TERMS FOR ADVERTISING. 



Full Page, 

 Half Page, 

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 Eighth Page, 



Wmm WA^TiEl SMiLLg WaNlTii). 



CoNCiiOLOGisTS or Dealers having FRESH WATP:R SHELLS from any part 

 of *liP wnrlil fnr sale, or exchange, will please forward catalogues of species 



OF 



COMPARATIVE ZOOLOGY, 



AT HARVARD COLLEGE, CAMBRIDGE, MASS. 

 JFountielr fijj pribate suftscrfjjtfon, in 1861. 



Deposited by Louis Agassiz. 



^S 



Mala- 



halers. 



. Part 

 2, Sea 

 and 6 

 halers. 



:h and 

 halers. 



indent 

 'ith 15 

 d Vol. 

 'halers. 



►ea 



6 mos. 



8vo. 2 Vols. 



MONOGRAPH OF THE LIMNIADES, 



And other Fresh "Water Univalve Shells of North America. 



By Prof. S. S. Ilaldeman. 



Published in 8 Nos. 8vo, with 40 beautifully colored plates ; illustrating the 

 genera Lymnea, Planorbis, Physa, Paludina, Amnicola, Ancylus, &c. 

 A few copies of this rare and valuable work for sale by the Conchological 

 Section of the Academy of Natural Sciences. 



