Quarterly Journal of Conchology. 281 



Buiiminus cosiatus, Gibbons, MS. (PI. III., fig 2). 



Shell slender, elongately-conical, thin, of a liglit opaque brownish 

 color, with distinct, transverse, and slightly oblique ribs ; the 

 zuhorls are lighter colored than the rest of the shell ; epidermis 

 thin; whorls 6-6}4 tumid, flattened, and inflected towards 

 suture, producing a somewhat turrite aspect, gradually increasing 

 in size, the last whorl forming about one-third the length of the 

 shell ; suture broad and deep ; mouth narrow, ovato-elliptical, 

 somewhat contracted and pointed in front ; outer lip thin and 

 direct, long and gently curved ; inner lip short and straight ; 

 columella slightly twisted ; aperture white within and strength- 

 ened by a slight internal thickening ; umbilicus obsolete. 



Length 0.156, breadth 0.062, 

 Hab. Zanzibar. 



Only two dead specimens of this pretty species were found, 

 among dead leaves under trees at Zanzibar. 



Opeas delicata, Gibbojis, MS. (PL III., fig. 3). 

 Animal yellowish. 



Shell conico-turrite, elongate, very thin, semi-transparent, glossy, 

 of a pearly gray color, clouded and rather opaque in places, 

 finely but very distinctly striulate transversely, the striula:; rather 

 curved, with the convexity towards the aperture ; epidermis 

 very thin ; whorls 7-8, rather tumid, rapidly enlarging, especi- 

 ally after the 4th or 5th whorl, the last being much the largest 

 and most tumid ; apex rather obtuse ; suture deep and distinct ; 

 mouth rather narrow, ovate, somewhat oblong, lips almost 

 parallel, outer thin and sinuous, inner very slightly reflected 

 behind anterior end of aperture, ]-ounded ; umbilicus narrow but 

 rather deep. 



Length 0.275, breadth 0.093. 



Hab. Zanzibar. 



