32 Mr. W.S. Macrzax on the Comparative Anatomy 
and Peacock. In both orders the sense of hearing is much 
developed. In both orders we find animals, such as Squirrels 
and Pigeons, with their toes perfectly free ; and others, as Hy- 
dromys and Phasianus, 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 Na- 
tatores. And so on relation comes so fast upon relation, that I 
know not how we can for a moment hesitate to place the Gres 
opposite to the Rasores. 
I conceive it now to be demonstrated, that, so far as rélates to 
the analogies existing in nature between the orders of Mammalia 
and Aves, we ought to place them thus: 
Animals typically. 
l..Fzi& |... CAEDINOUUMÉ 2 rua. t tes 1. Raprores. 
2. PRIMATES ...-. UPTON a ERO TIRE EL 2. Ixsrssonzs. 
S GUES.: |... IFUEIVOFOUB s e o ee te he es 3. Rasonzs. 
4. UNGULATA . . . . . frequenting the vicinity of water. . . 4. GRALLATOREs. 
&.-CRTACRA . olv aquatic. Los cov. «cite rei FS 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 ; namely, 'l'he 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 alterá parte minutissime istee Ame- 
ricanz et delicatule species quas Sagoinos vocant, unguibus acu- 
tioribus et magis in arcum curvatis, mintriente voce et omnia ar- 
rodendi instinctu, ipsá demüm corporis exilitate Glirium familiz 
sunt conterminz. Sienim à S. argentate capite recedas, nonne 
* Linn. Trans. vol. xiv. p. 406. 
et 
