} Transactions, "-"Z oology, 



Inohes, 

 Breadth of coraeoid at base 3 



Length of acromion 8 



Greatest width of acromion 3f 



Antero-posterior diameter of glenoid cavity . . 9J 



Transverse „ ,, ,, 6| 



Circumference of glenoid cavity 25 



The Humerus. — 



Greatest length 17 



„ breadth at head 9J 



„ „ ,, narrowest part of shaft 6| 



,, „ „ condyles 9£ 



Circumference of neck. 27 



„ ,, middle of shaft 18| 



. The Radius. — 



Greatest length 29 



Breadth of head £ 



Circumference of head 17 



Diameter at middle of shaft 4J 



Circumference at middle of shaft . . . . . . . . • . . . 114 



Diameter of distal end of shaft 6 



Circumference „ „ ,, " 16 



The Ulna.— 



Greatest length 29§ 



Length of shaft 26J 



Circumference of shaft at neck 11 



Diameter „ „ middle 3 



Circumference „ „ ,, .. .. .. .. .. ..8 



Width of distal end . . . . . . . . . . . . • . . . 5 



Circumference of distal end . . . . . . . . . . . . . . 12 



Length of olecranon, taken parallel to shaft 7 



It would be quite superfluous to enter into any detailed description of 

 the skeleton, the correspondence with published accounts of Balanoptera 

 musculus of the Northern Hemisphere being so close as, in most respects, 

 to amount to identity. Indeed, with one or two trifling alterations, many 

 of Van Beneden and Gervais's figures of that species* might have been taken 

 from the present specimen. There are, however, one or two points in 

 which the skeleton appears to differ from those hitherto described. 



1. The Nasals (fig. 1). — In these the anterior processes are unusually 

 large, and the bones are altogether larger in proportion to the skull than is 

 usual in B. musculus. For instance, in the Alexandra Park skeleton,! with 

 a skull 38 inches longer than that of the present specimen, the nasals are 

 four inches shorter, the same width at their posterior ends, and two inches 



* Osteographie des Cetaces, t Flower, P.Z.S., 1864, p. 411, 



