CATALOGUE OF THE CETACEA. 30£ 



Breadth of beak at three-quarters its length from base g 00 



Breadth of maxillary at three-quarters its length from base 1 50 



Breadth of premaxillary at three-quarters its length from base 1 25 



Length of lower jaw in a straight line 47 qo 



Height at coronoid process 6 00 



Length from posterior end of condyle to coronoid process 7 .50 



Height of ramus at middle 4 00 



Amount of curve 6 50 



Length of otic bullae 3 50 



, The thinner edges being covered with dry membranes, have been somewhat gnawed by vermin. 



Family Bal.'Enid^, Gill, p. 98. 



« 



Genus Balsena, Gray. 

 Bakeiia, Gray, 186C, p. 78. 

 Muhalcena, Gray, 18GG, p. 78. 



Balsena Sieboldii. PL xii, fig. 1. Baleen, p. 55. 



Eubalcena Sieboldii, var. Japonica, Gray, 18GG, p. 97; 1871, p, 43. 



Balcena cullamach? Cham., Cope, Proc. Phil. Acad. 1869, p. 15; Scammon, 1. c, p. 38, 



fig. 4. 

 Pacific Rigid Whale, of Scammon. 



Arctic, Bering, and Ochotsk Seas. Lower California. Japan? 



The Euhalcena Sieboldii was founded on a drawing of a Japanese clay model, named B. aiislralis 

 in the Fauna Japonica; and the sujjposed variety Japonica, from baleen from the North-west Coast. 

 The description properly rests upon tliis baleen, as the former basis is utterly insufficient for the 

 introduction of a specific name into a scientific system. The figure of the baleen agrees with the 

 baleen of the Eight Whale of Scammon, and I have little doubt that they belong to the same 

 species. The name Japonica had i:(reviously been used by Lacejoede, and is, to some extent, a 

 misnomer, so I have preferred to retain the original name of Gray. This species is doubtfully 

 referred to the B. cullamach of Chamisso, by Cope ; but it does not, as he observes, possess the 

 recurved rictus attributed to that species, which itself rests upon no scientific foundation, and 

 hence I have preferred to use a name for which there is some slight basis in the shajDC of sjieci- 

 mens by which the species ma}' be hereafter satisfactorily identified. It reaches the length of sixty 

 feet, is dark colored above and lighter below. Baleen in B. M. and Mus. S. I. 



C'yamus lentator, Ball, and C. gracilis, Ball, are parasitic upon this species. 



Balaena mysticetus.* PI. xi, fig. 1; baleen, p. 55. 



B. mysticetus, Linn., S. N. i, 105; Gray, 1866, p. 81; 1868, p. 1, pi. 1, f. 4 (baleen); 



1871, p. 38; Cope, Proc. Phil. Acad^. 1869, p. 15; Scammon, 1. c, p. 33. 

 Bowhead, of Scammon. 



Bering, Ochotsk, and Arctic Seas. 



The Cyamus mysticeii, Ball, pi. x, fig. 2, is parasitic on this species. 



? Variety Roysii. Page 56, outline figure. 



Boys' Banchback, of Scammon, 1. c, p. 35. 



Ochotsk Sea. 



No special differences appear to separate the Bowheads of these regions from those of the 



*Seo illustration of Bkeleton at the conclusion of this Catalogue. — C. M. S. 

 Marine Mammals.— 39. 



