CONTENTS. \ 



L, . No. XI. 



Conchological Observations on Lamarck's Family of Naiades. By P 

 II. Nicklin. - - - 



No. XII. 



Some further Kxperiments on the Poison of the Rattlesnake. Bj R 



Harlan, M.D. ... . io< 



No. xrn. 



Description of a New Genus of the Family of Naiades, including Eighl 

 Species, Four of which arc \» w ; also the Description of Eleven 

 New Species of the Genus Unio from tbe Rivi rsof the United Si 

 with Observations on some of the Characters of the Naiades. By 

 Isaac Lea. .... . 40 



No. XIV. 



Remarks on the use of the Maxillae in < 'oleoptorous Insects, with an Ac- 

 count of Two Species of the family Telephoride, and of Three of the 

 Family Mordellidse, winch ought to be the Type of Two Distinct Gen- 

 era. By N. M. llentz. 



No. XV. 



Description of a New Species of the Genus Astacus. By It. Harlan. 

 M.O. ..... 



No. XVI. 



Notice of an Anatomical Peculiarity observed in the Structure "i th< 

 Condor of the Andes ( Vultur gryphus, Linn.). I5y It. Harlan. M.D 



No XVII. 



< >n the Construction of Eclipses of the Sun. By John Gummi re 



