22 PKOCEEDINGS OF THE MALA.COLOGICAL SOCIETY. 



sulcata, liris inter jectis supra callum liberum arcuatum ad sinistram 

 contimiis. Long. 57 mm.; diam. maj. 40, min. 32 mm.; apertura intus 

 30 mm. louga, in medio 9 lata. 



Hah. — Kauai, Hawaiian Islands. 



This species is remarkable for the deep sulci, especially upon the two 

 last whorls, and for the flat-topped intervening ridges. These in the 

 penultimate whorl are six in number, and in the last there are nine- 

 teen, those upon the lower half of the whorl being less flattened than 

 those above. The body- whorl exhibits one varix besides the labrum, 

 the penultimate has one varix, and the antepenultimate two varices. 

 The sulci within the aperture extend over the thickened labrum 

 almost to the outer edge, and the intervening ridges are very peculiarly 

 indented. The transverse sulci upon the columella are very deeply 

 cut in, the ridges between them consequently being very conspicuous. 

 They are produced upon the free callus on the left of the aperture. 

 This callosity has a curved outline, is united above with the outer lip, 

 the contour of both together being of an ovate form. There does not 

 appear to be any species very closely allied to the present form with 

 which to suggest a comparison. 



