252 BIBLIOGRAPHY. 



The Land and Freshwater Shells of Montgomery- 

 shire (Extracted from collections Historical and Archaeolog- 

 ical, relating to Montgomeryshire and its borders, issued by the 

 Powys-land Club for the use of its members. — Vol. xxi., part xi., 

 April 1837), by J. Bickerton Morgan. 



This welcome list helps us to a knowledge of a little known 



district. Prior to this publication, only seven species were on 



record for the county, viz., Cyclas pallida^ Succinea Pfeifferi, 



Helix aspersa, hispida and nemoralzs, Clausilia riigosa and 



Ancylus fluviatilis. Now it is shown by Mr. Morgan's exertions 



that 24 land and nineteen freshwater shells inhabit the county, 



and this cannot by any means be regarded as a complete list as 



the author's investigations have been mostly confined to the 



district round Welshpool. The most interesting species are 



perhaps Zonites radiatulus and glaber, Helix aculeata^ Unio 



margaritifera, Limncea glabra and stagnalis. 



Manual of Conchology, Structural and Systennatic, 



with illustrations of all the species. — By Geo. W. Tryon, Junr. 

 Parts XXV. — xxxv. 



This great work continues to appear with great regularity, 

 and the excellence of the illustrations and exactitude and 

 accuracy of the text maintains the high standard to which we 

 have become accustomed. In these parts the following genera 

 are exhaustively treated — Terebridse, Cancellariidse, Strombidse, 

 Pediculariidse, Doliidse, Cassididae, Naticidae, Calyptrgeidae, 

 Xenophoridse, Vermetid^, Turritellidae, Csecidae, Eulimidse, 

 Pyramidellidse, Turbonillidse, Scalariidse, and Cerithiidse. The 

 monograph of the family Cyprseidae is prepared expressly for 

 the work by S. Raymond Roberts, who is so well and favourably 

 known in connection with his labours upon this group. The 

 fatnily Solariidae has been undertaken by William B. Marshall, 

 B.S., who has made this section of the Mollusca an especial 

 study. 



The parts we have under our notice contain nearly 1,000 

 pages of text, embracing full indices of the various family and 

 no less than 185 excellently executed plates. 



J.C, v., Oct., 1887. 



