TORNATELLIDES. 



T. macromphala, all the islands except Niihau. 



T. procerulus, all the islands except Niihau and Kahoolawe, 

 but with some racial variation. 



T. perkinsi acicula, Oahu, Molokai, Lanai, Maui. 



T. tcrebra, Molokai, Lanai, Maui, Hawaii. 



A few others occur in slightly varying forms on two islands, 

 and with increasing collections the number of species common 

 to more than one island is likely to be considerably augmented. 

 Each Hawaiian island has several species special to it, and the 

 number of these will undoubtedly be increased also. Almost 

 <every new exploration contains unknown species of Tornatel- 

 lides. It will be one of the largest Hawaiian genera. 



Tornatellides is the only genus of the family yet found in 

 the Galapagos Islands; and it is the only land snail of that 

 fauna, as at present known, having Polynesian affinities. All 

 the rest of the known snails are distinctly American. 



Key to Groups of Tornatellides. 

 NOTE. The keys are applicable to adult shells only. 

 a. Surface sculptured with irregular ribs or riblets. 



b. Whorls convex, the last having a spiral sulcus (Sub- 

 genus Waimea). T. rudicostatns, no. 54. 

 &'. Whorls flattened. T. insignis, no. 26. 

 a\ Surface smooth. 



fo. Parietal lamella entire. 



c. Base abrupt, subtruucate ; umbilicus large. 



Group of T. perkinsi, p. 223. 

 c 1 . Base not abrupt or truncate. 



d. Whorls convex ; base rounded. 



e. Columella without lamellae or folds 

 in adults. 



/. Neanic stage having a single 

 columellar lamella or none. 

 Group of T. simplex, p. 195. 

 /'. Neanic stage having two dis- 

 tinct columellar lamellae. 

 Group of T. euryomphala, 

 species nos. 38, 40, 42, 48. 



