18 SELENOCHLAMYS. 



Canary Islands for mollusks. Wollaston writes of it : " It was 

 both described and figured (in 1819) in i Ferussac 's Histoire Nat- 

 urelle, Mollusques,' as Teneriffan, on the authority of M. d'Or- 

 bigny, who, nevertheless made no sort of allusion to it in his 

 subsequent Canarian catalogue, issued in 1839 ! We are almost 

 driven, therefore, to conclude that d'Orbigny must have had 

 some particular reason for refusing admission to it in the portion 

 of Webb and Berthelot's publication which he undertook to 

 compile ; yet since he ignores the subject altogether, and the 

 diagnosis still remains uncommented upon, and uncancelled, in 

 the great work of Ferussac, I scarcely see how we can exactly 

 pass it over, even though the silence of M. d'Orbigny may ap- 

 pear somewhat ominous as regards its true Teneriffan claims. 



" The most salient character for which the P. Orbignii would 

 seem to be conspicuous (but which appears identical with the 

 main feature of the Testacellas) is the presence of a small ex- 

 ternal Ancylus-like, crotchet-shaped shell, which is carried on 

 the hinder region of the body, at a short distance from the tip, 

 between which and the posterior edge of the shell there is a 

 rough dorsal band. The animal, however, is said distinctly to 

 possess a shield which Testacella does not." Testacea Atlantica, 

 p. 310. 



P. CORNINUS, Bosc. Habitat unknown. 



Probably the figure in Ferussac represents Arion ater with some 

 hardened mucus on its subcaudal gland which has been mistaken 

 for a shell. 



P. COSTATUS, Bosc. (Unfigured.) Maldives. 



Only known from a drawing and description sent by a traveler 

 to Favanne. 



Genus SELENOCHLAMYS, Bottger. 



S. PALLIDA, Bottger. PI. 26, figs. 3, 4. 



Animal resembling Daudebardia, but without a shell ; mantle 

 small, posterior, circumscribed by a sulcus ; respiratory orifice on 

 the right side, and anterior; caudal carina elevated, very short ; 

 sole of the foot narrow, tripartite. 



Length, 13 mill; mantle, *75 mill, long and T5 mill. wide. 



Kutais ( Transcaucasia}. 



