118 CYCLADIDiE. 



It is by no means one of our commoner shells, and is 

 apparently less infrequent in the north than in the more 

 southern parts of England. Mr. Alder has found it near 

 Newcastle, Mr. Bean at Scarborough (where it is not 

 scarce), Mr. Thompson at Lichfield ; and Capt. Brown 

 records the vicinity of Manchester and the lakes of West- 

 moreland for its localities. Montagu met with it in Devon- 

 shire and Wiltshire, Mr. Jenyns at (var. 1.) Bookham Com- 

 mon in Surrey, and more sparingly in Cambridgeshire, 

 and Mr. H. Strickland at Hornsea in Yorkshire. Mr. 

 Jeffreys has taken it in the Clumber lake, Notts, and in 

 the neighbourhood of Bristol. 



In Ireland, observes Mr. Thompson, it is also rare and 

 local, but occurs in the east and south ; it has been taken 

 from a pond in the Phoenix Park, the Grand Canal, and 

 elsewhere in the vicinity of the metropolis ; also at Cork, 

 Youghal, &c. 



On the Continent it occurs in Sweden, Germany, Bel- 

 gium, France and Italy. The C. partumeia of Say, in 

 despite of the ventricosity of the adult, is very closely allied, 

 especially in outline, to this species, and may be regarded 

 as its transatlantic representative. 



C. LACusTRis, Draparnaud. 



Cydas lacustris, Drap. Moll. Terr, et Fluv. France, p. 130, pi. 10, f. 6, 7. — 

 TuRT. Manual Land and Fresh-water Shells, p. 14, pi. 1, 

 f. 4. — Gray, Manual Land and Fresh- water Shells, p. 17, 

 pi. 1, f. 4. — Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 268. 

 — C. Pfeif. Deutsche Land und S'ussw. Moll. pt. 1, p. 122, 

 pi. 5, f. 6, 7. — KiCKX. Moll. Brabant, p. 88. — Gras, Moll. 

 Terr, et Fluv. France, App. p. 23 (copied from Draparnaud). 



It is from specimens in the valuable collection of Mr. 

 Jeffreys, marked " Exmouth, 1881, and Dr. Turton's ca- 



