98 CETACEA. 



Lagenorhynchus leucopleurus, Gray, Zool. Erebus and Terror, 

 34. t. 3, foetus; t. 12, skull; t. 26. f. 3, tongue. 



Inliab. North Sea. Orkney, Knox, 1835. Gulf of Christiania, 

 1843. 



. Skeleton. Greenland. From Mr. Brandt's Collection. 

 The specimen figured in the Voyage of the Erebus and Terror. 



b. Foetus. North Sea. From Mr. Brandt's Collection. 

 The foetus has six bristles on each of the upper lips, the hinder 



one being rather farther from the rest than the others are apart, 

 which are equally placed, and of the same size. The tongue 

 (tab. 26. f. 3) is flat on the top and as wide as the space between 

 the sides of the jaws, with a regular sharp denticulated edge on 

 each side, and with a rather larger, conical, separate tubercle in 

 front. The teeth are not developed through the gums. The nose 

 is nearly \ the length of the distance between the end of the nose 

 and the eye. The hinder part of the back has a rather thick 

 convexity, like a long, low, rounded, second dorsal fin just before 

 the tail ; the same part of the foetus of Delphinus (Delphisl) and 

 Steno ? fuscus has the part very much compressed, and fined off 

 to a very thin, knife-like edge. 



c. Skeleton. North Sea. From Mr. Brandt's Collection. 

 The skull is at once known from the skull of the L. albiros- 



tris, at Norwich, by being smaller and the nose rather narrower, 

 and especially by the hinder part of the intermaxillaries, which 

 form the triangle in front of the blower, being flattened and con- 

 cave instead of swollen and convex. Length, entire, 1 6 ; of nose, 

 8i ; of lower jaw, 13 inches. Breadth at orbit, 8J ; at notch, 4 ; 

 at middle of beak, 2f inches. 



Mr. Knox gives the following description and measurement of a 

 female sent from the Orkneys in May 1835. It weighed 14 stone. 

 Length along margin from snout to centre of tail, 77i inches ; 

 circumference, anterior, to dorsal fluke, 38 5 ; length of pectoral 

 extremity free, 10; breadth from tip to tip of tail, 14; length 

 from snout to angle of mouth, 9 ; greatest possible gape, 3J 

 inches. Length of cranium, 15; of spinal column, 55 f = 70 J inches. 

 Weight of skeleton, 1\ Ibs. Teeth, -=120. Vertebrae 81 : 

 cervical 7; dorsal 15; posterior 59. V-shaped bones commencing 

 between the fortieth and forty-first vertebra ; pelvis rudimentary, 

 consisting of two cylindrical bones ; pelvis extremities not de- 

 veloped. The external opening of the nostrils near the vertex 

 of the head was crescent-shaped, and placed transversely; the 

 dorsal fluke was midway between the snout and tail. Knox. 



The skeleton of this specimen is now in the Museum of the 



