Plate 5 



Figures 1 a-c. Dtscorbis mamilla (Williamson). (After Williamson.) a, dor- 

 sal view; h, ventral view; c, peripheral view. 



2 a-c. Discorhis mediterranensis (d'Orbigny). (After Heron-Allen and 



Earland.) Clare Island Region, Ireland, a, dorsal view; 6, 

 ventral view; c, periplieral view. 



3 a-c. Discorhis millettii (Wright). (After Wright.) n, dorsal view; 



b, ventral view; c, perij^heral view. 



4 a-c. Discorhis millettii (Wright). X 100. Coast of Belgium, a, 



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

 5, 6. Discorhis mira Cushman. X 75. Montego Bay, Jamaica, a, 

 dorsal view; h, ventral view; r, i)eripl'.eral view. 

 150 



