238 Messrs. J. C. Melvill and J. H. Ponsonby on 



4. Helix [Dorcasia) porphrjrostoma, sp. n. 



//. testa obtecte umbilicata, conico-pyramidali, ampla, longitudi- 

 nalitor riigoso-striata, pallule cinerco-albescente, solidula ; anfrac- 

 tibus quinque, subconvexis, ultimo rotuadato ; apcrtura ovata, 

 iiitus purpurea ; peristomatc reflexo, purpureo, columella laevi. 



Long. 43, lat. 38 mill. 



Hah. Namaqualancl. 



Tills very fine species Is near the well-known IT. globulus 

 (MiilL), from which, however, and all near allies it differs in 

 the conically pyramidal shape, tlie whorls being gradually 

 attenuate towards the apex. There is no sign of malleation, 

 so conspicuous a feature in //. globulus and rosacea in all their 

 forms ; and, lastly, the outer lip is more simple, being not so 

 conspicuously reflected, nor is the deposit of purple enamel 

 both on the outer and columcllar lips so rich in cither sub- 

 stance or colour. 



Two specimens, both precisely similar. There arc also 

 unnamed examples in the National Collection. 



5. Helix (Dorcasia) gypsina^ sp. n. 



//. testa obtecte umbilicata, globuloso-couica, crassa, longitudiualiter 

 rugoso-striata, calcarco-albesceutc, pariim nitente ; aafractibus 

 quiuque, anfi'actu ultimo com]iacte rotuudato ; apertura dcprcsso- 

 ovali, intus albescente ; peristomatc reilexo, albo, marginc colu- 

 mellari la)vi, albo. 



Long. 24, lat. 20 mill. 



Hab. Springbok, Africa mer. 



We consider this sufficiently to differ from //. namaquensis^ 

 the shell being of decidedly less delicate substance, more 

 compact, and of a chalky whiteness ; tiie mouth less effuse and 

 distinctly ovate-depressed at the base. It is also consider- 

 ably smaller ; nor is the slight malleation, so noticeable in 

 the last whorl of that species, to be found in H. gypsina. 



6. Helix {Patula) inridescenSy sp. n. 



H. testa profuude lato-umbilicata, tenui, planato-depressa, albes- 

 cente, cornea epidermide tecta : uufractibus tribus, nipide accres- 

 ccutibus, lasvibus, uiteutibus, ultimo magno, sxibotfuso : apertura 

 lunari-ovata, obliqua ; periatoniato simplici, touui. 



Long. 5 mill. spec, majoris, lat. 2 mill. 



Hab. Pretoria, Transvaal. 



A small shell, with olivaceous epidermis and of simple 

 character. 



