1891 - 92 .] Prof. Sir Wm. Turner on the Lesser Borgital. 
71 
with the ulnare, and slightly with the base of the metacarpal segment 
of digit d. 
The distal row of carpalia, mesocarp 2 ts, consisted of only two 
hones, which were cut off from the two lateral margins of the carpus 
by the metacarpal segments of digits a and rZ, which passed to 
articulate the one with the radiale, the other with the ulnare. As 
there may he some difficulty in arriving at a conclusion, which of 
the five carpalia of the distal row of the type cetacean carpus are 
represented by these bones, I shall not designate them numerically, 
but distinguish them as Ca, C^. The transverse diameter of the 
bony part of each was about 2 inches. Ca articulated, proximally 
with the radiale and intermedium ] distally with the metacarpal of 
digit h ; radially with the metacarpal of digit a ; by its ulnar sur- 
face with Cp. C/3 articulated, proximally with the intermedium 
and ulnare ; distally with the metacarpal of digit c j radially with 
Ca ; on the ulnar side with the metacarpal of digit d. 
The metacarpal segments of the four digits articulated as follows : — 
a with radiale and Ca ; h with Ca ; c with Cy8 ; d with CyS, ulnare 
and pisiform. In addition to the metacarpal segments the digits 
were furnished with phalanges as follows : — a with three ; h with 
seven; c with six; d with three. Each metacarpal bone and 
osseous phalanx had cartilage both at the distal and proximal ends, 
wffiilst the cartilage at the metacarpo-phalangeal joints and the 
larger inter-phalangeal joints was divided into two epiphysial plates, 
one for each bone ; that between the 4th and 5th and 5th and 6th 
phalanges of digits h and c consisted of a single bar, not transversely 
segmented. Each terminal osseous phalanx had at its distal end a 
flattened plate of cartilage. Digit h was the longest, its terminal 
phalanx, in proximity to the tip of the flipper, was so small a plate 
of bone that unless care had been taken in dissecting the part it 
might easily have been missed. Digits a, 5, and c were parallel and 
close to each other. Digit d diverged somewhat from c, so that the 
interval between them was greater than that between the other 
digits. The terminal phalanx of digit d reached the ulnar border 
of the flipper. 
The dried manus of Knox’s young specimen was examined, when 
three osseous nodules were seen to represent the radiale, intermedium, 
and ulnare ; two nodules represented the bones of the distal row, and 
