PLATE XXIII. 
Bellekophon Lyra. 
Page 113. 
Fig. 1. Dorsal view of an imperfect cast. 
Bellerophon Leda. 
Page 110. 
Fig. 2. The interior of a specimen lying in the rock, showing the form of the inner lip. 
Fig. 3. Lateral view of a specimen similar to the last. 
Fig. 4. A portion of the ventral side of a specimen, showing a pustulose columellar lip. 
Fig. 5. A large specimen having the two sets of striae nearly equal in strength. 
Fig. 6. A specimen enlarged to two diameters, showing strong transverse markings. 
Fig. 7. A further enlargement of the right side of the lip, showing the surface chai-acters. 
Fig. 8. An enlargement of the surface, showing the character of the mesial band and lateral striae. 
Fig. 9. A specimen enlarged to two diameters, showing the transverse lines entirely subordinate. 
Fig. 10. A further enlargement of one side of the specimen fig. 9. 
Fig. 11. A specimen enlarged to two diameters, showing still stronger concentric markings than in fig. 6. 
Fig. 12. Enlargement to one and a half diameters of a specimen where the revolving lines are coalescent 
and less strong on the body than on the expanded portion ; becoming almost obsolete near the 
margin. 
Fig. 13. A still greater enlargement of the last. 
Fig. 14. A specimen with revolving lines very strongly marked, which become prominent and irregular 
on the expanded portion. 
Fig. 15. Enlargement to two diameters of a portion of the specimen fig. 14, showing the characteristic 
features more distinctly. 
Fig. 16. The body-volution of an imperfect specimen, enlarged to two diameters, showing nearly equal 
cancellating striae. 
Bellerophon Lyra. 
Page 113. 
Fig. 17. The anterior expansion of the last volution, natural size. 
Fig. 18. A somewhat compressed specimen enlarged to two diameters, showing the surface-markings. 
Fig. 19. A very symmetrical specimen enlarged to two diameters, showing the surface characters and 
distant arching laminae crossing the narrow, rounded dorsal band. 
Fig. 20. A further enlargement of a part of the specimen fig. 19. 
