EXPLANATIONS OF PLATES. 



Plate 1. 



Figs. 1-7. %Chilostomella ovoidea. (After Brady.) Figures 1-4, front or side 

 views, X 50. Figure 5, dorsal view by transmitted light, X 70. 

 Figure 6, apertural view, X 50. Figure 7, side view by trans- 

 mitted light, X 70. 

 8-10. Chilostomella ovoidea. (From photographs.) X 50. D2036. Fig- 

 ure 8, side view; 9, ventral view; 10, dorsal view. 

 11-13. Allomorphina trigona. (After Brady.) Figures 11 and 13, ventral 

 views, X 60. Figure 12, specimen viewed by transmitted light, 

 showing the arrangement of the chambers, X 100. 

 14-16. Seabrookia earlandi. (After Heron- Allen and Earland.) X 120. 

 Figures 14 and 15, front views; 16, side view. 

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