Plate 16 



Fjgures 1-3. Amphistegina lessonii d'Orbigny. X 45. Figs. 1, 2, Dry Tor- 

 tugas, Fla. Fig. 3, San Juan Harbor, P. R. a, a, a, dorsal 

 views; b, b, b, ventral views; c, c, c, peripheral views. 



4 a-c. Cymbaloporeita squammosa (d'Orbigny). X 50. Montego Bay, 



Jamaica, a, dorsal view; b, ventral view; c, peripheral view. 



5 a-c. Tretomphalus bulloides (d'Orbigny). X 50. Specimens without 



"float chamber." Montego Bay, Jamaica, a, dorsal view; 

 b, ventral view; c, peripheral view. 



161 



