340 KH1NOCEEOS. 



iii Italy, left it as a behest to the naturalists of that country, 

 to supply the deficiency. But nothing adequate to the de- 

 mands of the subject has as yet been accomplished by them, 

 and there is hardly extant a single good figure or description 

 of an authentic upper molar of that form, to serve as a 

 standard of comparison ; while of lower jaws, besides the 

 figures in the ' Ossemens Fossiles,' there exist in the Palseon- 

 toloerical series of the British Museum several fragments 

 containing teeth, from the Val d'Arno, furnishing the desired 

 means in so far as the mandible is concerned. 



Figs. 1 and 2 of PI. XIX. represent the greater portion of 

 the horizontal ramus of the lower jaw, left side, of B. hemi- 

 toechus, containing the full series usually seen in the adult, of 

 six molars. The crowns are in the stage of wear best suited 

 to show all the characters, the last true molar, although 

 abraded, having the divisions distinct. The specimen be- 

 longs to the Swansea Museum. Figs. 1 and 2 of PL XX. 

 represent a fragment of a left ramus of equal extent, showing 

 the five last molars in situ, and the empty alveolus of the 

 antepenultimate premolar. The wear of the crowns had 

 advanced so far in this specimen, that the four anterior 

 teeth are ground down each to a uniform disc of ivory. Both 

 specimens are from Mincbin Hole, and belong to the collec- 

 tion of Colonel Wood. 



Fig. 1 of PI. XXI. represents a mutilated right ramus of 

 the lower jaw, exhibiting also the six posterior molars in sihi, 

 together with a portion of the syniphysial expansion. The 

 specimen is remarkable, in showing the abnormal condition 

 of two collateral teeth, for the last premolar. The crowns 

 are seen in the early stage of abrasion of the adult animal. 

 The specimen, discovered in ' Bacon Hole,' was presented to 

 the Swansea Museum by Colonel Wood. Its dimensions are : — 



Extreme length of 6 molars (very nearly), 10-0 in. Ditto of last three molars (to 

 base), 5'97 in. Ditto of 3 anterior ditto, 4'0 in. Ditto of summit of crown last molar, 

 inner side, from edge to edge of enamel, 1*8 in. Ditto of crown near base, 2 - 18 in. 

 Ditto of penultimate crown, 1*95 in. Width of ditto behind, 125 in. Width of 

 ditto in front, 1- in. Extreme width of last molar, 1-3 in. Extreme length of 

 fragment, 12 - 5 in. Height of jaw inside, behind last molar, ±- in. Ditto in front 

 of last premolar, 3'1 in. Length of summit of antepenultimate true molar (first), 

 1-7 in. Width of ditto behind, 1-2 in. 



The first character that strikes the eye in the teeth of all 

 the three specimens is the very thick layer of cement. In 

 PI. XX. the last true molar is completely encased in it ; 

 while the other teeth are more or less denuded, they show 

 by the fractured edging that this has arisen from accident. 

 The same appearance is presented by the molars of PI. XIX., 

 which are still more bared. The layer of cement, therefore, 



