190S.J Allen, The \<>rth Atlantic Right Wlwlr. 323 



mm. 



Occipito-f rental suture to post border of occip. condyle 740 



Fronto-nasal suture to 880 



Anterior border of nasals to post, border of occip. condyle 1160 



Length of nasals, along outer border 350 



" inner " 250 



Breadth of nasals anteriorly 330 



" posteriorly '. . . . 330 



Length of maxillary, axial 2780 



following curve of sup. external border 3150 



Length of intermaxillary, axial 2810 



along dorsal convexity 32.60 



Breadth of skull at orbital processes of frontal 2500 



" " " at zygomatic processes 2325 



" " " at mastoid processes 1590 



Greatest breadth of occipital bone 1090 



Transverse breadth of occipital condyles 240 



Antero-posterior breadth " " 285 



Transverse diameter of neural canal 145 



Antero-posterior diameter of neural canal 136 



Length of mandible, axial 3270 



along external curvature 4000 



Greatest depth 430 



Transverse diameter of condyle 360 



Vertical " " 370 



The principal dimensions of this skull, in comparison with those of 

 seven other adult skulls of this species three from the coast of the United 

 States and four from Iceland embracing all known that are comparable 

 with it as to age, are as follows : 



Comparative Measurements of Eight adult Skulls of Eubalcena glacialis (Bonn.) . 



America. Iceland. 



Total length (straight) 4140 1 3861 2 3810 3 3650 4 3920 5 3910 8 3830 7 3380 8 mm. 



Orbital breadth 2591 2553 9 2362 9 2500 2550 2460 2500 2150 " 



Lower jaw (straight) 3912 3478 9 3334 9 3270 3820 3900 3820 3190 " 



" (along curv.) 4318 3861 9 4077 9 4000 4033 4030 3480 " 



1 Amagansett, Long Island, N. Y., Feb. 22, 1907; in American Museum of Natural History, 

 New York City. Female. Measurements from R. C. Andrews, Bull. Arner. Mus. Nat. Hist., 

 XXIV, 1908, p. 178. 



2 Cape Lookout, N. C., March 20, 1894; in State Museum, Raleigh, N. C. Male. Measure- 

 ments from F. W. True, Whalebone Whales of the Western North Atlantic, 1904, p. 253. 



3 Long Island, New York; in Field Museum, Chicago, 111. Measurements from True, I. c. 



4 Provincetown, Mass., April, 1864; in Museum Comparative Zoology, Cambridge, Mass. 

 Measurements original. 



5 Iceland, 1891 ; in University Museum, Christiania. Male. Measurements from Guld- 

 berg, Zool. Jahrb., Abth. f. Syst., VII, 1894, 14. 



"Iceland, 1891; in University Museum, Christiania. Male. Measurements from Guld- 

 berg, I. c., p. 10. 



7 Iceland, 1890; in University Museum, Christiania. Measurements from Guldberg, I. c., 

 p. 10. 



8 Iceland, 1891; in Bergen Museum. Measurements from Guldberg, I. c., p. 13. 



9 Calculated on the basis of Mr. True's table of precentages. 



