12 LEPTACHATINA. 



the Maui side (Cooke & Pilsbry). Smuggler's Bay, on the 

 south side (Pilsbry). 



In shells from Diamond Head and Punchbowl the surface 

 is almost smooth, and the columellar lamella is often, but not 

 always, stronger than at Kahuku. Diamond Head specimens 

 vary in size from length 6.25, diam. 2.8 mm., to length 7.8, 

 diam. 3 to 3.1 mm. 



The shells from Moomomi, Molokai, pi. 11, fig. 14, do not 

 seem to differ from the types in striation, but the columellar 

 lamella is perceptibly stronger, as in shells from Diamond 

 Head. It is an abundant species in the dune deposits and on 

 the bluff up to about 600 ft. ; also in the reddish earth of the 

 buried forest-layer. 



Specimens measure : 



Length 7.7, diam. 3.1, aperture 2.8 mm. ; 6% whorls. 



Length 7.3, diam. 3.1, mm. 



Length 6, diam. 2.8 mm. (smallest one noticed). 



On the south side of the "crater" near the treeless summit 

 of Mauna Loa, specimens were found under the stones of 

 aboriginal sweet-potato hills. The shells are fragile from de- 

 cay and are very small, 5.8 mm. long, 2.5 wide, to 5 mm. long, 

 2.3 wide; 5% whorls. Probably the summit of Mauna Loa 

 was the last stand of land shells in the western half of 

 Molokai ; and it seems likely that data fixing the date of last 

 occupation of the peak could be recovered from old natives of 

 Molokai. It is clear that up to that time, Partulina, Amastra 

 and Leptachatina, as well as the smaller snails of other 

 families, still existed there. 



Kahoolawe specimens, pi. 11, figs. 11, 12, 13, are slightly 

 differentiated by their more regular and close striation, and 

 it might not be amiss to distinguish them as a local race. 

 They are usually 7 to 8 mm. long. 



L. subcylindracea is a more slender and elongate shell than 

 L. hyperodon and L. anceyana. It is also more solid, with 

 the parietal callus better developed. 



L. HYPERODON, n. sp. PI. 11, figs. 6, 7. 



The shell is perforate, oblong-conic, grayish yellow, a little 



