39<3 JOURNAL OF CONCHOLOGY. 



HYDROBIA (PALUDESTRINA) JENKINSI 

 AT LEWES. 



By LIONEL E. ADAMS, B.A. 



(Read before the Conchological Society, April 4th, 18 



I HAVE just examined an interesting consignment of Hydrobia 

 jenkinsi from Mr. C. H. Morris, of Lewes, who has discovered 

 a large and, apparently, suddenly-arisen colony in a small tribu- 

 tary of the Sussex Ouse near Lewes. This colony is interesting 

 in consisting, as far as can be judged from a few thousand 

 specimens, entirely of the uncarinated form, the carination 

 obtaining in the great percentage of specimens from all other 

 known localities. In this journal (Jan. 1893) I hazarded the 

 conjecture that this species was introduced in Baltic timber, 

 and I mentioned Newhaven as a likely place for the shell to 

 appear if the timber theory were correct. It is quite possible 

 for the shell to ascend the eight miles between Newhaven and 

 Lewes. 



I have just returned from a cursory visit to Wisbech, King's 

 Lynn, Sutton Bridge, etc., in search of H. jenkinsi, thinking it 

 likely that the timber imported along the ports of the Wash 

 might bring it there also ; but in each case the rivers are too 

 strongly tide-washed at the localities I visited for any shells to 

 remain on the banks, but I expect that a further and more ex- 

 haustive search among the backwaters and marshes around the 

 mouths of these rivers may establish its existence there. 



Mr. Daniel's discovery of the shell in a Staffordshire canal 

 is very interesting, but I have not yet been able to obtain par- 

 ticulars to throw light upon its supposed introduction there. 



Northampton, March 26th, 1894. 



J.C, Mi., July iSv-j. 



