1891-92.] Prof. Sir Wm. Turner on the Lesser Rorqual. 
73 
hypothesis, and would need more emhryological evidence in its 
favour before it could be accepted. 
In order to make the relations of the carpal bones and digits in 
B. rostrata more clear, I have constructed a graphic formula after 
the plan pursued by H. Leboucq,* Max Weber,f and W. Kiikenthal | 
in their several memoirs on the hand in the Cetacea. Alongside of 
it I have placed a similar scheme of the hand of an adult Hyperoodon, 
in which several years ago I demonstrated for the first time in the 
cetacean carpus § the presence of five separate osseous carpalia in the 
distal row, one for each digit. In the formula of B. rostrata I have 
used the descriptive terms employed in the text, which have been 
selected because they do not commit one to any hypothesis as to 
the homology either of the distal carpalia or the digits. 
Hyperoodon.W 
2 
3 
5 
5 
1 
Ph 
Ph 
Ph 
Ph 
Ph 
M4 
M, 
M2 
C5 C, C3 C3 Cl 
pi u i r 
Ulna. Eadius. 
B. rostrata. 
3 6 7 3 
Ph Ph Ph Ph 
Mc« Me Mi, Ma 
The pelvic hones were situated at the side of and extending 
forwards in front of the anal opening. They were fully ossified ; 
one was 8 inches long, the other 8J inches. They were somewhat 
curved, and each possessed two surfaces and two borders ; the inner 
border was concave, the outer border for the most part convex. 
Bearing in mind Mr Perrin’s description that ‘‘ at the summit of the 
* Anatoinischer Anzeiger, March 1887. 
+ Morphologisches Jahrhuch, May 1888. 
X “ Die Hand der Cetaceen,” Denk. med. wissensch. Ges., zu Jena, vol. iii., 
1889. 
§ Jour, of Anat. andPhys., Oct. 1885, p. 184. 
11 In the hand of an immature male, 20J feet long, caught at Dunbar in 
November 1885, and the skeleton of which I have placed in the University 
Museum, the phalanx of digit 1 was still cartilaginous, as also was the 
terminal phalanx of digit 5. 
