26 PKOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



about the same width as the riblets ; they are finer and closer together 

 near the aperture. Colour white. Spire sunken. Protoconch very 

 minute, of about one whorl. Whorls 3, regularly increasing, leaving 

 the apex considerably lower than any of the succeeding volutions, the 

 last being the most elevated, and having a rounded periphery; base 

 convex, very broadly and openly umbilicated. Suture strongly im- 

 pressed. Aperture circular. Peristome discontinuous, thin. Columella 

 short, arcuate, not thickened ; the converging margins of the peristome 

 connected by a thin parietal callosity. Umbilicus of the same aspect 

 as the sunken spire. Diam. maj. 2, min. r6 mm. ; height, 0'7 mm. 



Hab. — Near the Snares Islands, in 50 fathoms (Capt. Bollons). 

 A single specimen. Type in my collection. 



11. ClESONELLA DENSILIKATA, n.sp. PI. II, Fig. 13. 



Shell small, turbinate, subdiaphanous, slightly shining, perforated. 

 Sculpture consisting of numerous fine microscopic spiral lira?. Colour 

 white. Spire depressed conoidal, outlines convex, lower than the 

 aperture. Protoconch of two convex, smooth whorls, yellowish-white. 

 Whorls 3J, rapidly increasing, convex, periphery of last whorl rounded ; 

 base convex, with an impressed umbilical area. Suture not much 

 impressed. Aperture circular, oblique, inside microscopically lirate. 

 Peristome continuous, thick. Columella arcuate, slightly expanded 

 towards the narrow perforation, sometimes partly concealing it. 

 Operculum horny, multispiral, nucleus central. Diam. 2-25, height 

 r75 mm. 



Rob. — JS^ear the Snares and Bounty Islands, in 50 fathoms 

 (Capt. Bollons). 



This species is very closely related to the Tasmanian C. Weldii, 

 Ten. -Woods, which, however, is smooth, having a few spiral lirse 

 around the umbilicus only. Type in my collection. 



12. PsEUDOLIOTIA IMPEEEOEATA, U.Sp. PI. II, Fig. 14. 



Shell saiall, globose, imperforate when adult, thick, spirally costate. 

 Sculpture consisting of prominent nodulous ribs, the nodules rather 

 low ; there are two ribs on the penultimate and six on the last whorl ; 

 on the latter a small nodulous rib appears on the last half of the 

 volution close to the suture, followed by four equally strong, equidistant 

 spiral ribs, the interspaces much broader than the ribs ; the whole 

 crossed by fine, close, oblique incremental striae ; a sixth broad rib, 

 more nodulous than the others, forms a semicircle around the stronglj- 

 impressed umbilical area, which is ornamented with distant axial 

 folds. Colour yellowish- white, the spiral ribs maculated with brown. 

 Spire depressed, lower than the aperture. Protoconch white, of 

 two spirally costate flat whorls. Whorls 4, the last large, flattened 

 below the suture, then convex ; base rounded. Suture not impressed. 

 Aperture oblique, nearly circular, white and porcellanous inside. 

 Peristome thick, very little contracted, crenulated on the outside by 

 spiral ribs, regularly convex. Columella arcuate, shining, white, 

 thick ; inner lip spreading over the umbilicus, completely sealing 

 it up, or sometimes leaving a minute chink ; a white callus unites 



