252 Mr. Forbes on the Land and Freshwater 



10. Helix Otthiana, nov. sp. PI. XI. fig. 2. 



Helix orbiculato-depressa, alba, longitudinaliter striata, profunde 

 umbilicata : anfractibus quinque, ultimo carinato marginato ; 

 apertura angulata, peristomate subreflexo ; columella reflexa. 



Breadth 1 inch ; height \. 



Animal very dark grey ; tentacula short, obtuse. On rocks 

 at Bougia, abundant. I have named this very distinct species 

 after my friend and companion in travel Dr. Otth of Berne. 



11. Helix Terverii, Michaud. Animal blueish-grey above 

 with four darker longitudinal stripes ; tentacula blueish-grey. 



On the Chamcerops humilis at Algiers and Bougia in great 

 abundance. 



12. Helix ccespitum, Drap. Algiers, frequent. 



13. Helix pisana, Mull. Algiers, abundant on the aloes 

 near the sea-shore. 



14. Helix variabilis, Drap. Algiers and Bougia, common. 



15. Helix pyramidata, Drap. On Mount Budjaria near 

 Algiers, and at Bougia, plentiful. 



16. Helix conoides, Drap. On the aloes at Algiers. 



17. Helix conica, Drap. Sandy places by the sea at Algiers. 



18. Helix elegans, Drap. At Bougia, abundant. 



19. Helix Rozetti, Michaud. Animal yellowish- white, with 

 four grey longitudinal stripes ; tentacula grey. Under stones 

 on Mount Budjaria. 



20. Helix lenticula, Ferr. Under stones at Algiers and 

 Bougia. 



21. Helix lucida, Drap. Two specimens from the rejecta- 

 menta of the river Haresh, near Algiers. 



22. Helix cellarea, Mull. On old walls at Bougia, a re- 

 markably flattened form. 



23. Helix apicina, Lam. Under stones by the sea at Al- 

 giers. This species is sometimes hairy. 



24. Helix roseo-tincta, nov. sp. PI. XI. fig. 3. 



Helix orbiculato-convexa, depressiuscula, pallide cornea, pellucida, 

 perforata, pilosa, pilis per series longitudinaliter dispositis ; 

 apertura subrotunda, labro interne marginato, roseo-tincto, pe- 

 ristomate simplici ; apice glabro, papillato. 



Br. \ inch ; height T %. 



Var. j3. laevis. 



