

RHINOCEROS ETKUSCUS. 355 



outer surface as to the valley broken off. There is a little mammilla 

 between the barrels of the first and second true molars. In the third 

 and fourth p.m. the end of the valley is only a very slight cleft ; in the 

 true molars it is an open flexuous fissure. 



Dimensions. — Length of 5 teeth (2nd p.m. to end of 2nd t.m.), 7'5 in. Length 

 of 2nd tin. at middle, 1-85 in. Width in front, 2-2 in. 



Can this really be from the Sub-Apennines ? 



II. — Comparison of Ehinoceros of Norwich Lacustrines with 

 ' Venice ' Upper Jaw in Oxford Museum. 



1th May, 1858. 



Compared the Rev. Mr. Gunn's detached upper molar (PI. XXTI. 

 fig. 5) from the Norwich lacustrines with the upper jaw labelled ' Eh. 

 leptorhinus from Venice ' in Buckland's collection, and found the most 

 important agreement. Gunn's also belongs to the left side. In form 

 Gunn's would agree best with the last premolar from the smaller size 

 of the posterior barrel, but unluckily the fracture of the outer surface 

 of the Venice fossil prevents a rigid comparison. They agree in the 

 following important points : — 1. Exact similarity of smooth enamel 

 surface. 2. Decided anterior basal bourrelet, worn down in Gunn's. 

 3. Like thinness of enamel. 4. Sweep antero-posteriorly of termina- 

 tion of large valley, and its nearly isolated form. 5. Openness of 

 gorge of transverse valley. 



Dimensions. 



Length of outer side at constriction 

 Length of inner side 

 Breadth near middle, anterior barrel 

 Breadth behind, at base of crown . 



Length of outer side (greatest) 



Length at constriction . 



Length of inner side 



Breadth of middle, anterior barrel 



Breadth behind at base . 



Height of enamel crown, posteriorly 



Norwich, July, 1863. 



Examined the Rhinoceros jaw in Fitch's collection. It belongs to 

 E. Etruscus. M. Lartet detected in it the remains of the lame men- 

 tary foramina. ' Got at Anderson's the fisherman's a portion without 

 ends of a femur of an old E. Etruscus, very characteristic' 



III. — Description of Crania of R. Etruscus in the Grand Ducal 

 Museum at Florence (Plates XXVI. and XXVIL). 



18th May, 1859. 



In the Museum at Florence is'preserved a superb skull of Rhinoceros 

 Etruscus from the Val d'Arno, nearly entire ; two-horned, and very 

 old. There are six molars on either side, of which even the last is 

 worn to the base. The skull is very little crushed, and there are very 

 few restorations. The nasals are perfect to their very tips on one side, 



a a 2 



