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Zoological Society , 



head is much more convex and rounded. The following are the mea- 

 surements of the skull of an adult male : — Length of skull 10 inches 

 1 line ; width at zygoma 4 inches 7 lines ; length of lower jaw 

 8 inches 9 lines. 



The skull of C. longiceps resembles in general form and some 

 other particulars the figure of the skull of the male C. altifrons, 

 figured by Dr. Peters (Reise n. Mossamb. t. 38. f. 1). But that skull 

 is not above half the size of the one here described ; and the form 

 of the core of the horns is different, the one being conical and elon- 

 gate, and the other angular and converging at the tip. 



Skull of Cephalophus longiceps. 



The skulls of the larger species of Cephalophi may be divided into 

 two groups, according to the position of the horns, as compared with 

 the frontal line. 



In some the horns are decumbent and bent back, being nearly in 

 a line with the forehead, as in Cephalophus coronatus, C. sylvicul- 

 trix, C. Ogilbyi, C. natalensis (figured in Cat. Ungulata, B.M. t. x. 

 f. 1), C. longiceps, and C. altifrons, Peters. In others the horns 

 are ascending, placed at an obtuse angle with regard to the line of 

 the forehead, as in Cephalophus Grimmius and C. ocularis of Peters 

 (Reise nach Mossambique, Saugeth. t. 39, 40). 



The forehead in all the Cephalophi with decumbent horns is con- 

 vex and rounded ; but in C. Ogilbyi it is very much rounded — more 

 than in any other species I know ; it is much higher than the base 

 of the horn. In the species which Dr. Peters has called C. altifrons it 

 does not appear to be so high as usual in the genus. In C. Grimmius, 

 with ascending horns, it is flat between the eyes. The following 

 observation is founded on the comparison of a series of skulls of 

 males: — The skulls differ in the length of the face, thus: — In C. 

 natalensis the face is short ; the distance from the orbit to the upper 

 end of the intermaxillary bone is shorter than the length of the in- 

 termaxillary bone. In C. sylvicultrix, C. Ogilbyi, and C. ocularis 

 the distance above defined and the length of the intermaxillary are 

 nearly equal. In C. Grimmius they are rather longer. In C. longi- 

 ceps the distance from the front edge of the orbit to the tip of the 



