LEPTACHATINA, S.-G. ILIKALA. 89 



ends. Columella straight, white, hardly truncate, furnished 

 with a minute, oblique, deeply situated fold. Outer and 

 lower margin of lip regularly curved, slightly thickened with- 

 in, columellar margin slightly thickened. Umbilicus rimate, 

 with angular margin. Length 7.8, diam. 3.1, length of aper- 

 ture 2.7 mm. 



Kauai: Puukapele, 3000 ft.; Waipo, 3500 ft.; Kumuwela, 

 3800 ft. (Cooke). 



This species is unlike any other from Kauai. The type 

 locality is Puukapele. It is not abundant in any one local- 

 ity, but is probably to be found over all the higher parts of 

 the Island of Kauai. 



L. perforata is provisionally located in Thaanumia, as its 

 embryonic whorls are minutely spirally striate in fresh young 

 specimens. It seems to be an aberrant form. It is possible 

 that L. striata Newc. may be a relative of this species. 



Subgenus ILIKALA n. subgenus. 



The shells are perforate or minutely perforate, elongate 

 with slightly convex outlines, costate; embryonic whorls con- 

 vex, longitudinally costulate, separated by a rather deep and 

 broad suture; columellar fold rather weak, subtransverse. 

 Type L. fusca Newc. 



This subgenus is proposed for three species: fusca, petil-a 

 and fraterna; the first two from Oahu, the last from Kauai. 

 The most important character on which this subgenus is 

 based is the longitudinally costate or distinctly striate em- 

 bryonic shell. Ilikala is probably related to Thaanumia, but 

 the latter has smoother embryonic whorls which are minutely 

 striate spirally, and not axially costulate. (Ilikala, an 

 Hawaiian word meaning a rough skin.) 



115. L. FUSCA (Newcomb). PL 4, figs. 65 to 69. 



"Shell thin, cylindrically elongate; whorls 5, nearly flat; 

 suture linear, slightly impressed; aperture ovate; lip acute; 

 columella dentate within; longitudinal stride strongly de- 

 veloped ; color brown, with a narrow horn-colored band re- 

 volving below each suture ; lower half of the last whorl horn- 



