XII, "1 



PROCEEDINGS OF THE NATIONAL MUSEUM 



93 



From the harmony of the other parts it is not assuming too much to 

 suppose that the skull of perspieillatus would resemble that of urile. 



With the exception of the sternum the greater size of the bones dis- 

 tinguishes those of perspieillatus from those of urile, while well-marked 

 differences of shape or proportion exist between tlie corresponding 

 bones of perspieillatus and carbo. 



P. perspieillatus appears to have been a much heavier bird than carbo, 

 and a bird of weaker flight; with more robust and muscular legs, and 

 a more slender and more feeble head and neck. 



In comparing the following tables of measurements it must be said 

 that they do not adequately convey the impression produced by a com- 

 parison of the bones themselves. Thus, in tbe measurements of the 

 lower mandible the greatest vertical width is comparatively as great as 

 in carbo, but from this point the ramus tapers rapidly either way so 

 that as a whole the mandible is much weaker than that of carbo. 



So too with the humerus, where the greatest proximal width is only 

 2mm greater than in carbo, although the bone in its entirety is much 

 more stoutly built. 



Measurements (in millimeters) of corresponding bones of Phalacrocorax perspieillatus, 

 carbo, urile, and dilophus. 



[All measurements are in a direct line and not along curves.] 



Rostrum : 



Tipof mandible to extremity of maxillo-jugal bar 



Maxillo-jugal bar 



Tip of mandible to posterior end of palatine 



Width across nasals, at frontonasal hinge 



Lower mandible : 



Length of ramus 



Greatest height of ramus 



Sternum : 



Anterior end of carina to nieso-xiphoid 



Manubrium to meso-xiphoid 



Depth of carina 



Width across articulations of first rib 



Width across articulations of fourth rib 



(Joracoid : 



Length 



Breadth of sternal articulation 



G reatest distal breadth 



Humerus: 



Length 



Greatest proximal breadth 



Greatest diameter midway between extremities. 



Greatest distal breadth 



Ulna: 



Length 



Greatest proximal breadth 



Greatest diameter of shaft midway between ex- 

 tremities 



Pelvis : 



Greatest length of ilium 



From anterior border of ilium to external angle 

 of anti-trochanter .'. 



Greatest width of ilia in advance of acetabuia. .. 



Least width of ilia in advance of acetabuia.... 



Width between outer extren.ities of anti-trochan- 

 ters 



Length of ilio-isehiatic space 



