14 LEPTACHATINA. 



Cooke). It extends the whole length of the Waianae range, 

 on ridges of the northern side. 



Section ILIKALA Cooke. 

 L. PETILA (Gulick). PL 9, figs. 5, 6, 7, 8. 



Vol. XXI, p. 92, pi. 11, fig. 9. In the type lot from Koko 

 Head the color is pale yellowish brown (cinnamon-buff). 

 Surface dull. First whorl smooth, the next with fine, close 

 axial strias. The later whorls have thread-like stria;, unequal 

 and unevenly spaced, but fine and close. The outer lip is 

 obtuse. Columellar fold small and strongly oblique, hardly 

 visible in a front view. Parietal callus noticeably thickened 

 at the edge. Length 6.6 to 6.8 mm. 



Oahu : Koko and Keawaawa (Gulick). Fossil at Kaelepulu, 

 Kailua, in pockets of a calcareous sand-rock bluff, about y 

 mile from the sea (Pilsbry). 



The specimens from Keawaawa (pi. 9, figs. 7, 8) are like 

 the types from Koko. In the fossil deposit on the Kailua 

 peneplain the shells are a trifle larger, up to 7.2 mm. long, 

 and the columellar lamella is obsolete, represented by a slight 

 swelling only (pi. 9, figs. 5, 6). The strife are unequal, and 

 usually in groups. 



L. petila is a dry-country species, very likely derived from 

 the following humid zone form. It belongs to the rapidly 

 disappearing low country fauna. 



L. NEMATOGLYPTA Pilsbry & Cooke, u. sp. PL 9, figs. 9, 10. 



The shell is narrowly perforate, turrite, rather thin, chest- 

 nut brown or auburn. First whorl smooth, the next very 

 delicately striate axially. Later whorls have thread-like 

 stride, unequal and unevenly spaced, often twinned or in 

 groups of three. The whorls are strongly convex and parted 

 by a well impressed suture. Outer lip thin. Columella dis- 

 tinctly truncate in a front view, having a strongly oblique 

 but rather small lamella. Parietal callus very thin. Length 

 8.7, diarn. 4 mm. ; aperture 3.25 mm. ; 7 whorls. 



Oahu: Kawailoa (Gulick) ; Halawa (Thaanum, type loc.) ; 



