20 LEPTACHATINA, GROUP E. 



der, very thin, shining, transparent, vitreous, scarcely striated 

 beneath the lens ; apex somewhat obtuse ; spire turretly elon- 

 gate; suture simple, scarcely impressed; whorls 6, some- 

 what flattened ; columellar fold slightly developed, termin- 

 ating deep within the aperture; aperture vertical, truncately 

 elliptical; peristome simple, thin, with dextral margin un- 

 reflected, arcuate; columellar margin dilated, thin, vitreous, 

 not appressed; parietal margin wanting. Length 6.3, diam. 

 2.5, length of body whorl 4.0 mm. 



Oahu: Keawaawa, under stones in places not shaded by 

 trees ( Gulick) . 



Achatinella exilis GULICK, Ann. Lye. N. Y., 1856, p. 188, 

 pi. 6, fig. 16. Achatinella (Le^tachatina} exilis PFEIFFER, 

 Mon. Hel. Viv., iv, p. 568; vi, p. 186; viii, p. 247. Lepta- 

 cliatina exilis PEASE, P. Z. S. London, 1869, p. 651. SYKES, 

 Proc. Malac. Soc. London, iii, pi. 14, fig. 18 ; Fauna Haw., 

 ii, 1900, p. 361. 



A small, slender species which does not seem to be very 

 closely related to any other species from Oahu. Its nearest 

 relatives being L. convexiuscula' Sykes, and L. cylindrata 

 Pease, though the two are more closely allied to each other 

 .than is exilis to either of them. Specimens from Gulick 's col- 

 lection are of a brownish corneous color. Mr. Sykes believed 

 that cylindrata and exilis belonged to the same species. From 

 a minute and careful comparison of specimens from both au- 

 thors I am inclined to differ from him. For a discussion of 

 these differences see L. cylindrata. 



A specimen from Mr. Gulick has the following measure- 

 ments: Length 6.1, diam. 2.3, length of apert. 2.35 mm. 

 (pi. 9, fig. 6). 



24. L. SAXATILIS (Gulick). PI. 4, fig. 76. 



"Shell dextral, perforate, cylindrically oblong, thin, shin- 

 ing, transparent, vitreous, microscopically very finely striated; 

 apex rather obtuse ; spire elongate ; suture simple, lightly im- 

 pressed; whorls 6, slightly convex; the last rounded towards 

 the aperture; columella slightly arcuate, pallid, with fold ob- 

 solete; aperture broadly oval; peristome simple, bordered 



