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



4. Helix (Dorcasi'a) porphyrostoma, sp. n. 



H. testa obtecte umbilicata, conico-pyraraidali, ampla, longitudi- 

 naliter rugoso-striata, pallide cinereo-albescente, solidula ; anfrac- 

 tibus quinque, subconvexis, ultimo rotundato ; apertura ovata, 

 intus purpurea ; peristomate reflexo, purpureo, columella laevi. 



Long. 43, lat, 38 mill. 



Hah. Namaqualand. 



This very fine species is near the well-known H. globulus 

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

 the conically pyramidal shape, the whorls being gradually 

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

 so conspicuous a feature in //. glohulus 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 columellar lips so rich in either sub- 

 stance or colour. 



Two specimens, both precisely similar. There are also 

 unnamed examples in the National Collection. 



5. Helix [Dorcasia) gypsina, sp. n. 



H. testa obtecte umbilicata, globuloso-conica, crassa, longitudinaliter 

 rugoso-striata, calcareo-albcsceute, parum nitente ; anfractibus 

 quiuque, anfractu ultimo compacte rotundato ; apertura depresso- 

 ovali, intus albescente ; peristomate reflexo, albo, margine colu- 

 mellari Isevi, albo. 



Long. 24, lat. 20 mill. 



Hah. Springbok, Africa mer. 



We consider this sufficiently to differ from //. namaquensisj 

 the shell being of decidedly less delicate substance, more 

 compact, and of a chalky whiteness ; the 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) viridescens, sp. n. 



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

 cente, cornea epidermide tccta ; anfractibus tribus, rapide accres- 

 centibus, la3vibus, nitentibus, ultimo magno, subeffuso : apertura 

 lunari-ovata, obliqua; peristomate simplici, tenui. 



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



Hah. Pretoria, Transvaal. 



A small shell, with olivaceous epidermis and of simple 

 character. 



