364 MR. W. H. FLOWER ON THE OSTEOLOGY OF THE SPERM-WHALE. 
proportion to its length, and having less of the hourglass-shape, its outer border being 
nearly straight. It is followed by three phalanges, which rapidly decrease in size. 
Length of Bones of Manus. 
Tasmanian Tasmanian) Tasmanian Vorkehire 
skeleton. | No. 1. No. 2. 
inches. inches. inches, inches. 
Ist digit, metacarpal....| 22 3 24 43 
phalanges .... + 4; 33 & 3 | 33 & 23 
2nd digit, metacarpal.... + 14 5 53 
Ist phalanx ..| 5 6 4 43 
itil 55 co) at 5 3} 3 
orden: 3 22 14 
4th ,, 2 13 sor 
oth ,, call ercaaat opos 1 ait 
3rd digit, metacarpal... . Fi 64 5 53 
Ist phalanx ..| 43 6 3 43 
2nd ss, ..| 33 4h 3 4 
3rd) 5; .-| 23 3 23 23 
c 4th =, Hell Wear 13 1z tae 
5th ,, S|) aera Z ab OAD 
4th digit, metacarpal....] 43 6 43 43 
Ist phalanx ..| 4 5} 3t 4 
Drill Gees eile 33 2} 33 
ail A oe 2 23 2 13 
Ath ~,; el onsets 13 1j ote 
5th digit, metacarpal... . 43 5? 4 43 
Ist phalanx .. Ff 34 23 3 
2nd, ae 23 23 2 
3rd, 5 1 eae 
Pelvis. 
In all known Toothed Whales the sole rudiment of a pelvis is formed by a pair of 
elongated subcylindrical bones (ossa ischia) placed horizontally and nearly parallel to 
the vertebral column*, opposite to the junction of the lumbar and caudal regions, and 
giving support to the crura of the penis or clitoris, as the case may be. In no species 
of this group have any such accessory bones or cartilages representing the hinder 
extremities, as those discovered by Reinhardt in Balewna mysticetus, and subsequently 
by other observers in several of the Whalebone- Whales}, been hitherto observed. It 
must be remarked, however, that they have never been looked for with much care in 
any of the larger members of the group, as the Cachalot or Hyperoodon. 
The description and figure given by Wall}, which represent each lateral half of the 
pelvis of a young female Cachalot as composed of two bones, placed end to end, does not 
accord with the general observation upon the more common Dolphins, that each of the 
ischial bones ossifies froma single centre. Unfortunately I have no materials to con- 
* In the Porpoise, their anterior extremities diverge from each other. 
+ Eschricht, Nordisch. Wallthiere, p. 136; W. H. Flower, Proc. Zool. Soc. 1865, p. 704. 
t Op. cit. p. 32, and pl. i. fig. 4. 
