iV CONTENTS. 



By Fred. G. King and Edward G. Ludlow. Page 



Appearances on dissection of the Pboca cristata, 99 



By John Le Conte. 



Description of a new species of Siren ; with some observa- 

 tions on animals of a similar nature, ... 52 



Observations on the North American species of the genus 



Utricularia, --------- 72 



Observations on the North American species of the genus 



Gratiola, 103 



Observations on the North American species of the genus 



Ruellia, 140 



Description of some new species of North American Insects, - 169 



By J. B. Ricord Madianna. 



Observations and Experiments on the Seeds of the Cerbera 



Thevetia, - - - 8tf 



Researches and Experiments on the medical properties of 



some species of the genus Passiflora, - - - - 127 

 By Samuel L. Mitchill. 



Description of a new and gigantic species of the genus Ce- 



phalopterus of Dumeril, ...--- 23 



Observations on the Teeth of the Megatherium recently dis- 

 covered in the United States, ----- 58 



Description of an extraordinary Fish resembling the Style- 



phorus of Shaw, --------82 



By James Renwick. 



Examination of a Mineral from Andover Furnace, Sussex 



county, New-Jersey, -------37 



On the geological position of the Trilobites found at Trenton 



Falls, 185 



By Lewis D. De Schweinitz. 

 An Analytical Table to facilitate the determination of the 



hitherto observed North American species of the genus 



Carex, 62 



By John Torrey. 

 Description of some new or rare Plants from the Rocky 



Mountains, collected in July 1820, by Dr. E. James, - 30 

 Notice of a locality of Yenite in the United States, - - 51 



An account of the Colutnbite of Haddam, Connecticut ; and 



notice of several other North American Minerals, - - 89 

 Description of some new Grasses, collected by Dr. E. James, 



during the expedition of Major Long to the Rocky 



Mountains, in 1819-20, 148 



By Joseph G. Totten. 

 Notes on some new supports for Minerals subjected to the 



action of the common Blow-pipe, 109 



