58 LIMNJEAD^E. 



S. OBLONGA. Draparnaud. PL VII, fig. 19. 



Shell ovate ; whorls three or four, produced, ventricose ; aperture 

 ovate. 



This rare British Succinea, may be readily distin- 

 guished from putris, by being much smaller, seldom 

 measuring more than a quarter of an inch in length, 

 having the spire more produced, and the aperture 

 nearly oval, and about equal to the spire in length. 

 Animal blackish grey, with paler thick set tentacles. 



Hab. Edge of ditches, &c. It was found near 

 Swansea, but we have been told that it is now extinct 

 in that locality ; the only place in which it appears to 

 have been found in England is at " Topsham, Exeter, 

 three or four specimens in salt water marshes." It 

 has been found in several places in Ireland, and near 

 Glasgow, in Scotland. Sometimes found in superficial 

 deposits, half fossilized. 



LIMNJEADJE. 

 PHYSA. Draparnaud. 



Shell Thin, spiral, sinistral, polished ; moutli oblong. 

 Animal Tentacles long, with eyes at their bases. 



The British species of this genus have been formerly 

 referred to two genera, Physa and Aplexus. The 

 animal of the former has a dilated mantle with lobed 

 edges ; that of the latter has a simple mantle. 



P. FONTINALIS. Linnceus. PL VII, fig. 80. 



Shell oval, horn coloured ; spire very short and obtuse ; aperture 

 much dilated. 



Bulla fontinalis, Linn., fyc. 



This pretty shell which is commonly called " The 

 Bubble Shell," is common throughout the greater part 

 of the British Isles. It varies much in form, and has 

 been separated into a great many varieties by some 

 naturalists. It may be easily distinguished by its 

 exceedingly small spire, its regular oval form, its thin 

 glossy and almost smooth exterior, together with its 

 yellowish horn colour. It often attains to the third of 



