ORDER CETACEA. 457 



The common orifice of the two spiracles is above the eye, 

 nearer however to the muzzle than this organ. 



The pectoral fins small and sloped, are situated very 

 low ; the dorsal which bears a certain extent is also sloped. 

 The winter is said to be the period of parturition. 



The Delphinus Feres, Lacep., is about fifteen feet long-, 

 the skin which is blackish is very fine ; the upper part of 

 the head is elevated and convex. 



In each jaw, and both are of equal length, are twenty 

 unequal teeth, ten of which are thicker and larger than the 

 rest ; one half of the tooth is enclosed in the gum, and the 

 other half, is of a rounded form at the top, ovoid and 

 divided into two holes by a longitudinal curve. 



When this animal has received a few deep wounds, it 

 sends forth the most piercing cries, which, when simul- 

 taneously repeated by a number of individuals of the same 

 species, produces a bellowing excessively deep and terrific. 

 The Dolphin of Per on is blackish-blue on the back ; end 

 of the muzzle and extremity of the fins and tail of a brilli- 

 ant white. 



We have inserted a figure of a new species of Dolphin in 

 the museum at Paris, named by the Baron in the " Ossemens 

 Fossiles" Delphinus Frontatus, of which nothing is known 

 beyond its specific characters mentioned in the Table. 



The Dolphin of Commerson was discovered in the neigh- 

 bourhood of Terra del Fuego, and in the Straits of Ma- 

 gellan. The extremities are black, and all the other parts 

 of a polished and silvery white. Commerson has seen them 

 in numerous bands in the rivers of Cape Horn, swimming 

 round his vessel, and remarkable for the facility with 

 which they outswam it. This Dolphin is less than the 

 Porpoise. 

 The family of the Delphinateri contains two species. 

 The Beluga (Delphinus Leucas) is found in the Arctic 

 Icy Sea, in the Northern Atlantic, and especially in Davis's 

 Vol, IV. * 2 II 



