297 



NOTES ON FALUBESTRINA JENKINSI (Smith) AND P. CONFUSA 



(Frauenf.). 



By A. S. Kennaed and B. B. Woodwaed, F.L.S., etc. 



Read Uth April, 1899. 



Paludestrina Jenkinsi (Smith). 



Paludestrina Jenhinsi (Smitli) was first described, as HydroMa 

 Jenhinsi, by Mr. E. A. Smith in 1889/ from examples taken at 

 Plumstead by Mr. A. J. Jenkins. Previous to this, however, three 

 examples had been presented to the British Museum (Natural History) 

 by Mr. "Walter Crouch, who had obtained them at Beckton. Preceding 

 Mr. Smith's description was a note on the same form by Mr. J. T. 

 Marshall,^ who considered it a variety of P. ventrosa (Mont.), and 

 named it var. carinata. Mr. Jenkins informs us that he first 

 noticed it in 1883 at East Greenwich. It is worthy of note that 

 Mr. G. Sherrifl Tye had examples, sent to him in 1886 by the late 

 Miss E. E. Fairbrass, that had been taken between Deal and 

 Sandwich, probably from the same locality where Mr, L. E. Adams 

 obtained his specimens in 1891.^ Since the species was described it 

 has been found in England at Topsham, Lewes, Hythe, Short Heath, 

 near Dudley, near Middlesbrough, and Droylsden, Lancashire. In 

 all these places it occurred abundantly, with the exception of the 

 last-named, where a single dead specimen only was obtained. It has 

 also been met with in several localities in Ireland, and we are greatly 

 indebted to Mr. B. Welch, of Belfast, for kindly furnishing us with 

 particulars. The first examples obtained in Ireland were procured 

 by Mr. "Welch in 1893, and were dead specimens from those curious 

 ' pockets ' of shells among sand-dunes at Port Stewart, co. Derry. Since 

 then many examples have been seen living near by. Dead specimens 

 have occurred at St. Johnstone, co. Donegal, and numerous live shells 

 at Carrigans, in the same county, both these localities being on the 

 Biver Foyle. It has also been taken at Culmore, co. Derry ; Kenmare, 

 CO. Kerry ; Newry, co. Down ; and Antrim, at the mouth of the 

 Biver Sixmilewater. It has not hitherto been detected outside the 

 British Isles. The only contribution to its anatomy was made by 

 one of us in 1892,* when the radula was described and figured, and 

 contrasted with that of Paludestrina ventrosa. 



"Notes on British Hydrobice, with description of a supposed new species": 



Journ. Conch., vol. vi (1889), pp. 142-5. 

 " On Hydrobice and Assiminece from the Thames VaUey " : t.c, p. 141. 

 Journ. Conch., vol, vii (1893), p. 148. 

 B. B. Woodward, " On the Radula of Paludestrina Jenhinsi (Smith), and that of 



P. ventrosa (Mont.) " : Ann. & Mag. Nat. Hist., ser. vi, vol. ix (1892), 



pp. 376-378. 



VOL. III. OCTOBER, 1899. 21 



