MvUusca from South Africa. 99 



globular species, ami Iihijtuia Kraussii, PtV.* We have only 

 as yet seen two exniniiics ot this interestinp; mollusk, the first 

 beinjT in the liriti.sh Museum (Natural History). Tiiis is 

 taken as the type. 



IleUcarion asthenes f, t^p. n. (IM. VI. fi^;. 10.) 



H. testa ampla, suborbiculari, Ijeto olivacea, vel rufescenti-cornca, 

 teriui ; spira dcprcsso-conica, teniii ; aniractibus 5, ultimo rapido 

 accrcscente, raafjno, superficie uiuli(pie sericea, paullum nitida 

 (pni^cii)uo ad basin iu statu juveuili) ; apertura lata, ovuli ; 

 peristoniato tt'nuissimo. 



Alt. 13, diam. 21 mm. 



Ilah. Cradock {J. Farquhar). 



A brightly coloured shell, o£ a yellowish or rufous olive, 

 somewhat depressed, thin, effuse ; surface entirely silky, 

 shining only in young examples basally. In size approxi- 

 mating II. fusciculor, M. & P., which is only four- whorled, 

 with slightly iridescent epidermis, and of a peculiar warm 

 sepia coloration. 



TracJii/ci/stis paula, sp. n. (PI. VI. fig. 11.) 



T. testa minuta, urabilicata, depresso-globosa, cornea, tenui ; an- 

 fractibus 4, ventricosis, undiquo longitudinaliter sparsim lirato- 

 plicatis, liris irregularibus, rarius arctis, hie illic rugulosis, 

 obliquis ; apertura rotunda ; peristomate tenui, apud umbilicutn 

 triaiigulatim reflexo. 



Alt. 1, diam. l"7o mm. 



Hah. Johannesburg [J. McBean). 



Very small, with narrow but deep umbilicus, de|>ressedly 

 globose, four-whorlod, the plaited lirte being irregular, 

 obliquely disposed, sometimes wrinkled, and rarely close-set. 

 A few specimens. It seems comparable with T. somerset- 

 erisisy M. & P.J, both of these species being only provisionally 

 lt>caled in the genus Trachijcysfis. 



Traihijcystis rotula, sp. n. (PI. VI. figs. 12, 12(/.) 



T. testa minuta, dcprcssa, profundissime uiabilicata, cornea, delicata, 

 tenui, interne circa basin conccntrice sulcata ; anfractibue 5-6, 



• The opportunity niny bp taken ti mention tliat further comparison 

 of Dorcdfiia in/iluzana, M'. \: P. (Ann. & Mag. Nat. Hist. 18!t4, v<>l. xiv. 

 p. 1»1, pi. i. tig. 4; 18J^6, vol. xv. pi. xii. tigs. H, (J a), with H/iytuia 

 Kramsil, I'fr., convinres us they must, if not varieties of each other, be 

 placed in the same genu3. 



t aadivr)i, from its fragilitv. 



\ .\un. X M.ig. Nat, Hist. "vol. .\i. (1803) p. 10. pi. iii. fig. ;?. 



