On the Angwantibo of Old Calabar. 185 
inch ; and the third about ths of an inch. Free extremity 
|ths of an inch. 
Span, 1 inch and j%ths of an inch. 
Posterior Limbs : — 
Length of Thigh, 2 J inches ; of Leg, 2J inches. 
Foot, from ankle-joint to point of longest finger or toe — the 
fourth, IJ inch. Tarsus, not elongated, about J an inch in 
length. Metatarsal bones measure from i\ths to j\ths of an 
inch in length. 
The first phalanges (with the exception of the thumb), like 
those of the hand, are conjoined together. 
Thumb or First Finger. — Thumb with metatarsal bone, 
about l^ths of an inch long. First phalanx, x^ths of an inch ; 
second, y^ths of an inch. 
Length of Second Finger, 1 inch ; first phalanx, nearly 
fths of an inch ; second phalanx, x\ths of an inch ; third 
phalanx, bone of claw, i\ths of an inch ; claw itself, x^ths 
of an inch. Free extremity, J an inch. 
Length of Third Finger, first phalanx, j^Qihs of an inch ; 
second phalanx, x%ths of an inch ; third phalanx, j\ths of an 
inch ; third finger smaller than the fifth, and free about fths 
of an inch. 
Length of Fourth Finger, first phalanx, fths of an inch ; 
second phalanx, fths of an inch ; third phalanx, x\ths of an 
inch ; fourth finger longest, free about ^ an inch. 
Length of Fifth Finger, first phalanx, f%ihs of an inch ; 
second phalanx, ^ths of an inch ; third phalanx, nearly 
x\ths of an inch. Larger than third finger, being inter- 
mediate between it and the fourth, and free for about fths of 
an inch. 
Span measures nearly 2 inches in length. 
This animal possesses a clavicle. The stomach is moderate, 
in size, and rounded in form, and contained what seemed to be 
digested vegetable matters. It has a large sacculated coecum 
of about IJths inch in length. 
Microscopic Structure of the Hair of Angwantibo. — 
It occurred to me to examine through the microscope some of 
the hairs of this little animal ; and I was much struck by their 
