92 
Plate IV 
Cyrtodonta planumbona n. sp. 
Figure 1. View of natural cast of right valve. (Page 52.) 
Figure 2. Anterior view showing the even convexity of the species. 
(Page 52.) 
Modiolopsis compacta n. sp. 
Figure 3. Left valve of a partly exfoliated shell. (Page 53.) 
Allodesma umbonata n. sp. 
Figure 4. View of fragments of left valve, X 2. (Page 54.) 
Eotomaria rotunda n. sp. 
Figure 5. View from above, X 2. (Page 55.) 
Figure 6 . View of umbilicus, X 2. (Page 55.) 
Figure 7. View from the side, X 2. (Page 55.) 
Raphistoma distincta n. sp. 
Figure 8. View from above, X 2. 
Figure 9. View showing the course of the striae on the upper portion, X 2. 
(Page 56.) 
Figure 10. View of the umbilicus of a second specimen, X 2. (Page 56.) 
Figure 11. Side view of No. 10, X 2. (Page 56.) 
Leperdiiia trentonensis n. sp. 
Figure 12. View from above, X 2. (Page 57.) 
Figure 13. Lateral profile view, X 2. (Page 67.) 
