704 
Proceedings of the Royal Society of Edinburgh. [Sess. 
bones were fully ossified. In the procarpus the radiale, with a transverse 
diameter 25 mm., articulated with radius, with a distal carpal which I 
regard as C 0 + 3 , and with metacarpals 1 and n. The intermedium 30 mm. 
wide articulated with radius, ulna, ulnare and the two distal carpalia. The 
ulnare 24 mm. wide articulated with ulna, intermedium, distal carpale 4 , 
with the metacarpal of digit Y, but was separated from M IV by an interval 
occupied by cartilage. 
The distal row of the carpus contained only two bones. The larger was 
wedged between and separated the radiale and intermedium from each 
Fig. 6. — Left manus, dorsal surface, Lagenorhynchus albirostris. 
other ; it was 27 mm. wide, and articulated with both these bones, slightly 
with the carpal end of the radius, extensively with metacarpals n and ni> 
and also with the smaller disto-carpal ; it was obviously carpale 2 + s 
fused together. The intermedium and the larger carpale were marked 
by a shallow groove on both palmar and dorsal surfaces, which was 
in line with the interosseous space in the forearm and with the interval 
between Mu and M m ; the groove was doubtless for a tendon, or an 
artery. The smaller carpale was 24 mm. wide and articulated with 
intermedium, ulnare, almost equally with M m and M IV , and with the 
larger disto-carpal e ; to its ulnar side a piece of unossified cartilage separated 
it from M v ; it is marked C 4 in fig. 6 , and the unossified cartilage may 
represent an undeveloped C 5 . A plate of pisiform cartilage was at the 
ulnar border of the carpus, and extended from the lower end of the ulna 
