14 



and Dorset (Montagu), Suffolk (Sheppard), Cadley, near 

 Swansea (Jeffreys) and at Finnoe, in Tipperary (Thomp- 

 son). Inhabits Germany (Forbes), and Sweden(Nilson). 

 Professor Forbes records it as found fossil in the 

 freshwater Pleistocene beds of Grays, and elsewhere in 

 the South of England. 



PisiDiuM NiTiDUM (The Shining Pera). Jenyns, 



This Pisidium is somewhat similar in shape to Pisi- 

 dium pusillum, being slightly more convex than that 

 species. The umbones are rather obtuse. The epider- 

 mis is very shining. The greatest size is one-eighth of 

 an inch long, and not quite so much broad. 



Found chiefly in clear ponds. 



As with Pisidium cinereum, I record this shell on the 

 authority of Mr, Jeffreys, who procured it in Clumber 

 Lake. 



The distant localities are, ditches in Battersea Fields, 

 and in Cambridgeshire (Jenyns), Sandwich, Kent (Jef- 

 freys), near London (Grey), Worcester (Brown), Pres- 

 ton (Gilbertson), Scarborough (Bean), Northumberland 

 (Hancock), near Darlington (Backhouse), Oxwich, near 

 Swansea, Tenby, and Manorbeer, in Pembrokeshire 

 (Jeffreys), Wolf-hill, near Belfast, Lough Gill Sligo, 

 Portarliogton, and Finnoe (Thompson), Cork (Wright), 

 Aberdeenshire (Macgillivray), Bracadale and Portree, 

 in the island of Skye (Barlee). 



PifiiDiuM OBTUSALE (The Gibbous Pera). PJeiffer. 



The form of this shell is a rounded-oval. The um- 

 bones are tumid, and slightly prominent. The epider- 

 mis is of a dirty-green colour. The largest size it at- 

 tains is If lines long, and 1| lines broad. 



