38 Mr. W.S. Mactreay on the Comparative Anatomy 
cum Primatibus conjunxit, caterum moribus et ingenio im- 
mensum distans.” M. Cuvier also, alluding to the remarkable 
structure of the arteries in the limbs of the Sloth, says: ‘“ Cette 
structure se rencontrant aussi dans les Joris dont la démarche 
n’est guéere moins paresseuse, il serait possible qu’elle exercat 
quelque influence sur la lenteur des mouvemens*.” Having 
thus established an affinity in the Sloth to the genus Stenops 
among the Primates, we find Hermann again saying, in the same 
page, “ Anomalum Bradypodis genus cum Pecoribus connecte- 
rem ob quatuor ruminantes ventriculos:” and we find Cuvier 
in the Régne Animal alluding to the same relationt. Hence I 
conceive that the Bradypode will be allowed to connect the 
Primates and Ungulata. But Hermann, p. 64, connects the 
Bradypode with Myrmecophaga, as well on account of the strong 
nails reflexed under the palm and incapable of separate motion, 
as of their deficiency of incisors. In this opinion he is followed 
by Desmarest, Blainville, and Cuvier. Indeed, as Desmarest 
says, the fossil animal Megalonyx} makes the direct transition 
from the Sloth to the Ant-Eater; while on the other hand, the 
genus Echidna, which was described first by Shaw as a Myrme- 
cophaga, and then by Home as an Ornithorhynchus, is universally 
now allowed to be the link between these two genera. A number 
of circumstances have made naturalists consider the Ornitho- 
* M. de Blainville, both in the Budi. de la Soc. Phil. 1816, and in the 3rd table of 
his Principes d’ Anatomie Comparée, calls them, Quadrumanes Anomaux organisés 
pour grimper. 
+ Inthe Lecons d’ Anatomie Comparée, M. Cuvier makes his family of Tardigrades to 
be the means of transition from the Edentés to his Pachydermes. In the Régne Animal, 
he places them among the Edentés, with the remark, that the whole of this group are 
furnished with “de gros ongles qui embrassent l’extremité des doigts, et se rap- 
prochent plus ou moins de la nature des Sabots.” Linnzus, as it is well known, 
placed them among his Bruta, with the Elephant and Rhinoceros. 
{ See Art. Megatherium, Dict. d’Hist. Nat. 
rhynchus 
