Plate 10 



Figures 1. Elphidiurn advenum (Cushman). X 60. (After H. B. Brady.) o, 

 side view; h, apertural view. 



2. Elphidium advenum (Cushman). X 80. From Tortugas, Fla. a, 



side view; h, apertural view. 



3. Elphidium advenum (Cushman), var. margaritaceum (Cushman*, 



new variet}-. X 80. From beach, Newport, R. I. a, side view; 

 b, apertural view. 



4. Elphidium poeyanum (d'Orbigny). (After type figure.) a, side 



view; b, apertural view. 



5. Elphidium poeyanum (d'Orbigny). X 80. From Montego Bay, 



Jamaica, a, side view; b. aj^ertural view. 



6. Elphidium articulaium (d'Orbigny). (After type figure.) a, side 



view; b, apertural view. 

 7,8. Elphidiu?u articulatum id' Orhigny). X 60. From Falkland Islands. 



67 



