ANATOMY OF MEGAPTERA LONGIMANA. 

 Table I. — continued. 



21 



Megaptera 

 40 feet. 



B. musculus 

 50 feet. 



Radius, breadtli at proximal end below the epiphysis, 

 ,, breadth at narrowest part, 

 ,, thickness at ditto, .... 



,, breadth at wrist, above the epiphysis, . 

 ,, thickness at ditto, .... 



Ulna, length, ....... 



,, ditto without epiphyses, .... 



,, breadth at proximal end, includingbony olecranon 



,, breadth at narrowest part, 



,, thickness at ditto, ..... 



,, breadth at wrist, above the epiphysis, 



,, thickness at ditto, ..... 



Width of interosseous space, at middle, 

 Breadth of radius and ulna together at wrist, 

 Carpus, length at middle, ..... 



„ breadth, with pisiform, 

 ,, ditto without pisiform, . 



ft. in. 



7i 



ft. in. 

 U 



41 



Hi 

 6 



6 



3i 

 6| 

 4| 

 3 



n 



3 



Of 

 7 

 5 

 lU 

 64 



2i 



6| 

 3i 



11 

 6A 



4| 



n 



2 



llj 



u 



llf 

 n. 



3. The Scapula. — The scapula of Megaptera differs greatly 

 from that of B. musculus in form, in being higher in proportion 

 to its antero-posterior length, and in its upper border being 

 more arched upwards, and in its thickness, but the chief differ- 

 ence is the absence in Megaptera of an acromion process, and in 

 the rudimentary condition of the coracoid. A low thick spine 

 is seen in much the same position as in B. musculus, marking 

 off a very shallow prescapular fossa, about 2 inches in breadth ; 

 but this low spine disappears at 7 inches from the glenoid cavity, 

 and there is not even a ridge where the acromion would have 

 been placed. The coracoid projects only for 1 inch, but extends 

 into the area of the glenoid cavity, forming the anterior and 

 inner part of the cavity for a space of 3| inches in width and 

 2 inches long- ways. The line of synostosis is still visible on the 

 left scapula (fig. 8), but is nearly obliterated on the right scapula. 

 The projection of the coracoid would be greater in the mature 

 state, as on its low blunt end there is a triangular area 1| inch 

 by If across, which has been covered by cartilage. 



The proportions of the scapula, actual and in comparison 

 with those of B. musculus, will be seen from the measurements 

 given in Table II. Its greater height in Megaptera, compared 

 with its antero-posterior length, is well brought out by measure- 



