14 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



Woolwich. As the species had features which distinguished 

 it from all known British or foreign Hydrobise, Mr. Smith 

 decided to give it the name of its discoverer, and called it 

 Hydrobiajenkinsi {Journal of Conchology, Yol. VI., p. 142). 

 In December, 1892, Mr. Lionel E. Adams read a paper 

 before the Conchological Society in which he stated that 

 he had discovered specimens of the shells at Countess "Weir, 

 halfway between Exeter andTopsham, and also at Sandwich. 

 He suggested that the species had been introduced through 

 the importation of timber from Russian or Finland ports. 

 In November, 1893, Mr. A. T. Daniel reported the discovery 

 of a nourishing colony of the shell in an inland locality, 

 namely, in a canal near Dudley, Staffordshire. In April, 1894, 

 Mr. Adams again reported that there had arisen a large 

 colony near Lewes, in Sussex. In July of the same year, 

 the Journal of Conchology had a note by Mr. C. H. Morris 

 that H. jenkinsi had, in that locality, enormously increased 

 in numbers. Suddenly appearing in the neighbourhood, it 

 could now be gathered by the gallon. In November of the 

 same year, it was observed in a canal at Short Heath Station, 

 near Willenhall, by W. H. Overton. In December, 1897, 

 came the first record of an Irish locality, Mr. Adams again 

 writing that he had seen specimens gathered at the mouth 

 of the Bann. He believed this habitat supported his theory 

 that it was imported through timber, as he found that three 

 firms imported Baltic timber at Coleraine, and that a con- 

 siderable amount was used for the Bann mouth extension 

 works. The Bann is a thorough tidal river below Coleraine, 

 and there can be no doubt that II. jenkinsi, on this occasion 

 at least, enjoyed the benefit of salt water. In May, 1898, 

 Mr. A. Hann had a note in the Journal of Conchology, Vol. 

 IX., p. 89, that he had discovered the species in abundance 

 near Middlesborough, where Baltic timber is constantly 

 brought into the Tees. In June of the same year, Mr. 

 Adams had another note {Ibid., p. 114) regarding the dis- 

 tribution of this species, arising out of the fact that Mr. 

 Welch, of Belfast, had sent him some specimens found at 

 Kenmare, in a little stream running into the tidal river at 

 the head of the estuary. Baltic timber was imported at 



