148 CETACEA. 



It is said to inhabit the North Sea, and to have been 

 taken on the coast of Holland. Very little is known of 

 this species. 



Delphinus leucopleurus. 



Delphirms leucopleurus, Nilsson, Skand. Faun. 



Lagenorhynchus leucopleurus, Gtbay, Cat. Brit. Mus. Cetacea, 1850. 



White-sided Bottle-nosed Dolphin. 



Description. — Head gradually sloping into the back, which 

 is very short, depressed, and tapering ; lower jaw rather 

 the longer; body largest at the fins, tapering behind 

 pectorals rather far back and elongate, slightly falcate 

 dorsal high, falcate, rather behind the middle of the back 

 on the back near the tail, is a low, rounded, fin-like ridge 

 lobes of the tail rather narrow, elongate ; teeth 28 on each 

 side in the upper jaw, 25 on each side in the lower jaw, 

 small, sharp, curved. Colour of the upper parts bluish 

 black, beneath white, with a large, oblique, grey, or white 

 longitudinal streak on the hinder part of each side. 



The following are the measurements of a female from the 

 Orkneys, May 1835, as given by Gray : — Length from snout 

 to centre of tail, 6 feet 5| inches ; free portion of pectoral 

 fin, 10 inches ; tail, from tip to tip, 14 inches ; from snout 

 to angle of mouth, 9 inches ; length of cranium, 15 inches ; 

 of spinal column, 55£ inches ; vertebra?, 81 ; cervical, 7 ; 

 dorsal, 15; posterior, 59. Teeth, \*Z\% - The external 

 opening of the nostrils near the top of the head was cres- 

 cent shaped, and placed transversely ; weight, 14 stone. 



This species inhabits the North Sea and the coasts of 

 Greenland, and has been taken off the Orkneys, and in the 

 Gulf of Christiania in Norway. 



