100 



THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



MEGAPTERA BELLICOSA COPE. (TYPE.) 



Measurement. 



Cope's 

 Measure- 

 ments. 



My 



Measure- 

 ments. 

 1900. 



in. in. 



Total length of skull 108. in. 



Length of maxilla 65 . 64. 25 ' 



transverse, of orbital plate of frontal 29. 29." 



longitudinal 26. 26." 



Distal width over orbit " " " " 11.5 11.5' 



Length of nasals 9. 9.5" 



Width 1.5 1.25" 



" cranium behind orbits (greatest) 64. 67.5 



" muzzle J- the distance to frontal plates 27.5 26.25' 



"maxilla}" " 10.5 10." 



Length of mandible on curve 1 18. 



First rib, on curve 37. 37. 



" " distal width 7. 7." 



Humerus, length 21. 20.5' 



Radius, 30. 29.5" 



Scapula, height 25.5 26.5" 



width 39.5 . 38." 



glenoid length 11.5 n. 



" width 9. 9. 



The following are actual measurements of the type-skeleton, made by me in 

 accordance with the system I have applied to all the various species : 



MEGAPTERA BELLICOSA COPE. (TYPE.) 



SKULL REGULAR MEASUREMENTS. 



Inches. 



Length (straight) "4-5 



Greatest breadth (squamosal) ., 67.5 



Breadth of orbital process of frontal at distal end least point to point. 8.25 



Length of rostrum (straight) 75. 



Breadth of rostrum at middle (curved) 26. 25'" 



Length of nasals 9." 



Breadth of nasals at distal end 8." 



SKELETON REGULAR MEASUREMENTS. 



Inches, 



Length of skull (straight) 1 1 1 . 



Greatest breadth of axis 21.5 



Depth of centrum " " \ Pf- 



I ant. 6. 



Greatest breadth of i st dorsal 19.5 



Depth of centrum " " 7.5 



Greatest breadth of ist lumbar 29.5 



Depth of centrum " " 8. 



Greatest breadth of ist caudal 26." 



Depth of centrum " anterior i o. 



Greatest length of scapula 38.'" 



depth " " 26. 5 ' 2 



Length of radius, along middle, with proximal epiphysis 



without epiphyses . 2 9 J" 



ulna with proximal epiphysis 25." 



"_ without epiphyses .' 24." 



The left maxilla. It is broken. About 3 in. should be added. * Along post-margin. 



Greatest, proximally. ' Greatest; the least is 8| in. 6 Left nasal ; length of inner margin. 



Left nasal at proximal end. ' As mounted. " Right. The left is gj- in. 



The other rib, ist pair, j^ in. 10 Straight, when standing on its head, without distal epiphysis. 



'Right. "Left " As mounted. " Twice one. 



5 Median. The long diameter of the surface articulating with atlas is (right) 9 in.; (left) 8f in. 



8 Twice one half ; the left diapophysis is defective. 



