Plate 11 



Figures 1. Elphidiuvi arclicum (Parker and Jones). X 60. (After Balkwill 

 and Wright.) Off Kish Bank, Ireland, a, side view; 6, apertural 

 view. 



2. Elphidium arclicum (Parker and Jones). X 25. (After H. B. 



Brady.) Arctic, a, side view; b, apertural view. 



3. Elphidiuvi arcticinn (Parker and Jones). (After Dawson.) Gaspe 



Bay. 



4. Elphidium arclicum (Parker and Jones). (After H. B. Brady.) 



Arctic. 

 5, 6. Elphidium arclicum (Parker and Jones). X 50. From Gaspe Bay. 

 a, side view; 6, apertural view. 

 7. Elphidium sibiricum (Goes). (After tj-pe figure.) Arctic, a, side 

 view; b, apertural view. 



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