THE LAND AND FRESHWATER MOLLUSCA OF DORSETSHIRE. 103 



5. Bulimus. 6. Pupa. 7. Vertigo. 8. Balia. 9. Clausilia. Shell 

 cylindrical ; mouth otten furnished inside with teeth, and in one 

 genus also with a moveable plate. 



10. Cochlicopa. 11. Achatina. Shell shaped like the last ; mouth 

 more or less no'tched at the base, and sometimes also toothed. 



Genus LSUCCINEA, Draparnaud. 



1. SUCCINEA PUTRIS, Linn* pi. 7. 



HELIX ?UTRis,Rack ed., p. 59, pi. 18, f. 19. 

 HELIX LIMOSA, Pult. cat., p. 48. 

 Body oblong and slightly thick, reddish-yellow above, paler below. 



Shell oval-oblong, fragile, very transparent, thin, striae extremely 

 fine, amber-colour ; whorls three to four, the last forming about four- 

 fifths of the shell ; spire very short and obtuse ; mouth oval, large, 

 being about two-thirds of the shell's length ; outer lip contracted 

 above. L.0.6. B.0.3. 



Hab. On the stems and leaves of water; and bog-plants, on 

 muddy and moist places. Generally distributed. 



2. S. ELEGANS, ItisSO, pi. 7. 



S. PUTRIS, var., F. Sf H. iv., p. 135, pi. cxxxi., f. 1 3. 



Body large in comparison to the shell, rounded anteriorly and 

 posteriorly, yellowish brown, sometimes black. 



Shell oblong, slightly solid, and scarcely transparent, dark amber- 

 colour, very finely striated ; whorls three to four, the last very large, 

 generally paler, and slightly nacrous within ; mouth oval, forming 

 nearly two-thirds of the shell. L.0.6. B. 0.25. 



Hab. Similar situations as S. putris, and as extensively dis- 

 tributed. 



Genut II. VITRINA, Draparnaud. 



VITRINA PELLUCID A MulUr, pi. 7. 



Body rather slender, large in proportion to the size of the shell 

 which is grey with a reddish tinge. 



Shell subglobular, very thin and fragile, with scarcely preceptible 

 spiral, close-set striae, semi-transparent and glossy ; whorls three fo 

 four, convex, the last occupying more than two-thirds of the t,hell ; 

 spire extremely short ; mouth nearly round, sloping slightly where 

 it is met by the penultimate whorl. L.0.125. B.0.25. 



Hab. Among moss, under stones, and on decaying timber 

 Generally distributed. 



