48 



SPECIMENS OF CETACEA. 



Vertebra ; the transverse diameter of the inlet is 

 4 feet 9 inches, the sterno-vertebral is 3 feet 4 inches. 



21. Sternum of B. sibbaldi from the fcetus of the Longniddry 

 specimen. At this stage the sternum consists of two 

 cartilaginous segments, an anterior tliree-lobed, 5"8 

 inches in transverse, 3'4 inches in anteroposterior 

 diameter, and an almond-shaped segment 1"1 inch in 

 antero-posterior, and 0"6 inch in transverse diameter. 

 Each segment is enclosed by its perichondria! envelope. 

 Described by Turner in Journ. Anat. and Phys., 

 May 1870, vol. iv. See figure below. 



22. Pectoral Limb, articulated skeleton of right, with scapula. 

 Length of scapula between angles 5 feet 7 inches ; 

 glenoido- vertebral breadth 3 feet 3 inches ; length 

 of acromion 1 foot 5 inches, breadth 10 inches; length 

 of coracoid 9 inches. From head of humerus to tip of 

 third or longest digit 13 feet 1 inch, length of humerus 

 26 inches, of radius 3 feet 10| inches, of ulna with 

 olecranon 4 feet 3 inches. See Plate IV. 



In the fcetus much of the scapula was cartilaginous : 

 a plate 6h by 4^ inches surrounded the posterior 

 angle, and from it a narrow strip was prolonged 

 on the vertebral border to the anterior angle. The 

 acromion was tipped with a plate 2h inches long. 



