703 
1908-9.] The Skeleton of a Sowerby’s Whale. 
the other articulated with M m and M IV , and represented without doubt C 4 , 
though possibly also C 5 was fused with it, as no separate C 5 was present. 
On the radial side of C 2 + C 3 a bone which I regarded as C x was in series 
with the radiale and the pollex. The pisiform cartilage was unossified, and 
there was no sign of an os centrale. The metacarpals were five in number, 
and that of the fifth articulated with the ulnare. The metacarpals and 
phalanges had proximal and distal epiphyses, but the phalanges of the 
pollex and minimus were not ossified. 
Fig. 5. — Radiogram of flipper of Delphinus acutus. 
Kiikenthal has described an embryo of this dolphin 45 ‘5 cm. long, in 
which he recognised two cartilaginous distal carpalia comparable with the 
relatively large bones above described. A third cartilage distal to the 
radiale similar to my carpale x was present, but Kiikenthal left it an open 
question whether it should be regarded as carpalej or the metacarpal of 
the pollex ; in the latter case carpale 1 had either disappeared or become 
fused with the radiale. 
I suggest the following formula for the hand of Delphinus acutus : — 
Min. Ann. Med. Index. Pollex. 
Ph Ph 3 Ph 5 Ph 8 Ph 
My Miv Mm Mu Mi 
pis. 
cart. 
ulnare intermedium radiale 
Ulna Radius 
Lagenorhynchus albirostris (. Delphinus albirostris). 
In 1888 I obtained an adult female white-beaked dolphin, and had the 
skeleton mounted in the Anatomical Museum. The manus was carefully 
dissected. The radial and ulnar epiphyses and the metacarpal and 
phalangeal epiphyses were fused with their respective shafts. The carpal 
