PLATE XVI. 



Orthis propinqua. 

 Pig. 1-3, 7-11. A series of specimens showing variations in size. Page 43 



Orthis vanuxemi. 



Fig. 4-6, 12, 12a-14. A series of specimens showing variation in size. Page 45 



Trematospira hirsuta. 



Fig. 15-19. Profile, dorsal, ventral, front and cardinal view of speci- 

 men. Page 136 



Terebratula roemingeri. 



Fig. 20-22. Profile, ventral and dorsal view of a specimen. Page 155 



Orthis livia. 



Fig, 23, 24. Dorsal and ventral view of a specimen. Page 40 



Athyris vittata. 



Fig. 25-29, 31, 32. A series of specimens showing variations in size 



and ornamentation. Page 87 



Fig. 30. Ventral valve broken to show position of spiral cones. 



