TRANSPLANTATION OF UNIVALVES. 89 



ness, for the turtles were " swimming about wuth the 

 Limncecs still keeping ' their seats ' upon them." ^ Mr. 

 Jenkins has seen molluscs of various kinds, both young 

 and adult, crawling upon the bodies of frogs, toads, and 

 newts kept by him from time to time. In such 

 positions, no doubt, the creatures are occasionally 

 carried for short distances overland from one piece of 

 water to another. Two observations bearing directly 

 on the point can be given. A small living shell of 

 Ancylus lacustris was detected by Mr. Baker Hudson 

 adhering to one of the legs of a frog caught, hopping 

 through the grass by the side of a footpath, in Cowpen 

 Marsh, County Durham, perhaps thirty yards from the 

 nearest water, the main drainage dyke of the marsh ; 

 and a full-grown specimen oi LimncBa peregra was seen 

 by Mr. Standen, in 1883, upon the back of a toad 

 which was tramping leisurely along the road, in the 

 dusk of evening, at Goosnargh, about twenty yards from 

 the water of a roadside pond.^ I am not aware that 

 any animal has ever been seen to enter the water 

 with a shell adhering; such an observation — which is 

 within the bounds of possibility — would certainly be 

 " of the nature of a great good fortune." 



1 W. Thompson, " Catalogue of the Land and Fresh-water 

 Mollusca of Ireland," " Ann. and Mag. Nat. Hist.," vi. (1841), 119. 



2 This observation was referred to by Mr. Standen in " Science 

 Gossip," xxi. (1885), 281, and quoted by me in the " Naturahsts' 

 World," iii. (1886), 61. 



