219 



The dorsal aspect of the shell is somewhat similar to that of 

 C. leucostoma, but it is larger, and the base is entirely different. 



Nassa Desmoulioides (Plate IV., fig. i). Shell sub-ovate, 

 anterior rounded, posterior conical, whitish, stained and irregu- 

 larly streaked with brown. Spire acutely conical ; whorls 8, the 

 first 2 smooth polished and regular, the rest convex, rounded, 

 spirally closely lirate, and longitudinally ribbed, the ribs being 

 rounded, and about the same width as the interstices, numbering 

 lo on the penultimate whorl ; the spiral lirae (7 in number) are 

 also rounded and close, becoming here and there slightly nodu- 

 lous on crossing the ribs ; suture concavely impressed. Last 

 whorl roundly inflated, the longitudinal ribs becoming irregular 

 and obsolete, while the spirals (numbering about 16) are rather 

 more distinctly nodulous ; the very short rostrum at the base is 

 somewhat tortuous, and distinctly lirate ; it is defined by a dis- 

 tinctly channeled groove separating it from the rest of the 

 whorl. Aperture sub-ovate ; columella covered by a thin callus, 

 slightly spread upon the midaie of the whorl and forming an 

 erect wall at the side of the umbilical region, with a rather pro- 

 minent obliquely curved plica at the base ; outer lip crenulated 

 at the margin, lirate within ; canal very short, recurved. 



Length 21 ; width 13 millim. 



Operculum thin, corneous, oblong, triangular, serrated with 5 

 projecting cusps on the right and two on the left side. 



Hab. :— Umhloti River Mouth (Natal) bearing N.W. \ 

 VV. ; distant I5|- miles; depth, 100 fathoms. Bottom, sand and 

 shells. 



A pretty shell, having somewhat the form and appearance of a 

 Dcsnioiilea. 



Nassa ANALOGICA (Plate IV., fig. 3). Shell oblong-ovate, 

 yellowish white, banded with light brown. Spire acutely coni- 

 cal, rather long ; whorls 7, slightly convex, spirally regularly 

 grooved, grooves 6 in the penultimate whorl, intervals fiat. Last 

 whorl about ^ the entire length of the shell, slightly inflated. 

 Aperture ovate, slightly expanded towards the front ; interior 

 tinged with pale violet, smooth ; outer lip simple, very little 

 thickened ; columella arched, with a sharp twist at the base, 

 covered with a thin, glossy, transparent callus. 



Length 19; width 10 millim. 



Operculum thin, horny, irregularly triagonal, with the nucleus 

 at the anterior extremity, inclining towards the left. 



Hab. : — Cape Infanta bearing N. | E. ; distant 6^ miles ; 

 depth, 40 fathoms. Bottom, mud. 



This species is nearly allied to N. trifasciata, A. Adams (Plate 

 IV., fig. 2), but the difference in form, as shown by the figures. 



