SS Mr. W. S. Macleay on the Comparative Anatomy 



and Peacock. In both orders the sense of hearing is much 

 developed. In both orders we jfind animals, such as Squirrels 

 and Pigeons, with their toes perfectly free ; and others, as Hy- 

 dromys and Phasianu», which have them united at the base by a 

 membrane. Castor is an aquatic animal, having some relation 

 to Cetacea ; Struthio is a terrestrial animal, approaching to ZVa- 

 tatores. And so on relation comes so fast upon relation, that I 

 know not how we can for a moment hesitate to place the Glires 

 opposite to the Rasores. 



I conceive it now to be demonstrated, that, so far as relates to 

 the analogies existing in nature between the orders of Mammalia 

 and Aves, we ought to place them thus : 



Animals typically. 



1. Term carnivorous 1. Raptores. 



2. Primates omnivorous 2. Insessores. 



3. Glires frugivorous 3. Rasores. 



4. Ungulata frequenting the vicinity of water ... 4, Grallatores. 



5. Cetacea aquatic 5. Natatores. 



The above series of Mammiferous orders is only adapted 'ana- 

 logically to that of Birds, as given by Mr. Vigors*, and founded 

 by him on relations of affinity. I now, therefore, come to the 

 examination of the second subject ; namel)^ The Connection of 

 the above Orders of Mammalia in their own Series of Affinity. 

 And commencing with the Primates, as the universally acknow- 

 ledged point of departure, I find Hermann in 1783 writing of 

 Monkeys as follows : — " Ex alterd parte minutissimae istae Ame- 

 rican£e et delicatulae species quas Sagoinos vocant, unguibus acu- 

 tioribus et magis in arcura curvatis, mintriente voce et omnia ar- 

 rodendi instinctu, ips^ demilm corporis exilitate Glirium familiae 

 sunt conterminae. Si enim k S. argentata capite recedas, nonne 



* Linn. Trans, vol. xiv. p. 406. 



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