158 MR. W. H. FLOWER ON THE SKELETON 
and broad (from before backwards). ‘The first pair are only united for a small space at 
their backward-directed pointed apex. ‘The others are all firmly united, except the 
fourteenth pair, which are very minute, flattened, and subcircular. The fifth are the 
longest. All these bones, as shown in the figure, are exactly in their natural position, 
as they have never been separated from the bodies of the vertebra. 
The form of the caudal appendage is shown in outline at fig. 2, Pl. XVII., drawn 
from the dried specimen sent by Mr. Swinhoe, after its natural shape and dimensions 
had been restored by soaking in water. The length between the extremities of the 
* flukes ” is 204 inches. * 
There are twelve pairs of ribs. The five foremost have necks and heads which reach 
the bodies of the vertebree. The sixth has a rudimentary neck, the others none, and 
are only attached to the ends of the transverse processes. ‘The last rib is nearly as well 
developed as its predecessor. Some of the sternal ribs are wanting; but those that are 
present indicate that there were at least seven pairs of these bones. 
As before mentioned, the sternum is missing. 
The scapula generally resembles that of other Dolphins, but it is rather high in 
proportion to its breadth, and has its posterior angle obliquely truncated. The 
acromion is broad, and the coracoid rather small. The characters of the scapule of 
the other individual sent by Mr. Swinhoe are precisely similar. 
The humerus, radius, and ulna appear to differ little in the true Dolphins, and in the 
present specimen they offer nothing worthy of note, except that the olecranon is but 
slightly developed. ‘These bones are ankylosed together at the elbow-joint. 
The manus is broader at the base than in most Dolphins (e.g. D. delphis and D. 
tursio), and much resembles in form that of D. guianensis, as figured by Professor Van 
Beneden’. ‘This breadth is caused by the considerable development and position of the 
two outer digits. It is faleate and obtusely pointed at the extremity. Considering the 
age of the animal, the carpal bones are less developed than in other Dolphins available 
for comparison, as, instead of being united into a sort of closely fitting mosaic, they 
have rounded borders and are all separated by cartilaginous intervals. They are, as 
usual, five in number, and probably represent the scaphoid, lunar, cuneiform, trapezium, 
and unciform. The scaphoid is the largest and of an oblong form, the cuneiform a 
very small rounded nodule. 
The first digit consists of a single, slender, tapering metacarpal, without any ossified 
phalanx. The other metacarpals are broad and flat. The second digit has six pha- 
langes; the third, five; the fourth, two; and the fifth, one broad phalanx in addition 
to a well-developed metacarpal. ‘The size of the last two digits (so often almost aborted 
in the Delphinidz) is the more remarkable, as the ulnar side of the carpus shows such 
a comparative arrest of ossification. 
‘ Mem. de l’Acad. Roy. de Belgique, Coll. in-8vo, tom. xvi. 1863, p. 33. 
