156 LIMN.ffiAD.ffi. 



Mem. Acad. Bruxelles, vol. xiii. p. 163. — Stein, 



Schnecken Berlins, pi. 2, f. 18. 

 Monstrosities, Helix cochlea, Brown, Mem. Werner. Soc. vol. ii. pt. 2, p. 528, 

 pi. 24, f. 10. — Helix terebra, Turt. Conch. Diction, p. 62, 

 f. 55. — Plan, marginatus, monst. Brown, Illust. Conch. G. B. 

 p. 32, pi. 14, f. 38. 



Shell brownish, or olivaceous horn-colour, usually co- 

 vered with a black or ferruginous coating, not polished, 

 merely a little glossed, moderately depressed (the height of 

 the body, not of the orifice, being for the most part about 

 a fifth, not quite so pellucid as in carinatus, finely, closely, 

 and distinctly wrinkled across, the wrinkles assuming be- 

 neath a powerful lens a somewhat decussated appearance. 

 Upper disk moderately and rather diffusely concave ; 

 lower disk almost flat, but indented in the middle. Whorls 

 five, deeply divided, of moderate increase, not peculiarly 

 narrow, prominently though simply rounded on the upper 

 disk, merely convex on the lower one. Body not so vastly 

 larger than the preceding coil (so that the diameter of the 

 upper internal gyration, measured as in carinatus, greatly 

 exceeds it in breadth), rather wider on the upper disk, 

 about as high as it is broad, with a carinated rim at the 

 periphery that is barely above the basal level ; surface 

 above the keel rather abruptly arched (not shelving), 

 below it almost horizontally convex. Mouth bluntly qua- 

 drant-shaped, of about equal height and breadth. Outer 

 lip acute (more rarely slightly thickened within), dilated 

 above, Avhere it decidedly projects beyond the level, neither 

 peaked nor angulated below, where it scarcely, if at all, 

 exceeds the general level. Breadth of a large individual 

 five-eighths of an inch. 



The keel, which in some examples is continued along 

 the edge of the penult turn, is in others almost altogether 

 obsolete. Tn the variety rhomheus the shell is higher than 



