1902.] OF THE SHOET-NOSED SPERM-WHALE. 61 



The distal epiphysial cartilage of the radius is produced along the 

 outer sides of the carpus up to the metacarpal of the first digit, 

 so as almost to suggest a carpal ; but as each of the true carpals 

 has its own cartilage around it, this prolongation seems to have 

 some other significance. 



The carpal bones are five in number, three belonging to the 

 proximal row, and two to the distal series. Each is an irregular 

 polygonal, more or less hexagonal, disc of bone embedded in 

 its own cartilage. Each bone has vertical sides, without the 

 "shelf" and without the epiphysis which exist in Physeter, to 

 which, otherwise, they bear considerable resemblance. The 

 pisiform is entirely cartilaginous. In the digits, each phalanx 

 is provided with its own independent cartilaginous epiphysis at 

 each end, as in Odontocetes generally. The metacarpals are 

 short, not much longer than the proximal phalanx in each digit. 

 That of the first digit is, as in Physeter, rounded and somewhat 

 like a carpal ; but Flower has given reasons for regarding this 

 as a metacax-pal, and the fifth metacarpal is also rounded. The 

 relative lengths of the digits, in ascending order, are I., V., IV., 

 III., II. 



The number of phalanges is accurately shown in the drawing ; 

 whereas in the previously published figures some of the terminal, 

 very small phalanges are missing. 



The first digit possesses two phalanges ; 

 „ second „ ,, ten „ 



„ third „ „ seven „ 



„ fourth „ „ six ,, 



„ fifth „ „ three „ 

 These numbers refer to the right limb ; on the left the second 

 digit has only nine and the fifth only tw^o phalanges. 



It will be noted that the two to fovir terminal phalanges of the 

 longer digits are more or less circular, as are all three of the fifth 

 digit. 



Measurements. 



millim. 



Total length 372 



Humerus : — Length (incl. cartilage) 95 



„ „ shaft only 65 



Transverse diameter of shaft at upper end 45 



„ „ „ lower end 50 



Girth, in its middle 101 



Thickness 24 



Radius : — Length along preaxial border 75 



„ ,, postaxial border 60 



„ of bone only (in middle line) 60 



Least breadth 30 



„ thickness 12 



Ulna : — Total length along postaxial border 63 



,, „ ,, preaxial border 60 



„ „ of bone (middle) 55 



Least breadth 26 



,, thickness 10 



