204 DR. J. E. GRAY ON A NEW SPECIES OF BUSH-GOAT. [Feb. 14, 
blunt waves of growth. The shell was sent me as from Dr. Forbes’s 
Vancouver collections, and is so quoted in the Br. Assoc. Rep. 1863, 
p- 607; but Mr. Cuming subsequently stated his belief that it came 
from Japan. It may be allowable to state that many of the species 
iucluded in Saxidomus by authors are more correctly rough forms of 
Tapes, of the decussata-type; the true Saxidomi differing from that 
genus (as Callista does from Venus) in having an additional pseudo- 
lateral anterior tooth. This is very evident in the young shell, which 
has a much rounder outline than the adult, and can scarcely be 
distinguished from Callista, except by the absence of lunule. 
4. Notice or THE SKULL or A New Species or Busu-Goat 
(CEPHALOPHUS LONGICEPS), SENT FROM THE GABOON BY 
M. Du Cuaituv. By Dr. J. E. Gray. ' 
M. Du Chaillu has lately sent to the British Museum several skins 
and skeletons of the Gorilla (showing how abundant it must be at 
the Gaboon), the skin and skeleton of a Chimpanzee, three skeletons 
of the African Manatee, and the head of a Bush-Goat or Cephalo- 
hus. 
: The skull of the Cephalophus on examination proves quite distinct 
from any that has previously occurred to me ; and as it indicates the 
existence of a large species of the genus, I have sent a notice of it to 
the Society in hope that we may before very long have a complete 
specimen of the animal to describe. 
CEPHALOPHUS. 
Section I. Horns decumbent. 
CEPHALOPHUS LONGICEPS. 
The skull elongate ; face elongate, compressed in front of the 
eyes; the nose in front of the eyes narrow, sides only very slightly 
tapering ; nasal bone very long, produced between the frontal be- 
hind, much longer than the medial suture of the frontal. The horns 
elongate, conical, diverging at the tips, decumbent, in a line with the 
forehead ; forehead convex between the orbits. 
Length of skull 10 inches 9 lines; width at zygoma 4 inches 
7 lines ; length of horn-cores 5 inches ; length of lower jaw 9 inches. 
The only species with which the th ae be compared, on ac- 
count of its size, is C. sylvicultriz ; but the skull of the latter is 
short and ventricose, and that of C. longiceps is elongate and slen- 
der. The face of C. sylvicultriz is short, and the nose between the 
impression for the suborbital glands broad and tapering ; the fore- 
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 
