294 JOURNAL OF CONCHOLOGY, VOL. ID, NO. ID, APRIL, I903. 



Cyclostoma elegans Miill.— Once found in Jersey at high-water 

 mark after a spring-tide, by Mr. Duprey, dead and empty, but with the 

 operculum /// situ. He thinks that this and other species of land-shells 

 which occurred with it may have been drifted over by currents from 

 the opposite French coast. This species is recorded by Jeffreys for 

 Alderney, but we know not on whose authority. We have found on 

 Rochers Hill, Alderney, two dead specimens which had fallen out of 

 a sand-bank quite a hundred feet above the sea level, one of which had 

 the operculum /// siUi ; so that Cyclostoma must have lived in the 

 island at one time, but it is not to be found there alive now. 



Hydrobia ventrosa Mtg. — Alderney, one specimen in shell-sand 

 on the sea-shore, probably washed in from the French coast. 



Var. elongata Jeffr. — Very abundant in Arnold's Pond, Guern- 

 sey, and in salt-water ditches running inland from Bordeaux Harbour; 

 also abundant at Mare de Carteret, near Cobo. Decollate specimens 

 are frequent {y^x. decollata Jeffr.). Under 7/. //;^^ ("Brit. Conch.," 

 vol. 4, p. 53) Jeffreys records a var. octona from Arnold's Pond, but 

 we have never found material for differentiating such a form, the de- 

 scription of which, moreover, reads uncommonly like that of H. 

 ventrosa. Specimens do occur which show some approximation to 

 typical H. ventrosa, with shallower suture and shorter spire. 



Neritina fluviatilis L. — Two dead specimens found on the shell- 

 beach at Alderney, probably washed in from the coast of I'^rance. 



Sphaerium corneum L. — A small vaiiety of this species is com- 

 mon in ditches behind 'Ivy Castle, Guernsey. 



S. lacustre Mull — Plentiful in a road-side pool at Lancresse, 

 Guernsey. 



Pisidium fontinale Drap. — Jersey (Duprey). 



P. pusillum Gme.l. — Jersey (Duprey). Guernsey, near Ivy Castle, 

 and in Talbot's Valley. Alderney, at roots of plants in many of the 

 cliff streamlets. Sark, in a pond near the harbour (see under/', uiilmin). 



P. nitidum Jen. — Jersey (Duprey). Guernsey, common at Cobo 

 and near Ivy Castle ; Grande Mare, one specimen. 



P. milium Held. — Guernsey, very rare near Ivy Castle. Incorrectly 

 noted by Cooke & Gwatkin as found in a small pond in Sark near the 

 harbour. Specimens from the same pond in 1884 proved to be P. 

 pusilltiDi, incrusted with a ferruginous deposit which may have led to 

 the error. Messrs. Cooke «S: Gwatkin quite admitted the possibility of 

 an error in identification. The pond was small and was thoroughly 

 searched in 1884. There is, therefore, no doubt whatever that the 

 P. roseum of/. Co7?ih., vol. 2, p. i,2\^P. pusilltnn of the ssime /on r/i a/, 

 vol. 4, p. 271. 



