395 



of the other pachydermata on one side, and those of the ruminating 

 animals on the other. On referring to the hind-foot of Anoplotherium 

 commune, which he found to occupy a similar place between the pachy- 

 dermata and ruminating animals, he was led to conclude that this fore- 

 foot belonged to the same animal ; a conjecture in which he was com- 

 pletely confirmed, by the examination of another specimen. From the 

 examination of other fragments, he had also the satisfaction of making 

 out, that the bones of which they were composed had formed the fore- 

 foot of Anoplotherium minus. 



He thus obtained the parts of at least three fore-feet, answering to 

 the three hind-feet, and to the sorts of jaws before described. He was 

 not so successful as to Anoplotherium minimum ; he however found suffi- 

 cient reason for exultation, at having been able to carry his discoveries 

 thus far, considering the difficulty of such investigations. The reader, 

 he observes, may form an idea of it, when he learns, that it required six 

 years to collect and combine the materials of the inquiry respecting the 

 fore-feet of this genus. 



In the former part of this letter, you will have observed that two 

 distinct sets of bones of the upper extremities were found, in one set of 

 which the radius had two depressions, and the lower head of the hu- 

 merus two corresponding eminences, and in the other the radius had 

 three depressions, and the corresponding surface of the humerus three 

 eminences. The former of these were determined to belong to the genus 

 Palaotherium ; and a very careful investigation determined, that the lat- 

 ter set belonged to the genus Anoplotherium* No specimens of the ulna 

 were found sufficiently perfect to allow of any satisfactory comparisons. 



The scapula, mentioned in the former part of this letter as belonging 

 to the animals of this genus, possessed an acromion ; the spine projecting 

 more in the fore part than in the rest of its length, gives out an isolated 

 production, which is also directed forwards. A curious agreement here 

 offers itself to our observation. The pachydermata and the solipeds have 

 no trace of an acromion; and in the ruminants, although the spine pro- 



