Knecland on the Skeleton of the Great Chimpanzée. 343 
the left side, at about the middle of the series. They much 
resemble those of man, and form a very capacious thorax; 
they are, however, longer and thicker, and the curves less 
complicated. Some of them, like other bones, bear marks of 
old injuries. The angles of the ribs are extremely well 
marked; even the last is united both to the body and to the 
transverse process of a single vertebra. 
The humerus is about three inches longer than that of man, 
and two inches greater in circumference at the middle, the 
latter measurement being five inches ; around the middle of 
the head, horizontally, eight and one fourth inches ; greatest 
width at lower extremity four and one fourth inches. The 
bone is of very compact structure, and very heavy. It re- 
sembles that of man, but it is less twisted on itself ; the bici- 
pital groove is quite deep and wide, having on its sides very 
large tuberosities for the insertion of the powerful muscles 
indieated by the immense scapular surface of origin; the 
ridges for the attachment of the pectoralis major, latissimus 
dorsi, and teres major attest also the great strength of these mus- 
cles; unlike those of Dr. Wyman’s specimen, these bones have 
the deltoid insertion well marked, and the anterior face rather 
convex than concave, even more so than in man. Both the 
condyles, and the condyloid ridges are more developed than 
in man; the trochlear portion is less excavated, and the 
internal ridge less prominent; there is a deep groove between 
the trochlea and the surface for the head of the radius, which 
is very slight in man. The lower extremity is perforated in the 
right humeris, but not in the left; the cavity for the olecra- 
non is an inch in width and half an inch deep, while that for 
the coronoid process on the anterior surface is hardly sunk 
beneath the level of the bone; this difference is much less 
in man, 
The ulna is more curved than in man, as is also the radius; 
they curve in opposite directions, inclosing a wide space be- 
tween them; the curve of the radius begins at the tubercle, 
while the ulna is curved its whole length. The articulating 
