AMASTBA, MAUI. 281 



the summit. Whorls 6, the embryonic smooth, convex, the 

 rest slightly convex, finely striate, the last whorl inflated at 

 periphery and base, weakly plicate close to the suture, which 

 is thereby made irregular; obtusely angular around the deep 

 umbilicus, which has a spiral gutter just within. The aper- 

 ture is small, angular above, subangular at the base of colu- 

 mella; outer lip slightly thickened within. Columellar lip 

 straight, but little dilated. Columellar lamella small and ob- 

 lique. 



Length 10.9, diam. 6.5, aperture 5 mm. 



Length 10, diam. 6 mm. 



West Maui : Kanaio ( type loc. ) ; Kahului, sand hills in 

 the isthmian region (Baldwin). 



Leptachatina extincta Pfr., in part, BALDWIN, Catalogue, 

 1893, p. 11 (Maui specimens). 



This species is decidedly smaller than A. extincta Pfr., sup- 

 posed to be Oahuan. A. similaris Pse., of Kauai, is very simi- 

 lar, but the embryonic whorls form a much wider, more ob- 

 tuse cone than in A. morticina. A. morticina closely imitates 

 A. umbilicata Pfr., of Molokai, but it differs by having shorter 

 whorls, more distinct striation and a crenulate suture. They 

 probably would not be separated specifically if found on the 

 same island. The apical whorl was omitted by the artist in 

 fig. 8. Only fossil examples have been found and there can 

 be little doubt that the species is extinct. 



The type specimens are of a dull red color (fig. 8) . Others, 

 from Kahului, are white, a little larger, with 6^2 whorls, and 

 the aperture is noticeably more angular at the base. The 

 outer lip is more thickened (fig. 9). Length 12.3, diam. 6.8, 

 aperture 5.7 mm. The largest specimen (labeled West 

 Maui) is 13 mm. long, with 6% whorls. 



Series of A. sphcerica, (p. 147). 

 84. A. OBESA (Newcomb). PL 42, fig. 11. 



" Shell dextral, depressed-conical, inflated, solid, striated, 

 covered with an epidermis of dark umber color; whorls 5, 

 rounded; apex acute; suture simple, well marked; aperture 



