THE LAND AXD FRESHWATER MOLLUSCA OF DORSETSHIRE. 93 



Var. acuta. Body of a greyish colour and closely covered 

 with black spots. Shell smaller than the typical form, more oblong, 

 and having the last whorl and mouth proportionably narrow, 

 Limnceus acutus, Jeffr. in Linn. Iran., xvi., p. 373. Limnaus 

 auricularius, var. F. and H, iv., p. 171, pi. cxxiii., f . 2. 



Hab. Marshes, slow rivers, deep ditches and large ponds. 

 Var. Weymouth (Damon). 



Not so common as the last, but generally distributed. Mr. 

 Gwyn Jeffreys says : " It is apt to be infested, as well as its 

 congeners, by an. annelid allied to the Nais vermicularis of Miiller, 

 which usually takes up its abode between the neck and mantle, 

 aud over the tentacles of the mollusc, incessantly vibrating, 

 and apparently not parasitic but feeding on animalcules." Brit t 

 Conch., vol. 1, p. 109. 



4. L. STAGNALIS, Linn., pi. 7. 



HELIX STAONALIS, Pult. cat., p. 48., Rack, ed., p. 55, pi. 21, f. 11. 



Body greenish or yellowish-grey, with brown and milky-white 

 specks. 



Shell oval-oblong, ventricose, with well marked close, irregular, 

 flexuous, longitudinal striae; thin, solid, glossy, semi-transparent, 

 yellowish horn-colour or greyish- white; whorls seven or eight; 

 spire convex, swollen in the middle, the last forming about three- 

 fourths of the whole shell, with well marked sutures; spire produced 

 and tapering ; mouth large and oval, equal to half o! the shell ; outer 

 lip expanded, slightly sinuous, depressed in the middle; inner lip 

 spread out on the columella ; umbilicus covered. L.2. B.I. 



Hab. Slow rivers, ponds and marshes. Holwell (H. H. Wood) ; 

 pond, Aimer; watercourses, Chamber layne's, Bere Regis ; river 

 Stour, Bryanston (J.C.M.P.). 



5. L. PALUSTRIS, Miiller, pi. 7. 



HELIX PALUSTRIS, Pult, cat., p. 48, Hack, ed., p. 55, pi. 18., f. 18. 

 (not good). Brit. Conch., vol. i., p. 113. 



Body dark grey with a tinge of violet,finely punctuated with black 

 and yellowish-white specks. 



Shell oblong, or oblong-conic, with well defined, irregular, flexuous 

 striae, not transparent nor glossy,transverse elevations very appa ent, 

 more so than in L. stagnalis; brownish horn-colour ; whorl six to 

 seven, moderately convex, the last occupying about two-thirds of 



