OF CONCHOLOGY. 113 



acquaintance with his subject, but it is a fact that not one pro- 

 fessed conchologist in fifty understands the true specific charac- 

 ters of the Unionidse ! It is only the very few who are initi- 

 ated that can fairly estimate the great value of Dr. Lea's writings, 

 and properly appreciate the grandeur of this monumental work. 

 The species described in Vol. 12 have already been enumer- 

 ated by me in noticing the Proceedings of the Philadelphia 

 Academy where they were first published. They are principally 

 of the United States, although a goodly number are from South 

 and Central America and Asia Minor. The illustrations of 

 course are very accurate and of the highest artistic merit ; 

 indeed nothing inferior in this way would be tolerated by the 

 author, whose careful supervision of all the mechanical details 

 has rendered his volumes in all respects models of accuracy and 

 beauty. 



II.— FOREIGN. 



BRITISH. 



Zoological Record, iv. 8vo. London, 1868. 



Pages 485-602 of this valuable work contains the review of 

 Conchological literature for the year 1867, by Dr. Edw. von 

 Martens. The work as usual, is very thoroughly done : — first 

 the titles of all separate works as Avell as papers in zoological 

 journals are given, next follow the faunas, and finally the mol- 

 luscaare reviewed by families. 



FRENCH. 



Nouvelles Miscellanies Malacologlquea. By M. Paladilhe. Parts 2 

 and 3. Svo. Paris, 1867-8. 



These papers have been noticed by me already, upon their 

 first publication in the " Revue et Magazin de Zoologie," the 

 above title being adopted by the author for his extra copies. 

 There are several lithographic plates. 



Revue et Magasln de Zoologie. 1869. No. 1. 



Descriptions d'especes 7iouveUes du genre Pomatias, suivies 

 d'un Apergu synonymique sur les especes de ce genre. 

 Bj Alfred de Saint-Simon. 



