In complete confirmation of the propriety of the previous arrange- 

 ment which had been made of the separate bones, this specimen 

 showed that the number of ribs was twelve, again pointing out that 

 analogy with the camel which had been already seen in several of 

 the other bones. But the most novel, and at the same time the most 

 unexpected character, demonstrated by this specimen, was, the vast mag- 

 nitude of the tail, which had at least twenty-two vertebrae, and which 

 equalled, if it did not even surpass, the body in length. From the thick- 

 ness of its vertebrae, and the projection of their apophyses, it is evident 

 that the muscles of the tail must also have been of considerable size ; and 

 indeed the traces left on the stone give reason for concluding that the 

 thickness of the tail of this animal must have been as enormous as its 

 length. 



Soon after making the necessary remarks on the preceding specimen, 

 M. Cuvier obtained part of a second skeleton of the same animal, found 

 in the quarries of Antony. The quarries of this part are nearly a hun- 

 dred feet under ground, and descend at least fifty or sixty feet under the 

 river de Bievre. The principal mass of gypsum, which occupies the bot- 

 tom of the quarry, is about eight feet thick, and is covered by a great 

 number of beds of different kinds of marl, intermixed with some small 

 beds of gypsum, in one of which this skeleton was found. 



From this skeleton, also, much important information was obtained 

 respecting this animal; particularly, that -the number of incisive teeth is 

 six : the lumbar vertebrae also six ; the transverses processe of which, 

 particularly of the four last, being extremely long and wide : the sacral 

 vertebras three, all very strong, and provided with very large apophyses, 

 such as would have been necessary for supporting the enormous tail of 

 this animal. The fore-foot was also found almost whole, and possessed 

 precisely the characters which had been supposed, from a view of the 

 separate bones. 



When the complicated form of a vertebra, with its various cavities and 



