154 FOUKTH llEPORT — 1834. 



analogy. In 1823*, Mr. Vigors made an application of Mr. Mac- 



Leay's principles to the class of Birds, pointed out the orders 

 and families, and endeavoured to show that the natural affinities 

 which connect the several groups in that class obeyed the same 

 laws as those laid down in the Horce Entomologiccc. The same 

 author subsequently followed up this inquiry in some particular 

 families of the same classf. In 1824 J, Mr. MacLeay applied his 

 own principles to the arrangement of the Molhisca Tunicata. 

 In the same year Mr. Swainson endeavoured§, with reference 

 to the circular and quinary system, to work out the natural 

 affinities of the family of LaniidcB in ornithology. In 1825, 

 appeared the first number of the Annulosa Javanica, in which 

 Mr. MacLeay again brought his views to the test by appUang 

 them to the natui'al arrangement of the insects collected in Java 

 by Dr. Horsfield. Circumstances prevented Mr. MacLeay from 

 proceeding with this arrangement beyond that of a small portion 

 of the Coleoptera ; but Dr. Horsfield himself subsequently pro- 

 ceeded to publish the Lejndopfera || classed according to the 

 same principles. In the same year, (1825,) Mr. Gray published an 

 attempt at the natural distribution of the Mammalia into tribes 

 and families^, and likewise of the genera of the classes Reptilia 

 and Amphibia** . Both these, but the former more especially, 

 were intended to illustrate Mr.MacLeay's principles. In 1826ff, 

 Mr. MacLeay gave the i-esult of some anatomical investigations, 

 which tended to confirm the accuracy of Mr.Vigors's arrange- 

 ment of Birds. In the same paper he considered the affinities 

 which connect the various orders of Mammalia, the point of 

 transition from this class to Aves, and -the true analogies 

 existing between the respective orders of the two classes. 

 In 1827^^5 Mr. Swainson gave a sketch of the natural affi- 

 nities of the Lepidoptera diurna of Latreille, being also an 

 application of Mr. MacLeay's principles. Lastly, in 1831, ap- 

 peared the second part of the Fauna Soreali-Amencaiia, in 

 which Mr. Swainson, still adopting Mr. MacLeay's views in 

 part, but modifying them according to what (since his former 



* Linn. Trans., vol. xiv. p. 395. 



-f- Zool. Journ., vol. i. p. 312. and vol. ii. p. 368. 



X Linn. Trans., vol. xiv. p. 527. § Zool. Journ., vol. i. p. 289. 



II Descriptive Catalogue of the Lepidopterous Insects contained in the Mu- 

 seum of the Hon. E. India Company, ^-c, with introductory Observations on a 

 general Arrangement of this Order of Insects. 4to, 1828, &c. 



t Ann. Phil., vol. xxvi. p. 337. ** Id., vol. xxvl. p. 193. 



W Litin. Trans., vol. xvi. p. 1. 



XX Ann. Phil., vol. i. p. 180. 



