326 ABIDA. 



Pupa (Torqullla) obliqua G. NEVILL, P. Z. S., 1880, p. 126, 

 pi. 13, f . 4. 



A rather rare species, from deposits B. and F only; M. 

 Bourguignat informs me he possesses numerous recent speci- 

 mens from the "Plateau glace de Meaille, Dept. Basses- 

 Alpes." I should have ranked this subfossil form as a re- 

 markable dwarf variety of P. midtidentata, but for the con- 

 stant and characteristic difference in the prominent palatal 

 fold, which is always more or less semicircularly and markedly 

 curved or rounded in all the forms I know of P. midtidentata; 

 in my neAV species this fold ascends the aperture without any 

 deflection or curve whatever; the parietal fold is also dis- 

 tinctly straighter and less prominently produced, the colu- 

 mellar margin not being in the least convex, as well as dis- 

 tinctly angulate at base, seems also a constant character. The 

 present form is nearer the wonderfully produced and turric- 

 ulate var. polita of Risso than typical P. midtidentata (Nevill) . 



One of the two forms of variabilis named by Bourguignat 

 from the plateau of Meaille may be identical with this. 

 Caziot, in his volume on the land and fresh-water mollusks of 

 Monaco (p. 324) notes that it occurs living on the Var and 

 in the Basses-Alpes, at Meailles near Annot, but that it is 

 nothing but an individual variation of the very polymorphic 

 Pupa variabilis. 



A. variabilis has sometimes been identified with Turbo multi- 

 dentatus Olivi, Zoologia Adriatica, 1792, p. 171, pi. 5, f. 2, 

 said to be found in debris of our coast (the Italian shore of 

 the Adriatic). The figures indicate a shell having 10 or 12 

 whorls, about 17 mm. long, if of natural size. This agrees 

 better with A. variabilis polita of the Riviera than with any 

 other known form. However, as the description and figures 

 are very poor, the name has generally been discarded. 



A. variabilis polita (Risso). PI. 45, fig. 16. 



Shell very glossy, shining, translucent, very abruptly ter- 

 minated above ; whorls 12, sculptured with very fine, oblique, 

 somewhat curved striae ; suture deep ; epidermis corneous ; 

 peristome ivory-white, on the right and posteriorly armed: 

 with two lamelliform teeth. Length 14 mrn. (Risso}. 



