LEPTACHATESTA, GROUP O. 73 



Oahu and L. fraterna from Kauai. It differs from the 

 former in having a much larger umbilicus, less convex whorls 

 and the embryonic whorls are not striate. 



In L. fraterna the umbilicus is smaller, the shell larger, the 

 embryonic whorls costulate, etc. 



96. L. LEUCOCHILA (Gulick). PL 7, figs. 33 to 38. 



" Shell dextral, imperf orate, ovately turrited, shining, 

 semipellucid, corneous, with crowded longitudinal striae; 

 apex obtuse; spire turrited; suture finely margined, moder- 

 ately impressed; whorls 7-8, somewhat convex; columellar 

 fold sub-basal, white; aperture sinuately pyriform; peris- 

 tome pallid, with slight callous thickening; dextral margin 

 unreflected, arcuate ; columellar margin dilated, white, adnate ; 

 parietal margin very thin, corneous. Length 11.0, diam. 4.8, 

 length of body whorl 6.6 mm." (Gul.). 



Kauai : Milolii, Waipo ( Cooke) . 



Achatinella leucochila GULICK, Ann. Lye. N. Y., vi, 1856, 

 p. 173, pi. 6, fig. 1. Leptachatina leucochila SYKES, P. Malac. 

 Soc. London, iii, pi. 4, fig. 12 ; Fauna Haw., ii, Moll., p. 365. 

 Achatinella pyramis NEWCOMB, Ann. Lye. N. Y., vi, 1858, 

 p. 319. Achatinella (Leptachatina) pyramis PFEIFFER, Mon. 

 Hel. Viv., vi, p. 184. 



This species is closely related to L. balteata Pse. The sur- 

 face is, however, more glossy and the embryonic whorls are 

 not as compressed as in Pease's species. In all the speci- 

 mens referred to his species there is an additional columellar 

 fold, which is more oblique and deeply situated than the 

 usual fold. This fold is just above the latter, with which 

 it forms a very acute angle. The additional fold is easily 

 seen in specimens which have the columella exposed. This 

 is the only species in which the duplication of the columellar 

 fold has been observed. 



The shells referred to this species agree closely with shells 

 from Gulick, except that the costae are slightly further apart 

 and the additional columellar fold is more prominent. 



One of Cnlick's shells has the following measurements: 

 length 11.4, diam. 5.3, length of aperture 5.1 mm. 



