230 T7NGULATA. 



Fig. 32. 



Hyopotamus porcinus. The first and second left lower true molars ; from the 

 Hempstead beds of the Isle of Wight. \. 



distinguished from those of H. bovinus by their smaller 

 size and much lower cusps ; they are considerably smaller 

 than the teeth from the same locality provisionally re- 

 ferred to Anthracotherium minus (infra, p. 242), but agree 

 very closely in general characters, though the cusps are 

 perhaps slightly higher ; they present no characters by 

 which they can be genetically distinguished from Anthra- 

 cotherium. The dimensions of m. 1 are 0,0136 x 0,0095 ; 

 and those of mT2 0,0163 x 0,0114. 



Hastings Collection. Purchased, 1855. 



36812 b. Fragment of the left ramus of the mandible, containing 

 m. 3 in an early condition of wear ; from the Hempstead 

 beds of the Isle of Wight. The length of this tooth is 

 0,0255. Presented by S. Laing, Esq., 1862. 



36812 C. The third right lower true molar, in an unworn condition 

 and wanting the third lobe ; from the Hempstead beds of 

 the Isle of Wight. Presented by S. Laing, Esq., 1862. 



40209 a. Fragment of the left ramus of the mandible, containing 

 m. 2 and m. 3, in a much-worn condition ; from the Hemp- 

 stead beds of the Isle of Wight. 



Hastings Collection. Purchased, 1855. 



Limb-bones of AnthracotheriidaD from the Hempstead beds of 

 the Isle of Wight. 



It is probable thajb the majority of these bones belong to Hyopo- 

 tamus, and the larger specimens to H. bovinus. In the presence, 

 however, of two genera and several species of Anthracotheriidce in 

 the Hempstead beds, it appears unadvisable in many cases to make 

 any definite specific references. 



