50 LEPTACHATINA, GROUP I. 



form ; lip with dextral margin erect, slightly thickened, colu- 

 mellar margin narrow, adnate, parietal margin lacking. 

 Length 8.0, diam. max. 4.0 mm." (Sykes). 



Lanai : mountains behind Koele ( Perkins) . 



Leptachatina semipicta SYKES, Proc. Malac. Soc. London, 

 ii, 1896, p. 128 ; Fauna Haw., ii, p. 369, pi. xi, fig. 12. 



"Most of the specimens have the lower half of the last 

 whorl of a lighter color; some, however, are unicolorous. " 

 (Sykes.) 



Some specimens have a narrow light colored band at the 

 periphery. There are, in Mr. Thaanum's collection, a few 

 elongated specimens. In these, the spire is subcylindrical ; 

 there are 8 slightly convex whorls. One of the shells has the 

 following measurements: length 11.0, diam. 4.2, 1. of ap. 3.7 

 mm. These shells seem to be related to L. longiuscula, especi- 

 ally as the upper whorls are slightly costate. L. longiuscula 

 is, however, more closely related to L. perkinsi. L. semipicta 

 appears at first glance to belong to Thaanumia, but the em- 

 bryonic whorls are not flattened and compressed as in the 

 other species of this subgenus, and I have been unable to find 

 the least trace of minute spiral strias. The original figure is 

 copied in fig. 22. 



J. Group of L. pachystoma. 

 65. L. PACHYSTOMA (Pease). PI. 8, figs. 47, 48. 



' ' Shell dextral, solid, conically ovate, imperf orate, obliquely 

 striate, straw color ; spire elpngately conical, apex subobtuse ; 

 suture scarcely crenulate; whorls 6, somewhat flat, the last 

 more convex, equal to 3/10 of the length; aperture scarcely 

 oblique, elliptical, angulate at both ends ; columellar fold sub- 

 basal, small, thick, callous, oblique, white ; lip continous, with 

 the margins united by a white, 'thick rib-like callus, dextral 

 margin rotundate, callous columellar margin adnate. Length 

 13.0, diam. 7.0 mm." (Pse.) 



Kauai : Haleiele, Makaweli, Halemanu ( Cooke) . 



Labiella pachystoma PEASE, Journ. de Conchyl., xvii, 1869, 

 p. 171. Achatinella (Labiella) pachystoma PFR., Mon. Hel. 



