714 
Proceedings of the Royal Society of Edinburgh. [Sess. 
only partially ossified ; so that this element of the carpus was not fused with 
M T , but resembled the foetus A in Leboucq’s collection, in which C x formed 
an independent unit. To its ulnar side was a well-defined bony carpal e, 
25 mm. wide, which articulated with the cartilage of C x , with the inter- 
medium, os centrale, C 4 , M n and M m ; it should be regarded as C 2 con- 
joined with C 3 . C 4 , 21 mm. wide, articulated with intermedium, ulnare, 
C 2 + 3 > M m , and M IV , also with a piece of cartilage on its disto-ulnar border 
Fig. 10. — Radiogram of manus of adult Monodon monoceros. 
which was situated between the ulnare, M IV and M v , and may possibly 
represent an unossified C 5 . Projecting from the disto-radial border of the 
intermedium, and continuous with it by a narrow neck, was a nodule of 
bone 7 mm. in transverse diameter, which articulated with the radiale, 
C 2 + 3 , and the cartilage with its nodule described as C x ; it was obviously 
an os centrale fused with the intermedium ; in its relations and intimate 
association with that bone it corresponded with the arrangement in the 
foetus B in the Leboucq collection. M x articulated with the probable 
C x and with the radiale ; M n with C x and C 2 + 3 ; M In with C 2 + 3 and C 4 ; 
