SUCCINEA. 251 



This admirable contrivance may be observed by procur- 

 ing a living specimen; killing the animal when exserted, 

 which may be done by drowning it ; removing it, and then 

 breaking oif the outer part of the aperture. The clausium 

 may then be seen, and the elasticity of the spring may be 

 renewed by moisture. The British species are C. lami- 

 nata, C. hijolicata, C. j^licatula, C, nigricans, C. bidens, and 

 C. labiata. 



ZuA lubrica is like a small BulimuSj with a rather short, 

 lead-coloured body, with a very polished shell. It lives 

 among moss, in woody districts. 



AzEKA tridens. — The teeth or folds in the aperture of 

 the shell distinguish this little species generically from 

 Zua. 



AcHATiNA acicula is a little w^hite 3ulimtts-like animal, 

 with a simple white shell; the latter differs from those of 

 Bulimi in having a little notch abruptly terminating the 

 inner lip. 



SucciNEA jmtris and ohlonga. — The first of these is com- 

 monly known as 8. amjoJdhia, from its habit of frequenting 

 river-sides and other damp places. The upper pair of ten- 

 tacles is thick and swollen ; the foot very large ; the shell 

 is oval, with an oblique, large aperture, and of that transpa- 



