CETACEA. 105 



2. DELPHINAPTERUS BOREALIS. 



Elongate, snout slightly protruding ; black, with a white lan- 

 ceolate spot on the breast, which is extended in a narrow line to 

 the tail. 



Delphinaptems borealis, T. Peak, U. S. Exp. Exped. 35 (t 8 



f. 2. ined.). 

 Hab. North Pacific Ocean, lat. 46 6', long. 134 5' W.Peale. 



13. DELPHINUS. 



Forehead rounded. Nose produced, bald. Dorsal fin falcate, 

 in the middle of the back. Skull with the hinder wings of maxilla 

 horizontal, sometimes thickened on the edge over the orbit ; nose 

 elongate, tapering, depressed, broader than high, convex, roundish 

 above, and slightly concave in front of the blowers, nearly parallel 

 on the sides and rounded in front. Teeth small, conical, extend- 

 ing the greater part of the length of the jaw. 



Delphinus. Gray, Spic. Zool.}, 1828; Zool. Erebus & Terror, 



36, 1847; Wagler, N. S. Amph. 35. 

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

 Delphinorhynchus, pars, Lesson. 

 Grampus, sp. Gray, Spic. Zool. 2, 1828. 

 Cephalorhynchus, sp., F. Cuvier, Cetac. 



Most maritime persons call these animals Bottle-noses, Bottle- 

 heads, Flounder-heads, Grampuses, Porpoises, Porpesses, or 

 Porpusses, sometimes adding Whale to the name. They gene- 

 rally confine the name of Dolphin (most used by landsmen) to 

 the Scomberoid fish ( Corypli&na), which changes colour in dying. 



In the British Museum there is a foetus, apparently belonging 

 to the Delphinus Delphis, figured in the Zoology of the Erebus 

 and Terror, t. 26, with its tongue in detail ; it formed part of the 

 collection of Sir Hans Sloane. It differs from the foetus of La- 

 genorhynchus acutus in the nose being more produced (nearly ^ 

 the length of the distance from the end of the nose to the eye) ; 

 it has seven black rigid bristles on each side ; the two front, rather 

 the largest, are on the side of the upper part of the nose, the five 

 hinder forming a descending line nearly parallel to the groove 

 which separates the beak. The tongue is convex on the sides, 

 with a rather narrow flat space on the hinder part, separated from 

 the under sides by a sharp entire edge ; the front is rather dilated, 

 sharp-edged and obscurely crenated. 



E5 



