244 PROFS. J. H. SCOTT AND T. J. PAEKEE ON A 



The vertebral column consists of seven cervical, ten thoracic, nine lumbar, and twenty 

 caudal vertebrae. In all but the anterior cervicals the epiphyses are separate, and, in 

 the fresh state, the neural spines were tipped with cartilage. 



The first four cervical vertebi-se are united ; the ankylosis of the fourth is, however, 

 imperfect, its arch being quite separate from that of the third on the right side, and 

 the epiphyses between the adjacent centra being clearly distinguishable. 



The total number of chevron bones in the skeleton in its present condition is nine ; 

 by the facets on the vertebral centra there were almost certainly two others ; the last 

 was attached to the interval between the 11th and 12th caudal vertebrae. 



The sternum has the usual character, consisting of five sternebrae united by synchon- 

 droses, diminishing progressively in size from the first to the last, and each having a 

 deep notch both on its anterior and posterior border. The diverging posterior crura 

 of the last sternebra are tipped with cartilage, and do not, as stated by von Haast, give 

 attachment to the sixth sternal ribs. The first sternal rib articulates with a cartilage- 

 covered facet on the lateral border of the first sternebra ; the second to the fifth sternal 

 ribs articulate at the intervals between the first and second, second and third, third 

 and fourth, and fourth and fifth sternebrae respectively ; the sixth is united to the poste- 

 rior border of the fifth near its sternal articulation. The remaining ribs do not reach 

 the sternum. 



There is nothing remarkable about the shoulder-girdle and fore limb ; as, however, 

 all the figures of these bones we have been able to find show them in the dried condi- 

 tion, after removal of the cartilage, we give (PI. XLIX.) figures of the scapula (fig. 4), 

 of the proximal end of the ulna showing the great olecranon process (fig. 6), and of the 

 right manus (fig. 5). Both proximal and distal epiphyses of the humerus, radius, and 

 ulna are quite separate. 



The carpus (fig. 5) consists of six elements, five of which are ossified while the sixth 

 or pisiform remains cartilaginous. The first metacarpal articulates directly with the 

 scaphoid, the second and third metacarpals with the trapezoid (or united trapezoid and 

 magnum), and the fourth and fifth with the unciform. 



The number of phalanges in each digit is as follows : — • 



I. II. HI. IV. V. 



15 5 5 2 



In the second and third digits the ossification of the distal phalanx is a mere nodule 

 of bone ; in the fourth the penultimate phalanx has a similar nodular ossification, while 

 the distal phalanx is entirely unossificd. Burmeister ' gives the number of ossified 

 phalanges in his specimen as 1, 2, 3, 2, and 2, and the total number, i. e. including 

 unossified cartilages, as 2, 7, 6, 5, and 3. In Z. cavirosfris van Beneden and Gervais 

 give the number as 1, 3 (I), 5, 4, and 1, and state that the carpus contains two bones 

 ' Quoted by van Beneden and Gervaie, ' Ost. des Cetaces,' p. 384. 



