92 LEPTACHATINA, S.-G. ILIKALA. 



117. L. PETILA (Gulick). PL 4, figs. 61 to 64. 



"Shell dextral, perforate, turreted, rather thin, not pol- 

 ished, brown, corneous, obliquely striated; apex somewhat 

 obtuse, pallid; spire turreted; suture simple, well impressed; 

 whorls 6, convex; columella vertical, brown, lightly plaited 

 deep within the aperture; aperture vertical, subelliptical ; 

 peristome simple, with margins joining in an unbroken curve; 

 dextral margin unreflected, arcuate; columellar margin 

 slightly reflected, not appressed ; parietal margin narrow, cal- 

 lous. Length 6.6, diam. 2.8, length of body whorl 3.5 mm." 

 (Gulick.) 



Oahu: Koko, under stones in dry rock regions (Gulick) ; 

 Wailua (Lyman) ; fossil at Nuuanu, Manoa, and at Rocky 

 Hill (Cooke). 



Achatinella petila GULICK, Ann. Lye. N. Y., vi, 1856, p. 

 189, pi. 6, fig. 17. Achatinella fusca NEWCOMB, Ann. Lye. 

 N. Y., vi, 1858, p. 330. Achatinella (Laminella) fusca PFB., 

 Mon. Hel. Viv., vi, p. 181. Leptachatina petila SYKES, P. 

 Malac. Soc. London, iii, 1899, pi. 14, fig. 14; Fauna Haw., ii, 

 1900, p. 367. 



Newcomb, Pfeiffer and Pease seem to have considered this 

 species as identical with L. fusca Newc. It is, however, en- 

 tirely distinct. The specimens collected by Gulick were from 

 Koko Head, a very dry and almost desert region. All my 

 specimens, except the fossil material, was found in the very 

 darkest and dampest valleys of Nuuanu. 



The fossil material from Rocky Hill agrees best with 

 Gulick 's specimens in the collection of the Boston Society. 

 The shells from Nuuanu are imperforate. All my shells are 

 considerably larger than Gulick 's. The measurements are as 

 follows : 



Length 8.6, diam. 3.6, length of apert. 3.1 mm. Waialua. 



Length 7.8, diam. 3.2, length of apert. 2.8 mm. Nuuanu. 



Length 7.9, diam. 2.8, length of apert. 2.6 mm. Rocky Hill. 



