100 



The Univalve shells are as follows : 



Helix nemoralis, ClausUia nigricans (?) 



„ rotundata, Succinea putris f ? J 



„ umbilicata, Zua lubrica, 



„ Julva, Limnceus truncatulus, 



„ pulchella, Cyclostoma elegans, 



Zonites alliarizis, Carychium minimum, 



„ nitidulus, Acmefusca. 



„ excavatus, Bivalves. 



„ crystcdlinus, Pisidium pusillum. 



Pupa umbilicata, „ f?J 



As all these creatures are still living around us, their habits and 

 the conditions requisite for their -well-being, known to us, from a 

 consideration of the latter we may reasonably assume that they have 

 been in all time what they are now ; reasonings, therefore, based upon 

 this knowledge, are as likely to be correct, when applied to their 

 existence in distant Geological time, as when applied to their occurrence 

 in regions far distant from each other in the present day. 



Helix nemoralis inhabits woods and gardens, and Helix umbilicattiS 

 the loftiest, and consequently driest, points of the hills. 



Cyclostoma elegans is found amongst the moss, which usually covers 

 the loose rubbly Oolite upon the summits and sides of tlie hills, and 

 affects chalk and limestone districts generally, betokening, therefore, a 

 certain predilection for a dry habitat. 



Pujxi, umbilicata we have usually found in the moss covering old walls 

 and under stones ; Gray says, also under the " bark of trees in shady 

 places." The teeth of these specimens are unusually prominent, showing 

 that the animals existed under circumstances fovourable to their most 

 perfect development. Clausilia nigricans does not differ sirfficiently in 

 habit to call for special notice, but those which follow are of entirely 

 different character. 



Zonites alliarius and excavatus are foimd under stones with Helix 

 rotundatus, or in situations in a slight degree more damp. Zonites 

 nitidulus sometimes with the above, but generally in places still more 

 liiimid. Helix jndchella, Zonites crystallinus, Carychium minimum, and 

 Acmefusca, amongst wet moss in all situations, from that which fringes the 

 mart^in of the streams, upwards, and in the decaying leaves of the beech 

 woods which crown the hills — ^the last-named rare, Carychium exceedingly 

 abiindant. Zua lubrica inhabits moss in damp localities, as upon the 

 banks of the Gloucester and Berkeley, and Newent canals, but generally 

 in situations where the animal can adopt at will, the degree of 



