LIMNMA, 55 



being united in a chain for that purpose. Leach has 

 remarked that, in consequence of the sexual parts 

 being distant from each other, one individual is able 

 at the same time to perform the function of each sex 

 with two others, as was first observed by Geoffroy 

 about the middle of the last century. The spawn 

 resembles that of the last genus." — B.C., vol. i. p. loi. 



A. Shell very thin and brittle, nearly covered by 

 a contractile expansion of the border of the 

 mantle ; spire very short. 



I. LiMNiEA GLUTINO'SA,* MULLER. Pl. V. 



Body large, glutinous, of a dark grey or greenish colour 

 tinged with yellow, and covered with golden-yellow specks ; 

 tentacles very short, sub-triangular, light greenish-yellow veined 

 with grey, and spotted with white ; eyes situated at the inner 

 base of the tentacles on small knob-like stalks ; foot extremely 

 large, speckled with white, broad and obtusely rounded in front, 

 and ending in a blunt tail. 



Shell globosely ovate, remarkably thin, very glossy, transparent, 

 pale amber or greyish horn-colour, often indistinctly banded 

 with a darker shade of the same colour, with remote, irregular 

 striae in the Hne of growth, and very faintly but closely striate 

 spirally ; epidermis very thin ; whorls 3-4, globular, body whorl 

 occupying the greater part of the shell ; spire slightly produced ; 

 suture deepish ; mouth nearly oval, slightly contracted above ; 

 outer lip extremely thin ; inner lip broadly spread on the base 

 of the penultimate whorl ; fold (on the pillar) curved, sharp. 



Inhabits ponds and ditches, chiefly in the home and 

 eastern counties ; it has also been noticed in the 

 following localities : — Near Dunster Castle, Somerset- 

 shire (Leach), Bala Lake (Gibbs), near Windermere 

 (Buiwer), B,C. Near Henley-on-Thames (Rich). 



* Glutinous, 



