352 RHINOCEROS. 



Comparison of Minchin Skull with young Northampton Skull. 



Minchin Young 



Skull Northampton 



Across the condyles, outer angles . . . 6 - 5'3 



Length, lower surface, left condyle . . . 2-65 

 Depth from lower edge, right condyle, to occipital 



crest, right side ...... 8 - 5 7'8 



Width of occipital plane near apex 6" 



Width behind orbitary (auditory ?) foramen, and 



a little above 93 8-4 



VI. — Note on Young Lower Jaws of Rhinoceros Hemi'tcechus. 

 College of Surgeons, 15th October, 1858. 



Examined a very beautiful young lower jaw, left ramus ; the greater 

 part of symphysis present with whole of horizontal ramus ; the posterior 

 angle wanting, but a part of the ascending ramus present ; what there 

 is of it reclines, but of the posterior lower part the whole is restored in 

 plaster. What remains of the ramus agrees with the next specimen. 

 It is from Minchin Hole, and has two foramina near symphysis, like the 

 other specimens. It contains the deciduous dentition quite perfect, and 

 all emerged, namely, 1st, 2nd, 3rd, and 4th milk molars; all more or 

 less worn, except the first, which is perfectly entire. In form it resem- 

 bles exceedingly the figure in Owen's ' British Fossil Mammalia,' Cuts 

 128 and 137 of the young jaw, from Lawford, confirming the impression 

 that the latter is also a milk specimen. Strange to say, the first tooth 

 is unworn. (See PI. XXV. fig. 1.) 



Dimensions.— Length of the four m.m. 5-2 in. ; of 1 m.m., 0/8 in. ; of 2 m.m., 1-1 

 in. ; of 3 m.m., 1*6 in. ; of 4 m.m., l - 7 in. 



Another specimen, also from Minchin Plole, is the right ramus of the 

 same animal. It is less perfect, and contains the 2nd, 3rd, and 4th 

 milk molars, and the alveolus of a 1st, — a single pit of perhaps two con- 

 fluent fangs. The symphysis has been partly restored, and does not fit 

 to the left ramus. 



Further, compared the first milk molar of the left jaw with Owen's 

 figure (Cut 137, p. 363) ; the latter is of the inside apparently ; they 

 agree to the minutest particulars. Can the real Rugby specimen really 

 be of Rhin. priscusl (R. hemitcechus. See antca, p. 348.) 



Compared the third specimen of lower jaw from Minchin ; a little 

 older. It is superb; comprising the whole of the horizontal ramus and 

 symphysis, with the ascending ramus and the greater part of the condyle ; 

 surface eroded, and the coronoid broken off obliquely down in a line 

 with sigmoid notch ; the ascending ramus reclines exactly as in R. 

 tichorhinus, but the contour of the lower jaw is decidedly different. 

 There is no abrupt step of ascent, as R. tichorhinus. There is more 

 convexity below, but the curve is gradual in front, as in R. bicornis, 

 the ramus of which also reclines much. 



VII. — Notes on Milk Dentition of R. Hemitcechus. 



College of Surgeons, August 6, 1859. 



Examined two milk molars (second and third), fitting together, of 

 R, hemilcechus, from Colonel Wood (Minchin Hole). They are very 

 fine, though well worn. There is also a detached shell in germ of the 

 second milk molar, right side, quite intact, and with the enamel only 



