﻿24 (t. and H. Nevill — On New Marine Mollusca. [No. 1, 



the interstices transvei^ely, rather distantly and very regularly ridged ; 

 white, with a double row of bright brown granules on the 5th and 6th 

 whorls, with three of the same double rows on the last whorl ; outer lip 

 thickened, very regularly ridged, columellar margin reflected and ridged, 

 aperture very straight, with a very small notch at the top. 



Long. 7 Mil., Diam. 3 Mil. 



Mauritius. 



MiTRA (Pusia) Ceeis-ica, n. sp., PL I. Fig. 9. 



Shell small, stout, glabrous ; whorls eight, obtusely rounded, apex de- 

 collated, longitudinally, somewhat indistinctly plicately ribbed, ribs smooth, 

 wide, close together, in the interstices transversely minutely striated, sculp- 

 ture altogether obsolete on the back of the last whorl ; colour rich chesnut- 

 brown, with a moderately broad white band round the middle of the last 

 whorl, ornamented in its centre with a row of square, distant, regular brown 

 spots, this white band can be traced indistinctly near the suture of the upper 

 whorls ; interior of the aperture prominently ridged, columella five-plaited. 



Seven or eight specimens of this pretty species have come under our 

 notice, its nearest ally seems to be M. pardalis, Kiist. 



Long. 12i Mil., Diam. 5^ Mil. 



Mauritius. 



Nassa (Hima) sisteoidea, n. sp., PI. I. Fig. 6, 

 Shell fusiformly ovate, thick, yellowish-brown, with a narrow black belt 

 just above the suture, and a second broader one in the centre of the last 

 whorl ; whorls five to six, depressed into a sort of groove next the suture, 

 obliquely rather closely longitudinally ribbed, entire surface spirally ridged 

 with white, forming small, somewhat indistinct, white granules where the 

 ridges cross the longitudinal ribs ; inner lip with the callus defined, of a 

 deep mauve colour, with three plaits at the base : outer lip simple, strongly 

 varicose, interior a deep mauve colour, irregularly ridged with white near 

 the margin and with a single white zone near the centre ; operculum typi- 

 cal. Totally unlike both in form and colour the other species of the genus 

 in these seas, it has some analogy with certain species of Sistrum. 

 Long. 17 Mil., Diam. 11 Mil. 

 Andamans. (Coll. Eev. J. Warneford,Dr. Stoliczka and Indian Museum). 



Nassa (Telasco) Stoliczkana, n. sp., PI. I. Fig. 8. 

 There is only one species of the genus that at all resembles this inter- 

 esting form, viz., N. semiplicata, A. Ad. (China, Benson) numerous speci- 

 mens of which we have seen in all stages of growth from Madagascar, Mau- 

 ritius, Ceylon, and Arakan ; the shell here described is considerably smaller, 

 more regularly and closely longitudinally ribbed, the interior more richly 

 stained with brown, the last whorl sculptured with incised, transverse lines 



