DISPERSAL BY MAN. 201 



Cargoes and consignments of vegetable productions, 

 other than those intended for horticultural purposes, 

 seem likely also to have served occasionally as means 

 for dissemination. Thus in a recent enumeration of 

 Morocco shells mention is made of the finding of Helix 

 dehnii amongst gum arabic ; ^ Helix vermiculata, as we 

 shall see in the next chapter, has been found alive in a 

 parcel of chemist's horehound ; ^ and living specimens 

 of Helix caperata have been discovered amongst screen- 

 ings from barley intended for malting ; we find, too, 

 that several specimens of a foreign snail were once 

 discovered alive in a garden into which a quantity of 

 such screenings had been imported.^ Dead shells of 

 Helix alauda, a species belonging strictly to the fauna 

 of Cuba, have been found on one or two occasions 

 among bananas in Boston, Mass., and a living specimen 

 once found in a grove in Rhode Island was probably 

 introduced, as Mr. John Ford has suggested, with a 

 bunch of those fruits."* The importation with dye-wood 

 from Brazil of two specimens oi Bulimus largillierti has 

 been noted somewhat recently in the " Nachrichtsblatt 

 der deutschen malakozoologischen Gesellschaft ;^" and 

 living specimens of Bulimus undatus^ adhering to 

 tropical timber, are said to have been imported into 



* "Zoological Record," xvii. (1880), Moll., p. 24, referring to 

 "J. de Conch.," xxviii., pp. 1-83. 



* Proc. Conch. Soc, "Journ. of Conch.," vi. (1891), p. 393. 

 3 P. B. Mason, "Journ. of Conch.," iii. (1880-2), p. 118. 



^ J. Ford, " Conchologists' Exchange," ii. (1887), 71-2. 

 5 O. Boettger, " Nachr. mal. Ges.," xviii., p. 58, as quoted in 

 "Zoological Record," xxiii. (1886), Moll., p. 61. 



