254 On the Mollusca of Algiers and Bougia. 



Animal yellow with the back and tentacula grey. Allied 

 to Achatina folliculus, but very distinct. The young shell not 

 nearly so ventricose, and the adult much more attenuate. In 

 mossy places and among leaves at Algiers and Bougia. 



SUCCINEA. 



34. Succinea amphibea, Drap. I found dead specimens of 

 this species among the rejectamenta of a rivulet near Algiers. 



Pupa. 



35. Pupa umbilicata, Drap. Among the rejectamenta of 

 the river Haresh. It probably inhabits the mountains of the 

 Lesser Atlas. 



36. Pupa granum, Drap. ? Under stones on Mount Bud- 

 jaria near Algiers, rare. 



Cyclostoma. 



37. Cyclostoma sulcatum, Drap. Common at Bougia. 



Paludina. 



38. Paludina acuta, Drap. In rivulets near Algiers, rare. 



39. Paludina Dupotetiana, nov. sp. PI. XII. fig. 3. 



P. testa minima ovato-conoidea, ventricosa perforata, fusca ; an- 

 fractibus quinis teretibus : apertura ovato-rotunda; spiraobtusa. 



Long. yV ; lat. yV- 



Animal black. The shell is generally encrusted with mud ; 



the operculum is corneous and striated. In muddy rivulets 



near the sea at Algiers and Bougia. I have named this little 



species after Captain Dupotet of the 2nd African Legion, to 



whose kindness I owe many interesting species, and whose 



researches will doubtless throw much light on the zoology of 



French Africa. 



Ancylus. 



40. Ancylus fluviatilis, Drap. Common in rivulets both at 



Algiers and Bougia. 



Physa. 



41. Physa contortajMychSiUdi. In a fountain on the Metidja. 



Planorbis. 



42. Planorbis Metidgensis, nov. sp. PI. XII. fig. 5. 



P. testa albido-cornea, pellucida, irregulariter striata, supra pro- 

 funde umbilicata, subtus plana, anfiractibus tribus. Apertura ro- 

 tundato-lunata, obliqua, subpatula. 



Breadth -^j^ inch. 



