65 
plane. The proximal row consists of three bones besides the two 
pisiforms. At either side of the wrist is a cuneiform (Os triquetrum), 
the dorsal surface of which is uncommonly large. Between them is 
a bone which evidently is the result of the fusion of two semilunars. 
Its upper border is slightly notched. The pisiforms in the tendons 
of the ulnar flexors are displaced above the wrist on to the ulnae. 
Extension of the hand would have brought them on to the cuneiform 
bones. At each end of the second row there is an unciform bearing 
the little and ring fingers. Each rests on the corresponding cuneiform 
and touches the semilunar. Next come the two ossa magna, very 
symmetrically disposed, each bearing the metacarpal bone of the middle 
finger. Their anterior halves diverge so as to leave an interval between 
them, behind which they touch 
each other, their heads resting 
side by side in the middle 
Fig. 4. 
bone of the first row. In the 
notch between these bones is \ 
the trapezoid (Os multangu- 
lum minus) bearing the left Ga) 
index finger. Each middle N 
finger touches it, the extra one * 
by a broader surface than the 
normal one of the left hand. 
Still it is very symmetrically 
Fig. 4. Diagram of the dorsal 
aspect of the wrist. 
placed, so that from a view of the carpus alone it would be 
very hard to say to which side it belongs, but a glance at the 
specimen or at the cast is enough to show that the index finger 
belongs to the left hand. The metacarpal bones and phalanges require 
no special description. Those of the extra hand are somewhat smaller 
than the normal one. 
The Muscles. The description of the muscles is necessarily 
complicated. The former account was not satisfactory. The study 
of the dried and distorted bands was difficult, and the results often 
uncertain. In this abstract only the most important facts are given. 
There seem to be two rather imperfect biceps muscles, which are 
inserted into the extra internal condyle on the front of the humerus 
5 
