702 
Proceedings of the Royal Society of Edinburgh. [Sess 
nodule was in the distal row, but in the younger specimen a piece of 
cartilage intervened on one border between C 3 + 4 and the ulnare, and 
on the other between C 3 + 4 , Miy and My : it possibly represented an 
unossified carpale 5 . Neither specimen showed an os centrale. The 
pisiform cartilage extended on the border of the carpus from the ulna to 
the fifth metacarpal. In the digits the metacarpals and phalanges had 
both proximal and distal epiphyses. M x the pollex had one phalanx ; 
Mu had seven phalanges ; M m five phalanges ; M IV , two, and M v only 
one phalanx ; owing to the absence of carpale 5 My was connected through 
the intermediate cartilage with the ulnare and was rudimentary. 
Max Weber in his very suggestive memoir “Ueber den Carpus der 
Cetaceen ” * figured the manus of this dolphin ; he considered that only 
two distal carpalia were present, which he numbered C 2 + 3 and C 4 ; they 
corresponded to the carpalia that I have named C 2 and C 3+4 , whilst the 
bone named in my description C 1 he regarded as the metacarpal of the 
pollex. Kiikenthal inclined to the same view, though he thought this bone 
might be carpale Y , or that C x might have blended with Mj, or with radiale, 
or had perhaps disappeared. 
The formula of the hand of Delphinus delphis is as follows : — 
Min. 
Ann. 
Med. 
Index. 
Pollex. 
P 
h 
Ph 2 
p h 5 
Ph 7 
Pip 
Mv 
Miy 
Mm 
Mu 
Mi 
\ 
/ 
I 
pis. 
cart. 
(C 4+3 ) c 2 
/ \ l 
c 
1 
ulnare intermedium radiale 
Ulna Radius 
Delphinus acutus (. Lagenorhynchus leucopleurus). 
In April 1906 a white-sided dolphin was stranded near Dunrobin Castle, 
and the external characters and skeleton were described by me in June of 
the same year.-j" I may refer to that description for details regarding the 
animal, and I reproduce a radiograph of one flipper (fig. 5). 
The animal was a female and was not adult, for the skeleton was im- 
perfectly ossified, and the radio-ulnar epiphyses were not fused with the 
shafts. The procarpus consisted of radiale, intermedium and ulnare. Two 
relatively large bones were present in the middle of the mesocarpus, one of 
which articulated with Mu and Mm, and obviously represented C 2 + C 3 , 
* Morphologisches Jahrbuch , May 1888, Taf. xxvii. fig. 7. 
+ Proc. Roy. Soc. Edin ., vol. xxvi. p. 310, 1906. 
