Kneeland on the Skeleton of the Great Chimpanzée. 331 
inner orbitar angles of the frontals seems to confirm Dr. Wy- 
man's opinion, that it is an independent piece, having its own 
centre of ossification; the foramen existing midway between 
the incisive foramen of each side and the edge of the alveo- 
lus, on the left side is replaced by two, as in the Chimpanzée. 
The zygomatic arches are exceedingly strong, much more so 
than in our other specimen, inclosing temporal muscles which 
might easily account for the tremendous strength of the jaws. 
The other anatomical peculiarities of the cranium and face 
have been sufficiently detailed by Dr. J. Wyman in the fifth 
Volume of the Society’s Journal, (p. 426.) The following 
points are interesting : — The dental formula is the same as in 
man; the median upper incisors are twice the size of the 
lateral, the reverse of which is the case in the lower jaw; they 
are also respectively longer, giving to the upper incisors a 
convex edge, and to the lower a concave one ; in the upper 
jaw there is an interval of two or three lines between the 
incisors and canines, and no interval between the latter and 
the premolars, the reverse being the case in the lower jaw, in 
Which, however, the interval is less ; the upper canines extend 
from the alveolus one inch and a half, the part within the 
alveolus being at least two inches; they are an inch broad 
and three fourths of an inch thick ; the upper canines are 
Worn anteriorly by the lower, and posteriorly by the first 
lower premolar, giving to the tooth a triangular shape, with 
an anterior, a posterior, and an internal cutting edge; the 
action of the lower premolar on the upper canine, and of the 
latter on the lower canine, produces a distinct talon, or heel, 
at the base of these teeth; the two grooves, mentioned by 
Dr. Wyman as occurring on the inner face, are not seen in 
these canines, probably from the extent of the worn surface ; 
there is the lower portion of a single groove, however, which 
is lost in the worn surface beyond. . To produce these sur- 
faces there must be some lateral motion of the jaw, which 
would not be expected from the great length of these. teeth. 
The premolars and molars agree with Owen's description in 
JOURNAL, B. S, N. H, 44 
