16 LEPTACHATINA, GROUP D. 



L. persubtilis is chiefly characterized by its turrited form, 

 almost flat whorls and the minute striation on the callus of 

 the parietal wall. Some of the specimens have a light brown- 

 ish tinge which is somewhat lighter near the suture. I know 

 of no species to which it may be closely related. 



D. Group of L. gracilis. 

 18. L. GRACILIS (Pfeiffer). PI. 3, figs. 47, 48. 



"Shell, imperf orate, slender, turrited, somewhat solid, 

 nearly smooth, white, encircled with two brown bands ; spire 

 elongate, regularly attenuate, apex somewhat obtuse; suture 

 simple; whorls 8, somewhat flat, the last equal to % of the 

 length, rotundate at the base ; aperture subvertical, sinuately 

 oval; columellar fold median, subeompressed ; lip simple, 

 dextral margin erect, lightly arcuate, columellar margin di- 

 lated, adnate. Length 14.0, diam. 5.5 mm." (Pfr.). 



Oahu: Waianae Mts. ; Kaala (Baldwin); below Kaala 

 (Perkins) ; back of Waialua (Lyman) ; back of Leilehua 

 (Cooke). 



Achatinella gracilis PFEIFFER, P. Z. S., 1855, p. 6, pi. 30, 

 fig. 22. Achatinella elevata Newcomb, PFEIFFER, P. Z. S., 

 1855 (1856), p. 209. Achatinella (Achatinellastrum) gracilis 

 PFEIFFER, Mon. Hel. Viv., iv, p. 536 ; vi, p. 173 ; viii, p. 224. 

 Leptachatina gracilis NEWCOMB, Ann. Lye. N. Y., vi, 1858, p. 

 321. SYKES, Fauna Haw., ii, 1900, p. 363. 



A very distinct elongate species. None of my specimens 

 approach Pfeiffer 's in size. The shells from the western ex- 

 tremity of the Waianae range have a longer and narrower 

 aperture than those from near the middle of the range. 

 Measurements of specimens from these two localities are : 



Length 11.8, diam. 4.7, length of apert. 4.5 mm. (Back of 

 Waialua). 



Length 12.0, diam. 5.3, length of apert, 4.3 mm. (Back of 

 Leilehua) . 



Pfeiffer 's original figure is copied, pi. 3, fig. 48. 



