1885.] FROM THE SOLOMON ISLANDS. 589 



Solomon Islands, has also been collected further north than Ugi, on 

 San Christoval and Guadalcanar, by Macgillivray. 



2. Helix (Nanina) nitidissima. (Plate XXXVI. figs. 1, 15.) 



Shell thin, transparent, very glossy, depressed, narrowly perforate, 

 pale brownish horn-colour above, whitish towards the umbilicus, 

 sculptured with very faint lines of growth. Whorls 4-5, slightly 

 convex, impressed and niarginate above at the suture; last whorl 

 large, rounded at the periphery. Aperture obliquely lunate ; peri- 

 stome simple, thin, slightly thickened and reflexed partly over the 

 perforation. Spire low, but very little raised above the last whorl, 

 obtuse at the apex. Greatest diameter 14 nnllim., smallest 12 ; 

 height 9. 



Hab. Treasury Island, Bougainville Straits. 



Nayiina casca of Gould, from the Fiji Islands, is very like this 

 species, but has more slowly increasing whorls : the last is propor- 

 tionally smaller than in //. (JS'anina) nitidissima. 



Two specimens from Guadalcanar Island, collected by J. Macgil- 

 livray during the voyage of H.M.S. ' Herald,' and presented by him 

 to the British Museum, may be considered as referable to a variety 

 of this species, having the spire somewhat more elevated and the 

 body-whorl a little more globose. 



.3. Hklix (Nanina) solidiuscula. (Plate XXXVI. figs. 2, 

 2 b.) 



Shell very narrowly perforate, depressed, somewhat solid, dark 

 chestnut-brown and a little glossy above, more shining and paler 

 beneath, becoming almost white at the umbilical region ; whorls 6j, 

 convex, separated by a deepish suture, and, with the exception of two 

 or three at the apex which are smooth, sculptured with strong, close- 

 set, arcuate, and oblique striae on the upper surface, crossed with a 

 few more or less distinct spiral lines. Body-whorl rounded at the 

 jieriphery, or sometimes with the faintest indication of an angle, 

 convex, and only exhibiting fine lines of growth below. Aperture 

 obliquely semi-lunate ; peristome simple, but, owing to the solidity 

 of the shell, seeming slightly thickened, especially on the very oblique 

 columellar margin, which is shortly reflexed above over the perfora- 

 tion. Spire depressed-conoid, having the least convex outlines and 

 an obtuse apex. Greatest diameter 18 millim., smallest 1()|, height 

 12; aperture 8 long, 4| wide. 



Hab. Santa Anna Islands, "living generally on the trunks of 

 cocoa-nut palms" {Gupj)y). 



This species is well distinguished by its comparative solidity and 

 strong sculpture on the upper surface. 



4. Helix (Corasia) tricolor, Pfeiffer. (Plate XXXA^I. figs. 

 3, 3 5.) 



This species was described originally from specimens collected at 

 the island of San Christoval ; it was obtained at Ugi or Gulf 



