216 



volutions about three, increasing very rapidly in size, the last one 

 being extremely large in proportion to the rest ; spire small, short, 

 obtuse and not raised much above the highest level of the last whorl ; 

 last whorl ventricose and much inflated, especially near and at the 

 mouth, imperforate at the base and marked by a shallowly concave 

 spiral groove or constriction above the middle. Aperture large and 

 wide, nearly circular, but angular at the junction of the outer lip with 

 the inner margin of the mouth ; peristome thin and nearly continuous, 

 interrupted only by the encroachment of a small part of the preceding 

 volution ; inner lip simple, columellar margin devoid of callus, plica- 

 tion, or emargination. 



Surface marked with fine and crowded transverse raised lines, and 

 with pi-ominent and nearly equidistant, transverse rib-like folds. On 

 the last whorl the rib-like plications and raised lines which alternate 

 with them in bundles of from three to five or more, extend from the 

 suture to the base and are not confined to the central and posterior 

 portion of the volution. 



Length, nine millimetres : maximum breadth, about nine and a-half. 



East end of Maud Island, opposite Leading Island: one small but 

 very perfect specimen. 



This shell is possibly a mere variety of Lyosoma Powelli, which 

 differs from the type of that species only in its much smaller size, less 

 regular contour and in the fact that its transverse stria3 and plications 

 cover the whole of the body whorl and are not obsolete on its basal 

 portion. Its greatest diameter is ten mm., while that of L. Powelli is 

 said to be twenty-eight mm. On the other hand the Maud Island 

 specimen almost certainly belongs to the genus Vanikoro of Quoy and 

 Graimard, of which Narica, Recluz, is a synonym. 



AMAUROPSIS TENUISTRIATA, Whiteaves. 

 Plate 28, fig. 3. 



Amauroj)sis tenuistriata, Whiteaves. 1876. This volume, p. 48. pi. 9, figs. 4 



and 4a. 



Shingle Bay, on Moresby Island, one specimen : Bay east of Alliford 

 Bay, nine specimens : South Island, five specimens. "All these locali- 

 ties are in Skidegate Inlet. As the original figure of this- species is 

 not very satisfactory an additional one has been given. 



