ODOSTOMIA. 119 



at the inner bases of the tentacles, not very close together : 

 foot flexible, more or less concave in front, with longish au- 

 ricles, below which it is gradually constricted ; the margins 

 are thin, and often folded upwards ; it is either bluntly or 

 sharply pointed behind ; when the animal is in motion there 

 is on each side of the foot a marginal series of about eight 

 very minute glossy points. Animal very active and free. 

 (Clark.) 



SHELL nearly cylindrical, with a rounded and produced base, 

 t)hin, transparent and polished : sculpture, extremely fine and 

 close -set longitudinal strias, which can only be detected by 

 the aid of the microscope and in certain lights : colour clear 

 white : spire turreted, and apparently truncated at the point, 

 which is rounded and inverted : whorls 4-5, rather convex, 

 although compressed and gradually enlarging ; the last two 

 are almost equal in breadth, and the body-whorl somewhat 

 exceeds in length the rest of the spire : suture nearly straight, 

 slightly channelled above ; it is defined on the under side by a 

 narrow rim, arising from the double layer of shell in that part, 

 the upper edge of the lower whorl being soldered on the peri- 

 phery of the preceding whorl : mouth oval, expanded below ; 

 it occupies about one-third of the shell : outer lip rounded but 

 not prominent, contracted and somewhat sharply inflated above, 

 just below the periphery: inner lip not perceptible on the 

 upper slope of the base, slightly reflected and but little curved 

 below: umbilicus very small and narrow, but distinct: tooth 

 or fold inconspicuous or scarcely discernible : operculum thin, 



finely striated. L. 0-08. B. 0-04. , - 



leit^iHr J **!*% 



HABITAT : Dredged off Teigrimouth (Clark) ; Torbay 

 (Battersby and J. G. J.) ; Brixham (Hanley) ; Ply- 

 mouth (Barlee) ; other parts of south Devon (Webster); 

 Hebrides (Barlee and J. G. J.) . It is rare, and occurs 

 in muddy sand, between 6 and 50 f. Loven discovered 

 it on the coast of Sweden, in mud, among Pennatul& } at 

 a depth of 30 f. On reexamining his description and a 

 specimen with which he favoured me, I observe that the 

 whorls are more convex, and the suture consequently 

 deeper, than in our shell; but such characters perhaps 

 vary in this as they do in other species of Odostomia. 



