MOLLUSCA OF SOUTH AFIUCA 



G. B. SOWERBY, F.L.S. 



Since writing my short paper, published in " Marine Investiga- 

 tions of South Africa," 1902, a quantity of additional material has 

 come to hand, which I have carefully examined. Most of the 

 Mollusca I have identified, a large proportion needing no special 

 comment. The 25 species herein described I believe to be new 

 to science ; and following these descriptions I have appended 

 notes on a few species little known, of special interest, or hither- 

 to inadequately described, giving figures in the accompanying 

 plates of such as have not hitherto been figured. In recording 

 the results of my investigations, I have gratefully to acknowledge 

 the valuable assistance of Messrs. S. Pace, E. A. Smith, and 

 E. R. Sykes. 



Mr. Pace has examined the animal and radula of Sipho 

 pyrrhostoma of Watson, finding that it does not belong to the 

 Fustdce, but to the Volutidce, so that I have placed it in my 

 genus Neptuneo ps is, of which N. Gilchristi is the type. 



The soft parts of some of the other species are still reserved for 

 examination, and will be reported on later. 



New Species. 



Pleurotoma (Surcula) lobata (Plate IV., fig. 9). Shell 

 iclongately fusiform, posterior long, anterior short, yellow i 

 white. Spire elongately turreted, slightly convex at the sides 

 whorls 10; slightly angular, ornamented at the angle by a row 

 of small rounded prominent tubercles, numbering 13 on the 

 penultimate whorl ; a sharpish keel borders the whorls at the 

 upper part, between which and the angle a faint thread-hke ridge 

 is discernible. Last whorl shorter than the spire, with a double 

 keel below the periphery which terminates in a remarkable de- 

 flexed tube-like projection, forming "a lobe to the aperture ; base 

 conspicuously Urate ; rostrum short, slightly recurved. Aperture 

 moderate ; columella rather straight above, slightly tortuous at 

 the base, covered with a thin, smooth laminar callus ; outer lip 

 thin, with a broad shallow sinus at the posterior angle, in addi- 



