Plate 7 



Figures 1 a, 6. Discorhis orbicularis (Terquem), var. selseyensis (Heron-Allen 

 and Earland). X 75. (After Heron-Allen and Earland.) 

 From off Selsey, England, a, dorsal view; b, ventral view. 



2 a-c. Discorbis subaraucana Cushman. X 55. Dry Tortugas, Fla. 

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



Z a-c. Discorbis valvulata id' Orhigny). X 70. Off Pocasset, Buzzards 

 Bay, Mass. a, dorsal view; b, ventral view; c, peripheral 

 view. 



4 a-c. Discorbis candeiana (d'Orbigny). X 75. Off Fowey, Fla. a, 



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



5 a-c. Lamarckina ventricosa (H. B. Brady). X 40. (After H. B. 



Brady.) a, dorsal view; b, ventral view; c, peripheral view. 



6 a-c. Lamarckina scabra (H. B. Brady). X 40. (After H. B. Brady.) 



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



7 a-c. Lamarckina atlantica Cushman, new species. X 40. Oft" 



Fowey, Fla. a, dorsal view; b, ventral view; c, periplieral 

 view. 

 8, 9. Lamarckina haliotidea (Heron- Allen and Earland). a, a, dorsal 

 views; b, b, ventral views; c, c, peripheral views. Fig. 8, 

 Young. X 100. Coast of Belgium. Fig. 9, X 70. Off 

 Faro(^ Islands. 

 152 



