186 Messrs. Hancock & Atthey on Anthracosaurus Russelli 



tusk is crushed down close to the posterior margin of the 

 specimen, with its base near its proper position, not far from 

 the maxilla, and the apex pointing inwards : it is broken 

 across near to the middle ; and the basal portion overlies, to 

 some extent, the upper part. When perfect, this tusk could 

 not be less than two inches long, and is about an inch wide 

 at the base. 



Four teeth, upwards of half an inch long, lie upon the base 

 of this large tusk, and another, about the same size, lies 

 pressed down a little in front of it ; these have their bases 

 attached to the maxilla, and are the only maxillary teeth of 

 this side, a very small portion of the maxilla being present. 

 In front of these teeth a short space intervenes between them 

 and the base of a large tooth, which stands erect, and is ^ inch 

 in diameter ; the crown lies pressed down in contact with the 

 basal portion, and with it measures nearly an inch in length. 

 A large depression is immediately in advance of this tooth, 

 separating it from two other teeth equally large, or, perhaps, 

 a little larger, which are crushed down confusedly, one over 

 the other, at the anterior extremity of the specimen. These 

 three large teeth would seem to belong to the priemaxilla. 

 The teeth of the maxilla of the right side are well displayed ; 

 they stand up, for the most part arranged along the alveolar 

 ridge with their crowns (some of which are perfect) inclined 

 backward and inward. There are thirteen of these teeth ; 

 they vary somewhat in size, and commence in front in a line 

 with the base of the vomerine tusk. The first seven are placed 

 close together ; the first and seventh are larger than the rest, 

 and are \ inch wide at the base ; two or three of the smaller 

 have the crown complete ; when perfect, the large ones must 

 have been upwards of half an inch long. A short space now 

 intervenes in the series, and then there is a cluster of four 

 more teeth, three of which are rather large and one small, the 

 latter being placed between the first and second of the three ; 

 all their crowns are broken ofi"; the bases of the three larger 

 measure | inch in diameter. Behind these is a large depres- 

 sion ; and then the series is terminated by the two last teeth, 

 the twelfth and thirteenth, which are placed near to each 

 other. All that remains of the former is a very short stump, 

 almost I inch in diameter; the latter is apparently quite 

 small, and is represented by a mere fragment, which is placed 

 close to the fractured margin of the specimen. 



In number and size the teeth do not exactly correspond to 

 those of the specimen from the Lanarkshire coal-field described 

 by Prof. Huxley * ; but the disparity in these respects does 

 * Journal of the Geological Soc. vol. xix. p. 56, 1863. 



