MONODON. 



DELPHINAPTERUS. 



26. monoceras. (J/('//('i/('«), Linn. Syst. Nat., 1766, i, p. 105. 

 7'ii/garis, Lacep. Hist. Nat. Cet. , 1804, p. 142. 

 andenoiiii, Lacep. Hist. Nat. C^t., 1804, p. 163, pi. g, fig 

 microcc/'ha/in, Flem. Mem. Wern. Nat. 



Hist. Soc, 1811, t. 



Type locality. Greenland Sea. 



Geogr. Diitr. Arctic seas. 



Getil. Char. Same as those of the genus. 



Color. Above dark gray, mottled with 

 gray on sides and back; beneath white. 



Mcasurcmt-nts. Total length, 3915; tip 

 of snout to pectoral, 762; length of pecto- 

 ral, 381; greatest breadth of same, 17. 

 Skull; total length, 54; length of rostrum, 

 23.7; breadth of same at base, 22; at mid- 

 dle, 13.7: interorbital breadth, 34.4; length 

 of temporal fossa;, 15.2. Developed tooth 

 often reaches a length of seven or eight 

 feet. 



15. Delphinapterus. 

 ?^ to ^^^^ = 32 to 40. 



S— 8 10—10 -■ ^ 



Oelphinapterus. Lacep. Hist. Nat. Cet., 



1804, p. xli. Type D. heluga, 



Lacep. 

 No dorsal fin, middle of back arched; 

 head globose: pectorals, short, broad, 

 pointed; teeth standing apart, small, coni- 

 cal and pointed, crowns inclined forwards. 

 Skull elongated, depressed, narrow; ros- 

 trum broad at base, narrowing toward tip 

 where it is recurved. Vertebras, 50. 



27. leucas. (Z?6-/////«//i), Pall. Raise, Kunl., 



1776, III, p. 85, pi. 74. 



catodon, (Linn.) Syst. Nat., 1766, p. 10. 



beluga, Lacep. Hist. C(5t., 1804, p. 50. 



albicans, (Klein). Briss. R. Anim., 17, 



P- 259- 

 canadensis, Desm 



1822, p. 516. 



Fig. 6. MONODON monoceraS. 

 2nd Pt., From KloworandLeydekker- Mam- 



Mamm 



mals living and e.\tinct. 



angustata. Cope, Proc. Acad. Nat. Scien. Phila., 1859, p. 25 

 rhinodon, Cope, Proc. Acad. Nat. Scien. Phil., 1865, p. 278 



