68 Annals of the Carnegie Museum. 



and heel as in Biinomeryx. Protocone and protoconule united into a 

 cross-crest on M- and M-. P-g- ivith distinct internal tubercle; P4- with 

 deuteroconid, antero-internal tubercle, and heel as in Bunomeryx, and a 

 greater advance towards the selenodont pattern of the inferior molars than 

 in Homacodon. 



The principal differences between Bunomeryx and Hylomeryx are as 

 follows: the antero-external angle of M- and M- is more developed, 

 giving these teeth a more perfectly quadrate outline in the present 

 genus. Furthermore there is present in Hylomeryx a distinct hypocone 

 on M- as in Homacodon, while in Bunomeryx there is no hypocone. 

 P- and P~ of Hylomeryx are apparently also proportionally larger. 



15. Hylomeryx annectens sp. nov. (Plate XXXVI, Figs. 5-6). 

 General Description of the Material Constituting the Type. 



The skull is considerably depressed by crushing, but it is possible 

 to make out the outline of the nasals, which are long, rather slender, 

 and extend backward to opposite the anterior border of the orbits. 

 The frontal meets the nasal in a decided zigzag cross-line on the face, 

 analogous to what is seen in such forms as Limnenetes anceps among 

 the Oreodonts or Stenofnyliis among the Cameloids. There is no 



Fig. 8. Hylomeryx anjteclens. Carnegie Museum No. 2335. X i/i. 



lachrymal pit or vacuity, and the infraorbital foramen is small and 

 located above P- as in Homacodon vagans illustrated by Dr. Sinclair.-^ 

 The anterior border of the orbit is opposite the median portion of M-. 

 When the skull in its present crushed condition is considered, it is 

 possible to imagine that it, when normal, was similar to that of Homa- 

 codon in the specimen illustrated by Sinclair. 



^'' Bull. Amer. Mtis. Nat. Hist., Vol. XXXIII, 1914, p. 285. Fig. 19. 



J 



