LEPTACHATINA, GROUP F. 33 



with lines of growth. Spire conic, apex somewhat acute. 

 Suture simple, hardly impressed. Whorls 6, nearly flat, the 

 last two increasing rather rapidly, the last subcylindrical, 

 tapering towards the base. Aperture subovate, brownish 

 within, slightly oblique, hardly diagonal. Columella straight? 

 heavily calloused, with a thick white callus along its 

 face; columellar fold small, oblique, deeply situated. 

 Outer lip regularly curved, strongly calloused within and 

 with a broad yellowish white margin without; columellar 

 margin thickened, white, appressed, adnate; both margins 

 united by a rather thick, transparent or whitish callus. 

 Length 8.5, diam. 4.1, length of ap. 3.9 mm. 



Molokai : Pali-ko-i in Halawa and fossil at the mouth of 

 Halawa Valley (Thaanum). 



I know of no species closely related to L. varia. L. corns- 

 cans Hartman is probably its closest relative on Molokai, but 

 the shell -is larger, broader in proportion to its length and 

 thinner. The most distinctive character is the strongly thick- 

 ened margin of the outer lip. This character is also very 

 prominent in L. guttula Gould of Ma.ui. 



There is a lighter colored, yellowish corneous variety. The 

 fossil shells, from the mouth of Halawa, are slightly larger 

 than typical specimens of this species, measuring 9.4 x 4.2 

 mm. A few specimens have a duplicate outer lip. 



42. L. OVATA n. sp. PI. 2, fig. 30. 



The shell is imperforate, ovate, the embryonic whorls 

 greenish corneous, the rest brownish corneous, with a narrow 

 reddish band accompanying the suture, very glossy, very 

 thin, diaphanous, under a lens very minutely striate with 

 lines of growth. Spire ovate, apex obtuse. Suture slightly 

 impressed, faintly margined, minutely crenulate. Whorls 

 nearly 6, slightly convex, the last two slightly swollen, the 

 last large, tapering to the base. Aperture large, about one- 

 half the length of the shell, ovate, slightly oblique, perpendi- 

 cular. Columella slightly oblique, twisted, with a rather 

 strong oblique fold. Outer lip slightly thickened, a little 

 darker than the rest of the shell; columellar margin thin, 

 adnate, length 7.0, diam. 3.6, length of ap. 3.3 mm. 



