b LEPTACHATINA. 



Length 10.5, diam. 4.5, length aperture 4.2 mm. ; 7% whorls. 



Length 9.5, diam. 4.1, length aperture 4 mm. ; 7 whorls. 



Length 9, diam. 4, length aperture 3.4 mm. ; 7 whorls. 



Molokai: Sand dunes of Moomomi, Pleistocene (Cooke and 

 Pilsbry). Cotypes in coll. A. N. S. P. and Bishop Museum. 



An abundant and characteristic fossil of the dune-covered 

 deposits, from the shore three-fourths of a mile inland, and 

 about 600 ft. up the bluff. 



The stout, rather prominent columellar lamella and the 

 weaker striation, differentiate this Molokai race from L. oryza 

 of Oahu, not that we would give the impression that the 

 differences are startling. The shape and size vary within 

 wide limits. It is extremely abundant. The surface is usu- 

 ally etched by blowing sand, but perfect shells can be ob- 

 tained in the soft layers of the bluff, and also from the red- 

 dish earth underlying the dunes. 



Want of specimens at hand prevents a comparison with 

 L. isthmica of Maui, which is evidently very close to the 

 Moomomi race, if not the same. 



L. DORMITOR P. & C., n. sp. PL 11, fig. 3. 



The shell is imperforate, cylindric-conic, the upper half 

 tapering to a conspicuously obtuse apex, nearly smooth ; 

 slightly marked with growth-wrinkles, not more strongly 

 striate under the suture. In the best preserved examples a 

 dark brown band borders the suture below. The aperture is 

 rather small, outer lip obtuse, somewhat thickened. Colu- 

 mellar margin sinuous, reflected and adnate, not or but little 

 thickened on the face, passing into a rather thick parietal 

 callus. Columellar lamella emerging conspicuously, and in 

 oblique view thin, but broad and somewhat approaching a 

 horizontal direction. 



Length 9.6, diam. 4.1, aperture 4 mm. ; nearly 7 whorls. 



Length 10, diam. 4.1, aperture 4 mm. ; 7 whorls. 



Length 9, diam. 4.1 mm. 



Molokai : near the top of Mauna Loa, at about 1350 ft. ele- 

 vation, on the south side of the "crater" (Cooke & Pilsbry). 



A Holocene fossil. With much the shape of L. oryza avus, 



