PHASCOLOTHERIUM. 63 



just been found and forms the subject of the following 

 sketch. 



" The ten teeth, represented in the figure accompanying 

 M. Prevost's memoir,* are evidently grinders, and some- 

 what resemble the molar teeth of my specimen, which has, 

 however, only seven grinders; and, when it was lent to 

 Dr. Buckland, they were the only teeth apparent. He, 

 however, caused the stone to be carefully scraped away, 

 and there appear, in addition, a canine tooth" (cut 20, I) 

 "and three incisors" (ib. i). "There is room also for a 

 fourth: the end of the jaw is fractured, and there are 

 traces of what may be the alveolus of a fourth incisor. 

 With this addition, the specimen would give the exact 

 number of teeth in the half of a lower jaw of a Didelphis, 

 mz., four incisors, one canine, seven grinders. The fossil, 

 which is in high preservation, is imbedded in a slab of 

 Stonesfield slate, together with Trigonice and other marine 

 exuviae ; the whole mass exhibiting the Oolitic structure in 

 the most satisfactory manner." 



" My specimen consists of the right half of a lower jaw, 

 the inside of which is presented to view. To say nothing 

 of the difference of form in the jaw-bone, M. Prevost's 

 figure gives us the representation of a portion of a lower 

 jaw with ten grinders therein : my fossil has only seven, 

 and appears to have been part of an animal generically 

 different. The teeth are distinctly separated, and those 

 who are best qualified to judge, are of opinion that the jaw 

 did not belong to a young individual. The well defined 

 ridges and decided features of the bone denote a full-grown 

 animal : the sharpness of the teeth makes it probable that 

 it was not an aged one." " As the history of this animal," 



* " PI. 18. fig. 1, 2." See ante, fig. 16. 



