Molhsca of Algiers and Bougia. 253 



Animal (of both varieties) slender, yellowish-grey ; upper 

 tentacula slender, dark towards the apex ; lower tentacula 

 grey ; tail acute. On rocks near Algiers, and. on walls at 

 Bougia. 



BULIMUS. 



25. Bulimus decollaf us, Drap. Not rare at Algiers. Com- 

 mon at Bougia ; at Monkey mountain near Bougia the cre- 

 vices of the rocks are often filled with broken shells of this spe- 

 cies and Achatina Poireti, perhaps collected by the monkeys 

 for food. The Bulimus decollatus grows to a much larger 

 size in North Africa than in Europe. I have specimens an 

 inch and a half long. 



26. Bulimus acutus, Drap. Common at Algiers and Bougia. 



27. Bulimus ventricosus, Drap. In moist places on the plain 

 of the Metidja, but not so frequent as the last species. 



28. Bulimus pupa, Farr. Common at Algiers. The ani- 

 mal is of a uniform dark grey colour. 



29. Bulimus Terverii, Dupotet, PI. XII. fig. 1. MSS. A 

 very distinct and interesting species discovered near Bougia 

 by Capt. Dupotet, and named by him after M. Terver of 

 Lyons. In form it connects Bulimus acutus with Bulimus 

 obscurus and montanus. Its colour is corneous with white 

 irregular longitudinal stripes. I have taken it from the sur- 

 face of rocks at Mount Goriah near Bougia. 



Achatina. 



30. Achatina Poireti, Ferr. (A. algira, Philippi ; Bulimus 

 algirus, Brugi^re.) Rare at Algiers ; more frequent at Bou- 

 gia. The animal is of a bright orange colour. 



31. Achatina acicula, Lam. Among the rejectamenta of 

 the river Haresh. 



32. Achatina follicula, Lam. Frequent at Algiers, under 

 stones, in dry places. Animal yellow with the upper ten- 

 tacula and two longitudinal stripes on the back dark grey. 



33. Achatina nitidissima, nov. sp. PI. XII. fig. 2. 

 Achatina testa cylindracea, pellucida, Isevissima, nitidissima, cor- 



neo-lutescente : apertura oblonga : anfractibus quiuis, ultimo 

 majore : apice obtuso. 

 Length ^. 



