CETACEA. /7 



** Teeth of upper and lower jaw conical, deciduous. 

 5. BELUGA. 



Head rounded; forehead convex; teeth conical only on the 

 front half of the jaws, oblique, often truncated, and the upper 

 often deciduous ; dorsal fin none ; pectoral suboval ; tongue ob- 

 long, with a simple, slightly raised edge ; skull with the nose and 

 the hinder wing of the maxilla bent down on the orbits, making 

 the forehead very convex ; lower jaw not so wide as the upper, 

 with the condyle low down below the middle of the hinder edire. 

 Zool. Ereb. fy Terror, t. 29. fig. 3. 



Delphinopterus, Lacep. Get. 243. 



Delphinaptems F. Cuv. D. S. N. lix. 517, 1829. 



Beluga, Rafin. Anal. Nat. 60, 1815 ; Gray, Spic. Zool. 2, 1828 ; 



Lesson, Man. ; Bell, Brit. Quad. 1837. 

 Delphis, Wagler, N. S. Amph. 34, 1830. 

 Delphinus, pars, Linn. ; Illiger, Prod. 143, 1811. 

 Catodon, pars, Artedi, Gen. 78 ; Fleming, B. A. 29. 

 Cetus, pars, Brisson, R.A. i. 227, 1762. 

 Physeter, pars, Linn. S. N. 

 Cachalot, pars, Lacep. Get. 

 Phocaena, pars, F. Cuv. Cetac. 



There is a great similarity in the general form of the skulls of 

 Phoccena, Beluga and Monoceros, but independent of the size 

 and teeth, they diifer in the form of the convexity in front of the 

 blower ; in Beluga the front of the blower is flattish, in Mono- 

 ceros there is a broad, half-oblong convexity, and in Phoc&na a 

 squarish tuberosity. 



The genus Delphinopterus was formed by Lacepede to contain 

 this animal, which he before described as a Catodon, and the 

 D. Senedette, which is probably a Catodon. It has been applied 

 by Peron, Cuvier and others to a very different animal. 



1. BELUGA CATODON. The NORTHERN BELUGA. 



White ; young black ; the nose of the skull nearly J the entire 

 length, 1J the length of its width at the anterior notch; teeth 

 t-. 

 Balaena minor in inferiore maxilla tantum dentata, sine pinna aut 



spina in dorso. Sibbald, Phal. 9 ; Rail Syn. Pise. 15. 

 Cetus bipinnis, Brisson, R. A. 361. 

 Catodon fistula in rostro, Artedi, Gen. 78 ; Syn. 108. 

 Physeter Catodon, Linn. S. N. 107 ; Gmelin, S. N. i. 226 ; Desm. 



Mam. 525, from Balaena minor, Sibbald, Phal. 9. 

 ? Cetus minor, Brisson, Reg. Anim. 361. 



