30 LEPTACHATINA, GROUP F. 



with lines of growth. Spire nearly conic with slightly con- 

 vex outlines, apex slightly acute. Suture hardly impressed, 

 faintly margined, slightly crenulate. Whorls 6%, almost 

 flat, increasing regularly, the last nearly cylindrical, tapering 

 towards the 'base, ascending slightly near the lip. Aperture 

 very slightly oblique, slightly diagonal, subovate, somewhat 

 angled at its juncture with the columella. Columella nearly 

 straight, with an acute callus along its face; columellar fold 

 rather strong, oblique, subbasal. Outer lip regularly curved, 

 distinctly thickened within, columellar margin thickened, usu- 

 ally appressed and adnate. Umbilicus, when present, min- 

 ute. Length 8.3, diam. 3.9 ; length of ap. 3.6 mm. 



Oahu: Waianae Mts. back of Leilehua (Oooke). 



A beautiful distinct species found in open country at the 

 base of small ferns. Related to L. vana Sykes, but narrower 

 in proportion to its length and with a less conic spire. There 

 is a larger and lighter-colored variety of this shell of which 

 I have only three specimens. Of this variety a well de- 

 veloped specimen measures, length 9.8, diam. 4.1 mm. 



37. L. OPIPARA n. sp. PI. 12, fig. 1. 



The shell is imperforate, narrowly ovate, corneous, thin, 

 glossy, subdiaphanous, the embryonic whorls smooth, the rest, 

 under a lens, closely and distinctly striate, with numerous 

 very close, and very fine spiral striae. Spire narrowly ovate, 

 apex rounded. Suture faintly margined, crenulate, scarcely 

 impressed, Whorls 6 1 /^ slightly convex, the neanic increasing 

 slowly and regularly, the last increasing more rapidly, nearly 

 cylindrical, tapering towards the base. Aperture large, sub- 

 pyriform, slightly oblique and very slightly diagonal. Colu- 

 mella nearly straight, its face slightly concave, with a rather 

 strong flattened lamella. Outer -margin of lip erect, thick- 

 ened within, nearly flat above, regularly curved below, colu- 

 mellar margin slightly thickened, appressed, adnate. Length 

 9.4, diam. 4.3 ; length of ap. 4.2 mm. 



O-ahu: Apex of mountain range back of Palolo Valley 

 (Cooke). 



L. opipara is most closely related to L. gummed Gulick. It 



