154 TRYON : MANUAL OF CONCHOLOGY. 



Manual of Conchology, structural and systematic, 

 with illustrations of the species. — Vol. I. — M. 



By GEORGE W. TRYON, Junr. 



This important work, of which two volumes lie before us, 

 aims to be the most useful and comprehensive on Conchology 

 that has yet been issued. The distinguished author, G. W. 

 Tryon, junr , is well known by his many able articles on North 

 American MoUusca, and also by his connection with the "Ameri- 

 can Journal of Conchology," which periodical he edited for many 

 years. 



The author has exceptional facilities for the compilation of 

 a work of this nature by his connection with the Academy of 

 Sciences of Philadelphia, the Conchological Museum of which 

 Institution ranks among the largest in the world in the species 

 represented, while its series illustrating variation and geographical 

 distribution are probably unrivalled. Its library contains almost 

 every work ever published on the subject, as well as Transactions 

 of learned bodies, &c. 



It is intended to figure every genus and every recent species 

 — so far as specimens or hitherto published figures will enable it 

 to be done — and it is estimated that 30,000 or 40,000 illustrations 

 will be required. 



The First Volume is devoted entirely to the Cephalopoda, 

 for the illustration of which group 112 plates are required, repre- 

 senting the fossil and recent species, with details of anatomy, 

 embryogeny, &c. The volume is closed by a very complete 

 alphabetical index of the species cited, giving the synonymy and 

 a very full description of the numerous plates illustrating the 

 Monograph. 



The Second Volume of this beautiful work is devoted to 

 the Muricinse and Purpurinse, and is illustrated by 70 plates, 



