160 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 20 



PLATE 3 



Fig. 11. Hormomya adamsiana (Dunker) 1856. Santa Cruz Island. 



Length: 15.8 mm. 

 Fig. 12. Hormomya {/ranulata (Haniey) 1843. Bahia de la Inde- 



pendencia, Peru. Length 11 mm. 

 Fig. 13. Rrachidontes multiformis (Carpenter) 1855. Mazatlan, 



Sinaioa, Mexico. Length: 8.8 mm. 

 Fig. 14. Bradiidontcs puntarnirtisis (Pilsbry and Lowe) 1932. 



Paratype. (Chace collection) Punta Arenas, Golfo de 



Fonseca, Costa Rica. Length: 11.7 mm. 

 Fig. 15. Brachidontes houstonius Bartsch and Rehder 1939. North- 

 east point of Isia Narborough, Galapagos Islands. Length: 



8 mm. 

 Fig. 16. Brachidontes playasensis (Pilsbry and Olsson) 1935. 



Bahia de Santa Elena, Ecuador. Length 8 mm. 



