18 PKOCEEDINGS OF THK MALACOLOGICAL SOCIEXr. 



occasionally terminating in a shoi't bristle ; suture impressed ; 

 umbilicus narrow, deep ; columella outwardly expanded above, 

 descending in an oblique curve, extending into a light, whitish 

 callus which joins the upper margin of the labrum ; labrum simple, 

 acute; aperture obliquely sub-lunate. Alt. 2-5 mm. ; diam. maj. 4'5, 

 min. 4mm. Aperture: alt. 1"75, diam. 175 mm. 

 Hah. — Knysna Forest, Cape Colony. 



TRACHYCrSTIS MICROSTKIATA, n.sp. 



Shell imperforate, tui'binate, thin, semi-transparent, very pale 

 yellowish brown ; whorls 4|^, somewhat shouldered above, regularly 

 increasing, the last convex, sculptured throughout with very fine, 

 closely set, arcuate, transverse striae, crossed by extremely fine, spiral 

 striae, these latter being visible only under the microscope; suture 



impressed, very narrowly margined above ; columella white, almost 

 vertically descending above, then angled and very obliquely descending 

 below ; labrum simple ; aperture broadly sub-lunate. Alt. 3 mm. ; 

 diam. maj. 4*5, min. 4 mm. Aperture: alt. 2o, diara. 1*75 mm. 

 Hah. — Knysna Forest, Cape Colony. 



Tkachtcystis Coxi, n.sp. 

 Shell closely allied to Trachycystis micr-ostriata, but of a pale flesh- 

 colour, marked with dark, radiate, transverse bands ; the upper whorls 

 are rather flattened, not shouldered above, and the sculpture difiers 



entirely in the present species, the transverse striae being much finer 

 and the spirals very much coarser than in T. microstriata. Alt. 3*25 mm. ; 

 diam. maj. 4"5, min. 3'5 mm. Aperture: alt. 2, diam. 1-75 mm. 

 Hah. — Knysna Forest, Cape Colony. 



