DESCRIPTIONS OF TWO NEW SPECIES OF MARGINELLA 

 FROM SOUTH AFRICA. 



By J. R. LE B. TOMLIN, M.A. 



(Read Ijefore the Society, September loth, 1913). 



Marginalia pachista n.sp. — 



Shell ovate-oblong, solid, smooth, polished, pinkish-brown in 

 colour, generally with a broad rather indistinct whitish zone on the 

 last whorl below the suture ; last whorl shouldered ; spire blunt ; 

 whorls 4^ in number; suture fairly well marked; aperture rather 

 broad, tinged with pink inside ; columella nearly straight, with four 

 strong plaits ; lip very strongly thickened, sinuate above, so as to 

 form a distinct sinus at the top of the aperture and a sort of denti- 

 form excrescence on the labrum, considerably curved, simple within, 

 white in colour with numerous pink spiral lines, which never seem 

 to reach the inner side of the labrum and vary in number and 

 intensity. 



^Iargi)iella pachista. 



Size : — Alt. i4"5 mm. ; diam. max., 8 mm. 



Hab. : — East London & Umkomaas (Burnup); Tongaat (Alexander). 



This species greatly resembles M. vexiUum Redf. from West Africa, 

 but the latter has the lip denticulate within and a much narrower 

 aperture and canal. They have the same thickened, lineolate lip, but 

 M. pachista is rather longer and narrower in form. It sometimes 

 has a row of minute, distant brown dots on the last two whorls, and 

 a second row on the last whorl, starting from the uppermost colum- 

 ellar plait. The type has a very small subsidiary plait on the 

 columella, between the first and second plaits, but this appears to be 

 accidental. 



Marginella aphanospira n.sp. — 



A small white, semitransparent species of the Persicula section ; 

 shell ovuliform, without spire ; columella strongly convex above and 

 concave below with two plaits ; labrum slightly thickened, rising dis- 

 tinctly above the plane of the apex of the shell ; aperture strongly 



