230 PROFESSOR FLOWER ON THE RECENT ZIPHIOID WHALES. 
resembles generally the form of the same part in Ziphius and Mesoplodon, but is pro- 
portionally longer than in Hyperoodon, and still more than in Physeter. The inferior 
surface is slightly convex from before backwards, and also from side to side. 
It consists of five distinct segments, not connected together by bone. The anterior 
segment is the largest, and has a shallow fossa in the middle line in front; the posterior 
segment ends in a pair of narrow xiphoid processes, of which the right is slightly larger 
than the left. 
As in the other Ziphioid Cetaceans, development is less complete along the middle 
line of the sternum than at the sides; not only are there median notches at each 
extremity, but there are three large median fenestra, one between the first and second 
segments, one between the second and third, and one between the third and fourth seg- 
ments. The edges of these fenestra are bevelled and smooth; so that it does not appear 
that ossification would have advanced further in this direction if the animal had lived 
to be older. 
Each side of the sternum shows six rough articular facets for sternal ribs :—the first 
near the anterior end of the first segment, at its broadest part; the second at the 
junction of the first and second segments; the third at the junction of the second and 
third segments; the fourth at the junction of the third and fourth segments; the fifth 
near the hinder end of the fourth segment; the sixth on the side of the fifth segment, 
near its anterior end. 
The entire length of the sternum in a straight line is 45 inches. The greatest breadth 
of the first segment is 12°8 inches, of the second segment 10°9 inches, of the third 
10 inches, of the fourth 9 inches, of the fifth 8°8 inches. 
Pectoral Limb.—The pectoral limb, as in all other members of the group to which 
Berardius belongs, is small in proportion to the size of the animal. 
The scapula bears a considerable resemblance to that of Hyperoodon ; it is less narrow 
and elongated than in Physeter, and more regularly triangular, and less fan-shaped 
than in the ordinary Dolphins. The external surface is smooth and slightly concave, 
with one vertical ridge near the hinder border. The acromion is large and flat, curving 
regularly inwards, and somewhat upwards towards the extremity. ‘The coracoid is 
rather longer, and more slender and rounded than the acromion. The glenoid fossa is 
irregularly oval, the outer edge more convex than the inner, and the anterior extremity 
more pointed than the posterior. 
The humerus and bones of the forearm are elongated, slender, and simple in 
character; the latter more resemble the corresponding bones of a Balwnoptera than 
of one of the Delphinide. 
The humerus has a rounded head and single tuberosity, formed by a large and still 
free epiphysis. The lower epiphysis includes little more than the articular surface, 
and is united to the shaft, though the line of separation is distinct in many points. 
The radial border of the bone presents, near the middle of its length, a low rounded 
