31 



M. 1379. The last right lower premolar ; from the Upper Eocene of 

 Caylux. Purchased, 1884. 



Hyaenodon (?) sp. 

 (Cf. Hycenodon indicus, Lydekker J .) 

 Hab. France and (?) India. 



The species H. indicus was founded on the evidence of a fourth 

 right lower premolar from the Pliocene Siwaliks of the Punjab, 

 India, which indicates a species of very large size. This tooth is 

 represented in the accompanying woodcut (fig. 1). At the same 



Fig. 1. 



Hyanodon indicus. The fourth right lower premolar ; from the Siwaliks of 

 Kushalghar, Punjab. Indian Museum, Calcutta. }. (From the ' Palse- 

 ontologia Indica.') 



time two other teeth, which were regarded as heing third lower 

 true molars, were described and figured (' Palaeontologia Indica,' 

 ser. 10, vol. ii. pi. xliii. figs. 5, 6), and provisionally referred to the 

 same species, although it was suggested that they might possibly 

 belong to a distinct species, or even genus. The most perfect of the 

 two Indian teeth belongs to the left side, and was described in the 

 following words, viz. : " It is divided into two distinct lobes, of 

 which the first is the stoutest : externally there is a stout cingulum 

 forming the base of the crown. Posteriorly the lower border of the 

 enamel of the crown runs suddenly upwards on both sides, nearly 

 to the summit of the hind lobe." The tooth comes nearest to " the 

 last lower true molar of Hycenodon 2 ; in some species of which (e. g. 



1 Palajontologia Indica (Mem. Geol. Surv. Ind.), ser. 10, vol. ii. p. 349 

 (1884). 



2 The tooth might be taken for the lower carnassial of a feline ; but is distin- 

 guished by the form of the lower border of the enamel, and of the worn sur- 

 faces of the summits of the lobes, by the presence of the cingulum, and the size 

 and direction of the fangs. In the large primitive felines (e.g. Mlurogale inter- 

 media) there is a hind talon to the lower carnassial. 



