262 THE DISPERSAL OF SHELLS. 



Rich. There are extensive nursery grounds in the 

 locaHty, and it is probable, as Mr. Rimmer has suggested, 

 that the shell was brought from the Continent in the 

 roots of plants or among moss.^ 



Clausilia tarvula Studer. Varieties of our 

 common C. rugosa have several times been incorrectly 

 referred to this species, which on this account long ago 

 received a place in our catalogues. The true C. parvula^ 

 it is stated in the '^ British Conchology " (1862), "in- 

 habits the North of France, as well as every other part 

 of the Continent, and may be expected also to be found 

 in Great Britain," and in fulfilment of this expectation, 

 as appears by the supplement to the fifth volume 

 (1869), several specimens have been found by Mr. 

 Grant Allen, at Kinver, near Stourbridge ; these, how- 

 ever, it has been suggested, were, in all likelihood, 

 " accidentally or intentionally imported from the con- 

 tinent." - Both this and the last species were excluded 

 from the Conchological Society's list of 1883, as not 

 having the slightest claim to rank as British. Con- 

 tinental specimens of both have been turned out by 

 Mr. Baillie, near Brora, Sutherlandshire. 



Many other foreign molluscs, no doubt, have occurred 



* "Jeffreys," v. (1869), Supplement, p. 162, pi. xcix. fig. 2; 

 "Rimmer," 1880, p. 178. 



' Gray's '^ Turton," 1857, pp. 186-8 ; Alder, *' Mag. Zool. Bot.," ii. 

 (1838), p.iii; "Jeffreys," i. (1862), p. 280; v. (1869), Supplement, 

 p. 161, pi. xcix. fig. I ; " Rimmer," 1880, pp. 1 17-18; J.T. Marshall, 

 " Science Gossip," xviii. (1882), p. 261. 



