350 gain; food of some of the British mollusks. 



Frequently several kinds of food were supplied at the same 

 time, removed one after another as they were attacked by the 

 inhabitants, and fresh supplies of the uneaten put in place of 

 the stale or withered. When any kind of food was eaten with 

 such avidity as showed it to be a special favourite, the number 

 4 is used (this only rarely occurs); 3 shows that the food was 

 taken freely; 2, less freely; i, just touched, generally after two 

 or three days starvation; and o is only used when tHe food, 

 kept fresh by frequent renewal (no other being supplied) has 

 been untouched for at least three days. 



I kept two colonies of Arlon hortensis — one of the tyjie, 

 and another of the var. subfusca. It will be noticed that there 

 is a marked difference in their likes and dislikes. The variety 

 being less common than the type, this colony was naturally 

 smaller than the other, and peihaps individualism may account 

 for some of the variations. This is a subject which I hope to 

 investigate more full)'. I have observed that the fact of a 

 species having been found on a certain plant is no proof that 

 this species will feed on the plant — -at least in confinement. 

 I expected to discover the reason of the habit recorded of L. 

 arborum — that of ascending trees. The fact is that it did not eat 

 the foliage of any of our ordinary forest trees, nor any fungus or 

 other growth found on trees; the various insects found on trees, 

 or at least several of them, were also tried without result. 



The Zonites with which I have experimented frequently 

 remained for several days without eating, although supplied 

 with their favourite foods; on this account I make no mention 

 of negative results, simply giving a list of foliage, &c., which I 

 have found them eat in captivity. Helix sericea, H. caperata, 

 and Bulwius obscuries, I had for a short time only, and in 

 small numbers, so the negative results are not given. The 

 plants experimented with are in all cases of the same species as 

 those mentioned in the table, and the figures, when given, are 

 used for the same purpose. 



J.C., vi., Apr., 1891. 



