559 Mr. Yarrell on the Osteologi/ 



plantigrade. Various admeasurements of these and other parts 

 will be found in Dr. Harlan's account, and need not therefore 

 be repeated. 



From these detailed observations, with representations of the 

 whole skeleton, and its different parts, it will be perceived that 

 the Chlamyphorus truncatus has points of resemblance to several 

 other quadrupeds, but that it possesses also, upon each compari-. 

 ' son, many others in which it is totally different. It resembles 

 the Beaver, (Castor Fiber j) in the form and substance of some 

 of the bones of the limbs, in the flattened and dilated extremity 

 of the tail, and the elongation of the transverse processes of the 

 lower caudal vertebrae, but no further. 



It has much less real resemblance to the Mole, (Talpa Eurom 

 petty) than its external form and subterranean habits would induce 

 us to expect. In the shortness and great strength of the legs, and 

 in the articulation of the claws to the first phalanges of the toes, 

 it is similar ; but in the form of the bones of the anterior extre- 

 mity, as well as in the compressed claws, it is perfectly different ; 

 nor do the articulations of the bones, nor the arrangement of 

 the muscles, allow any of the lateral motion so conspicuous in 

 the Mole. The hinder extremities of the Chlamyphorus are also 

 much more powerful. 



It resembles the Bradypus tridactylus in the form of the 

 teeth, and in the acute descending process of the zygoma, but 

 here all comparison with the Sloth ceases. 



The skeleton of the Chlamyphorus will be found to resemble 

 that of the Armadillo (Dasypi species plures) more than any other 

 known quadruped. In the peculiar ossification of the cervical 

 vertebrae ; in possessing the sesamoid bones of the feet ; in the 

 general form of all the bones, except those of the pelvis, as well 

 as in the nature of the external covering, they are decidedly 

 similar ; they differ however in the form and appendages of the 

 head, in the composition and arrangement of the coat of mail, 

 and particularly in the posterior truncated extremity and tail. 



There is a resemblance to be perceived in the form of some of 

 the bones of the Chlamyphorus to those of the Orycteropus 

 Capensis and Myrmecophaga jubaia, as might be expected in 



