CONTENTS. 



No. VI. July, 18^5. 



Page 

 Art. XVII. On two new Genera of Birdsy Formkhora 



and Drymopkila^ with Descriptions of several species* 



By William Swainson, Esq. F,R. 8f L.S., Sfc» 145 



Art. XVIII. Description of a new Genus of Mammifer*' 



ous Quadrupeds of the Order Edentata, By Richard 



Harlan J M.D. Professor of Comparative Anatomy 



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



Soc.y kc.Sfc » 1 54 



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 



Mindy and its modifications under Human Influence: 



including an analysis of the theory of Brute Action con* 



tained in Dr. Ilancock^s '' Essay on Instinct^ and it^ 



Physical and Moral Relations:^ By John Oliver 



French, 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 



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



the Mauritius. By W. J. Broderip, Esq. F.L.S., Sfc. 198 



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



Bell, Esq. F.L.S 204 



Art. XXIII. A Tabular view of the Genera composing 



the Class Ciiripedes, with Descriptions of the Species of 



Otion, Cineras, and Clyptra. By William Elford 



LEACHy M.D. F.li. ^ L.S.ySfc 208 



