282 Mr. A. S. Woodward on the Dentition of Ji\\moY)iera. 



explanation it may some time afford of such a relic possibly 

 to be met with among the fossil species. Having in this 

 respect a bearing upon certain pala3ontological studies, of 

 which the results will shortly appear, Dr. Giinther has kindly 

 given me the opportunity of examining the specimen, and its 

 main peculiarities are shown in the accompanying woodcut. 

 It is evidently referable to the Brazilian species B. Jussieut, 

 and probably represents an adult individual. 



I 



The largest series of teeth (O a) is neither symmetrical 

 nor centrally placed, one extremity of each tooth being 

 bevelled at a much more acute angle than the other. Flank- 

 ing this series there are four rows on one side and no less 

 than eight on the opposite, there being thus a marked depar- 

 ture from the usual symmetry observed in the dentition of the 

 genus. The four roAvs of lateral teeth are evidently normal, 

 the innermost (I) exhibiting the ordinary transverse elonga- 

 tion — slightly more than three times as long as broad — and 

 the three outer (II, III, IV) being more or less irregularly 

 diamond-shaped. On the other side the largest teeth are 

 those of the fifth row (I c), which have on an average a 

 breadth equal to once and a half their length. Outside tliis 

 series are three rows of irregularly diamond-shaped teeth 

 (II, III, IV) of nearly the same character as those of the 

 opposite side, though slightly narrower. Between the same 

 series and the largest mesial teeth are four rows, the compo- 

 nents of the first {Ob), third (la), and fourth (I^) being 

 almost symmetrical and as broad as long, while those of the 

 second row (O c) are longer than broad and have the outer 

 angle much more acute and produced than the inner. 



