222 



A strikingly beautiful shell, allied to Turbo henicus, Watson,, 

 from which it differs in detail, chiefly in the sutural channel, and. 

 in the more numerous scale-like spines at the periphery. 



Calliostoma PERFRAGILE (Plate v., fig. 3). Shell trochi- 

 form, very thin, pale iridescent. Spire acutely conical ; whorls 

 7, slightly convex, spirally ridged ; ridges 9 on the penultimate 

 whorl, rather narrow, the upper ones minutely granulated. Last 

 whorl angled at the periphery, with a slight keel, which is arti- 

 culated with rather distant oblong yellowish brown spots ; base 

 rather convex, faintly lirate near the margin, the lirae gradually 

 becoming more prominent towards the centre. Aperture quad- 

 rangular, slightly oblique ; columella very little curved, rather 

 thick, truncated at the base. 



Length 20 ; width 20 millim. 



Hab. : — Vasco de Gama Pk. bearing S. 75'-' E. ; distant 13^ 

 miles; depth, 166 fathoms. Also, Lion's Head bearing N. 

 63° E. ; distant 34 miles; depth, 154 fathoms. 



In form this shell resembles C. ornatum, Lamk., but it is re- 

 markable for its very thin fragile substance. 



Calliostoma (Lischkeia) granoliratum (Plate V., fig: 

 7). Shell angularly conical, width and length nearly equal, 

 white. Spire moderately elevated, almost flatly sloping ; whorls 

 6, plicately laminated, the laminae scarcely discernible on the 

 upper whorls, become more distinct on the lower ; ornamented 

 with small erect, slightly angular nodules m three rows, the twO' 

 upper rows being rather distant, while the lower, just above the 

 suture, is almost close to the middle one, and has much smaller 

 and closer nodules. Last whorl obtusely bi-angular at the 

 periphery, the nodules becoming arched scales ; base rather 

 convex, with 4 prominent rounded lirae, and a fifth narrower one 

 bordering the umbilicus. The lirae are obliquely plicated, so as 

 to give them the resemblance of twisted cords. Umbilicus nar- 

 row, almost covered. Aperture irregularly sub-quadrate, about 

 equal in width and length ; columella margin covered with a 

 thick duplicate callosity forming a ridge against the umbilicus, 

 rather straight in the middle, obliquely arched at the base and 

 continuous with the outer lip. Interior smooth, silvery. 



Length 11 ; width ii^ millim. 



Operculum very thin, round, light, corneous, multispiral. 



Hab. : — Cape Point, False Bay, bearing N.W. by W. ^ W. ; 

 distant y\ miles ; depth, 45 fathoms. 



This beautiful little shell is very like a miniature of C. monili- 

 fcniiii, Lamarck { = Aliciiuv, Lischke), to which Mr. Pilsbrygave 

 the sub-generic name of Lischkeia 



