372 JOURNAL OF CONCHOLOGY, VOL. II, NO. 12, OCTOBER, I 906. 



I was at Windermere in 1902 and found the shell swarming along 

 the western side of the lake. 



C, pusilla Turton [=Pisidium pusillum {Gmelin)\. — "Very 

 common in ditches that are at times nearly dried up. It is particularly 

 abundant near the signal posts opposite Liverpool, 1836. — T.G." 



Dreissena [Dreissensia] polymorpha (/'t///<7i^). — "Is supposed 

 to have been introduced by some foreign vessel. Be that as it may, 

 it has become universally distributed throughout the kingdom. It is 

 difficult to say how it got into the reservoir at Beswick, but it has 

 increased there to a marvellous extent. — T.G." 



Mysca pictorutn Turton [=:Unio pictorum Z.]. — "Common 

 in canals. It is particularly fine in the great military canal, Kent. — 

 T.G." 



M. solida Turton [=Unio tumidus Retz\ — "Occurs in deep 

 slow rivers. It may be found near Welshpool. — T.G." 



Unio deshayesi Mich. [=Unio pictorum L\ — "Has been 

 found in the river Weaver above Weaverham; also at Bolton Bridge, 

 Yorks., a short distance below a place called the Strid. — T.G." 



U. margaritifer (Z^.). — River Lune at Caton, near Lancaster; 

 Conway at Llanrwst; and in the river at Ambleside, 1835. 

 var. sinuata. — Windermere, 1835. 



B I B L I O GRAPH Y. 



(limited to works received by the society's librarian). 



" Monograph of the Land and Freshwater Mollusca of the British Isles," 



by John W. Taylor (part 12, pp. 225-280). 



This part concludes Avion horlensis and contains A. circtunscriptns, A. inler- 

 vtedms, Geoi/ialactis /iiaaclosits, Vitrina pellucida and commences the genus Hyalinia 

 (for which name the author justifies his preference). There are photographs of 

 characteristic habitats of each species by R. Welch of Belfast. An appendix of 

 eighteen pages containing much information regarding the various slugs brings our 

 knowledge of these down to date. The coloured plate — particularly successful as 

 regards the Milaces — includes four varietal forms of AgrioUinax agrestis, four of 

 Ag. Iccvis, six of Milax gagates, and six of M. sowerbyi. 



"A Pocket Guide to the British Non-Marine Mollusca," by E. W. Swanton 



(Lockwood, 2/6). 



The author has taken the last ''List of British Non-Marine Mollusca" published 

 by the Conchological Society, and has described each species and variety. A number 

 follows the name of each species indicating the extent of its range as given in the 

 latest census published by the Conchological Society. The ten alien species are 

 described in small type, and the sixteen fossil forms in italics. 



