CONTENTS. 



No. VI. Juli/, 1825. 



Page 



Art. XVir. On txco new Genera of Birds, Formicivora 

 and Drymophila, with Descriptions of several species. 



By William Swainson, Esq. F.R» Sf L.S., Sfc 145 - 



Art. XVIII. Description of a new Genus of Mammifer- 

 ous Quadrupeds of the Order Edentata. By Ricuaru 

 Harlan, M.D. Professor of Comparative Anatomy 

 to the Philadelphia Museum, Member of the Am. Phil. 



Soc , &c. Sfc. 154 



Art. XIX. An Inquiry into the true nature of Instinct, and of 

 the Mental Distinction between Brute Animals and Man. 

 Essay III. On the Specific Constitution of the Brute 

 Mind, and its modifications under Human Influence: 

 including an analysis of the theory of Brute Action con- 

 tained in Dr. Hancock's " Essay on Instinct, and its 

 Physical and Moral Relations.''^ By John Oliveh 



Fr ENcn, Esq 164 



Art. XX. Sketches in Ornithology ; or Observations on 

 the leading Affinities of some of the more extensive groups 

 of Birds. By N. A. Vigors, jun. Esq. M.A. F.L.S.. 182 , 

 Akt. XXI. Some account of two new Species of Shells from 



the Mauritius. By IV. J. Broderip, Esq. F.L.S., 8fc. 19S 

 Art. XXII. On a nezo Genus of Iguanidce. By Thomas 



Bell, Esq. F.L.S "^04 



Art. XXIII. A Tabular view of the Genera composing 

 the Class Cirripedes, zsith Descriptions of the Species of 

 Otion, Cineras, and Clyplra. By William Elford 

 Leach, M.D. F.R. ^ L.S., S^'c 20S 



