non-Marine Mollusca from South Africa. 197 



Trachycystis pycnotricka *, sp. n. 

 ■(PL III. figs. 7-7 h.) 



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

 pellucido-cinerea, epidermide f usca omnino contecta ; anfractibus 

 5-6, paullulum tutnidulis, longitudinaliter arctissime et delicate 

 obliquiliratis, spiraliter minutissime arctistriatis, ultimo apud 

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

 stomato simplici, margiue columellari ad umbilicum fortiter 

 triaugulatim reflexo, 



Alt. 4, diam. 6 mm. 



Hah. Kowie River [Cox). 



The acute keel distinguishes this from the majority of its 

 allies, e. g. T. tricliostiroma and strohilodeSj M. & P. ; iu 

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

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

 elaborate sculpture and the hairj epidermis. 



Trachycystis ectima t, sp. n. 

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



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

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

 cate lougitudinaliter 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 lirae. 



Trochomorpha placenta, sp. n. (PI. 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 

 striatula, anfractu ultimo apud peripheriam acutissime carinato ; 

 apertura subquadrata; peristomate tenui, margine columellari 

 paullum reflexo. 



Alt. 4, diam. 11 mm. 



Hab. 'Nkandhla Forest, Zululand. 



A very remarkable form, unlike any other hitherto recorded 

 from the South-African region. 



* nvKvos, 6p\^, thickly bristled. 

 t fKrinos, select. 



