Mollusca of Algiers and Bougia, 251 



Of the shells enumerated in M. MichaucPs Catalogue, I be- 

 lieve the following do not occur either in the province of 

 Titerie (Algiers) or in that of Constantine. Helix cariosula, 

 soluta, alabastrites, and Hieroglyphicula (all new species of 

 M. Michaud), Helix vermiculata, Carthusiana, albella, zaphi- 

 rina, and conspurcata. Bulimus radiatus, Cyclostoma Voltzi- 

 anum (new) an&ferrugineum (new). 



Among the forty-five species collected by myself, there are 

 several which I have reason, after careful research, to believe 

 undescribed, and have accordingly given them names except 

 in the case of two species of Limax. 



LlMAX. 



1. Limax cinereus. Gardens near Algiers. 



2. Limax , with the body rounded, head and tentacula 



purple-grey, the back with two dark parallel stripes. Shield 

 yellowish-grey, with two dark longitudinal stripes, not conti- 

 nuous with those of the body. Length, an inch and a half. 

 At Bougia and on the hill of Budjaria near Algiers. 



3. Limax , with the back sharply carinate, grey ; ten- 

 tacula dusky; shield brownish- white, with grey markings. 

 Length, one inch. At Bougia, rare. 



Helix, 



4. Helix aspersa, Mull. Common at Algiers and Bougia. 

 The colouring of the shell generally more vivid than in the 

 European specimens and the size greater. 



5. Helix melanostoma, Drap. Algiers, rare. 



6. Helix nalicoides, Drap. Not common at Algiers. Fre- 

 quent at Bougia, where it abounds on nettles, coming out 

 from its retreat after a shower of rain. Grows to a larger size 

 than in Europe. 



7. Helix lactea. Mull. Thickets about Algiers ; common. 



8. Helix Constantina, nov. sp. PL XI. fig. 1. 



H. testa subglobosa, imperforata, alba, rufo-fasciata ; fauce alba : 



labro expanso, margine reflexo ; columella gibba. 

 Animal purplish-grey; foot yellowish- white ; tentacula long, 

 slender. In waste places among nettles at Bougia. 



9. Helix candidissima, Drap. On the hill of Budjaria near 

 Algiers, abundant. 



