98 CETACEA. 
Lagenorhynchus leucopleurus, Gray, Zool. Erebus and Terror. 
34. t. 3, foetus; t. 12, skull; t. 26. f. 3, tongue. sf 
Inhab. North Sea. Orkney, Knox, 1835. Gulf of Christiania, 
1843. 4 
a. 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 hind 
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 4 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 (Delphis?) and 
Steno? fuscus has the part very much compressed, and fined off 
to a very thin, knife-like edge. at 
ec. 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, beg flattened and con- 
cave instead of swollen and convex. Length, entire, 16; of nose, 
83; of lower jaw, 13 inches. Breadth at orbit, 85; at notch, 4 
at middle of beak, 2% inches. 
‘Mr. Knox gives the following description and measurement of: 
female sent from the Orkneysin May 1835. It weighed 14 stone 
Length along margin from snout to centre of tail, 774 inches 
circumference, anterior, to dorsal fiuke, 383; length of pectoral 
extremity free, 10; breadth from tip to tip of tail, 14; lengt 
from snout to angle of mouth, 9; greatest possible gape, 3 
inches. Length of cranium, 15; of spinal column,553=703 mehes 
Weight of skeleton, 7} lbs. Teeth, $3-$3=120. Vertebre 81 
cervical 7; dorsal 15; posterior 59. V-shaped bones commencin 
between the fortieth and forty-first vertebra; pelvis rudimentar 
consisting of two cylindrical bones; pelvis extremities not di 
veloped. The external opening of the nostrils near the verte 
of the head was crescent-shaped, and placed transversely; # 
dorsal fluke was midway between the snout and tail—Knoz. _ 
The skeleton of this specimen is now in the Museum of t 
