22 LEPTACHATINA, GROUP E. 



The description is based on two specimens one of which, is 

 not adult and is slightly broken. It is' most closely related 

 to L. exilis Gul. from the same island. L. exoptabilis is, how- 

 ever, larger, with less convex outlines and is narrower in pro- 

 portion to its length. I have referred to this species, with 

 some hesitation, a single shell from the Waianae Mts. The 

 shell is larger (length 9.3, diam. 2.8, alt. of ap. 2.9 mm.) y 

 without a perforation and the columellar fold is very minute. 

 It is very glossy and of a very light corneous color. 



26. L. LEIAHIENSIS n. sp. PL 10, figs. 9, 10. 



The shell is imperf orate, elongate, turrited, white (in fossil 

 state), smooth. Spire elongate-turrited, apex rather blunt. 

 Suture simple, hardly impressed. Whorls 6%, increasing re- 

 gularly and very slowly, the embryonic rather large, slightly 

 convex, the rest nearly flat, the last cylindrical with the base 

 slightly flattened. Aperture small, subovate, rather broad 

 in proportion to its length, oblique, slightly diagonal. Colu- 

 mella nearly straight, with a very minute, oblique fold. 

 Outer margin of the lip regularly convex, thickened within, 

 columellar margin thickened, appressed, adnate. Length 6.0 r 

 diam. 2.2 ; length of ap. 2.1 mm. 



Oahu: Diamond Head, fossil (Cooke). 



This species is distinct from all the other species. The 

 turrited blunt spire is very characteristic of this species as 

 is also the oblique aperture. I know of no species with which 

 it may be closely related. It is extremely rare. Less than a 

 dozen specimens were obtained in four trips, two of which 

 were made especially for this species. Of all the specimens 

 collected, only two are now unbroken, and only four were 

 intact when collected, as the shells are very delicate and 

 easily broken in cleaning. 



27. L. MOLOKAIENSIS n. sp. PI. 10, figs. 11, 12. 



The shell is imperforate, elongate, turrited, light brownish 

 corneous, glossy, thin, diaphanous, under a strong lens min- 

 utely striate with lines of growth. Spire elongate, tapering 

 gradually to the rather blunt rounded apex. Suture simple., 



