IV 



CONTENTS. 



83 



85 



85 



88 

 97 



102 



A short description of five (supposed) new species of the genus 

 MuRJENA, discovered by Mr. Le Sueur, in the year 1816. 

 ByC.A. LeSueur 81 



Description of two new species of the genus Gadus. By the 

 same 



Description of a new species of the genus Cyprinus. By the 

 same. 



An Account of an American species of Tortoise, not noticed 

 in the systems. By the same. 



A new genus of Fishes, of the order Abdominales, proposed un- 

 der the name Catostomus, and the characters of this ge- 

 nus, with those of its species, indicated. By the same. 



An Account of the Crustacea of the United States, continued. 



Catostomus, a new genus of Fishes, concluded. 



An Account of two new genera of Plants; and of a species of 

 TiLLiEA, and another of Limosella, recently discovered 

 on the banks of the Delaware, in the vicinity of Philadel- 

 phia. By Thomas Nuttall HI 



Descriptions of new species of Land and Fresh-water Shells of 

 the United States. By Thomas Say 



Descriptions of four new species, and two varieties, of the ge- 

 nus Hydrargira. By C. A. Le Sueur. 



Observations on the Geology of the West India Islands, from 

 Barbadoes to Santa Cruz, inclusive. By Wm. Maclure. 



Observations on several species of the genus Actinia; illus 

 trated by figures. By C. A. Le Sueur. 



An Account of the Crustacea of the United States, continued 



Observations on several species of the genus Actinia, con 

 tinued 



Description of Collinsia, a new genus of Plants, By Thomas 



Nuttall. 189 



Act of Incorporation 19S 



Constitution. 197 



Catalogue of the Library 203 



List of Donors to the Library. 212 



List of Donations to the Museum. 213 



List of Donations to the Apparatus 219 



123 

 126 



134 



149 

 155 



169 



