CONTENTS. 



Laws of the Society relating to the Transactions. ----- iii 



Officers of the Society for the Year 1839. ------ v 



List of the Members of the Society elected since the Publication of the Fifth Volume, 



New Series. ---.--.--vi 



Obituary Notice. - - - - - - - -- viii 



ARTICLE L 

 Description of New Freshwater and Land Shells. By Isaac Lea. - - - 1 



ARTICLE II. 



Descriptions of New North American Insects, and Observations on some already de- 

 scribed. By Thomas Say. — Continued from Vol. IV., N. S., p. 470. - - 155 



ARTICLE III. 



Notice of a Vein of Bituminous Coal, recently explored in the vicinity of the Havana, 

 in the Island of Cuba. By Richard Cowling Taylor, and Thomas G. Clem- 

 son. ---------- 191 



ARTICLE IV. 



Observations on the Changes of Colour in Birds and Quadrupeds. By John Bach- 

 man, D.D., President of the Literary and Philosophical Society of Charleston, 

 S. C, &c. ' - - - - - - - - 197 



VI. C 



