non-Marine Mollusca from South Africa. 197 



Trachycystis pycnotricha *, sp. n. 

 ■(PI. III. figs. 7-7 h.) 



T. testa depresso-conica, profunde umbilicata, apice mamillato, laevi, 

 pellucido-cinerea, epidermide fusca omnino contecta ; anfractibus 

 5-6, paullulum tumidulis, loBgitudinaliter arctiBsime et delicate 

 obliquiliratis, spiraliter minutissime arctistriatis, ultimo apud 

 peripheriam acuticarinato, setifero ; apertura ovato-lunari ; peri- 

 stomate simplici, margine columellari ad umbilicum fortiter 

 triangulatim reflexo. 



Alt. 4, diam. 6 mm. 



Uah. Kowie River [Cox). 



The acute keel distinguishes this from the majority of its 

 allies, e. g. T. trichostiroma and strohilodesy M. & P. ; in 

 form it perhaps most calls to mind T. Alcocki, M. & P., from 

 which, however, it is at once distinguished by the more 

 elaborate sculpture and the hairy epidermis. 



Trachycystis ectima f, sp. n. 

 (PI. III. figs. 8, 8 a.) 



T. testa conica, subperforata, tenui, stramineo-cornea, apice tumido ; 

 anfractibus 5, apud suturas impressis, ventricosulis, arete et deli- 

 cate longitudinaliter obliquicostatis, costulis irregularibus ; aper- 

 tura ovato-lunari ; peristomate tenui, regionem apud umbilicarem 

 triangulatim reflexo. 



Alt. 2, diam. 3'50 mm. 



Hob. Umkomaas, Natal [Burnup). 



Very small, but with the aid of a lens this little species is 

 seen to merit the specific title assigned to it, being very deli- 

 cately and closely obliquely ribbed, with somewhat irregularly 

 placed liree. 



Trochomorph a placenta J sp. n. (PL III. fig. 9.) 



T. testa umbilicata, pellucida, tenui, placentiformi, olivaceo-brunnea ; 

 anfractibus 5, supernis compressis, planatis, superficie undique 

 oblique irregulariter lirata, et sub lente spiraliter delicatissime 

 etriatula, anfractu ultimo apud peripheriam acutissime carinato ; 

 apertura subquadrata; peristomate tenui, margine columellari 

 paullum reflexo. 



Alt. 4, diam. 11 mm. 



Hah. 'Nkandhla Forest, Zululand. 



A very remarkable form, unlike any other hitherto recorded 

 from the South-African region. 



* nvKvoi, 6pi^, thickly bristled. 

 t (KTt^os, select. 



