold of the lip on the right side. 
Figs. 26, 27. Two views of the typical specimen, an internal cast, with, the dorsal carina strongly marked. 
Fig. 28. Enlargement of the surface from the side of a specimen which preserves the shell. 
