CETACEA. 97 
ee Head beaked. Nose of skull longer than the brain-cavity. 
11. LAGENORHYNCHUS, Gray. 
_ Head rather convex, gradually sloping into the beak in front. 
Beak short, tapering in front. Lower jaw rather longest. Body 
elongate, tapering behind, largest at the pectoral fins. Pectoral 
fins rather far back, rather elongate and slightly faleate. Dorsal 
fin high, faleate, rather behind the middle of the back. The back 
“with a low, rounded, fin-like ridge near the tail. Tail-lobes rather 
narrow, elongate. Skull rather depressed, the hinder ends of the 
‘maxillary bones expanded, horizontal, and rather thickened on 
‘the edge. The nose is short, broad, flat above and rather nar- 
‘rowed in front, and scarcely longer than the length of the brain- 
‘cavity. The triangle in front of the blowers is elongate, and 
reaches beyond the middle of the nose of the skull, and the in- 
‘termaxillaries are separated by a deep groove filled with cartilage. 
I agenorhynchus, Gray, Zool. Erebus & Terror, 34, 1846. 
Grampus, pars, Gray, Spic. Zool. 2, 1828. 
Delphinus, sp., Brightwell, Ann. & Mag. N. H. 1846. 
_ This genus is easily known from Delphinus by the lowness of 
the forehead, the short and depressed form of the beak, the poste- 
rior position of the dorsal fin, the body being attenuated be- 
hind; and by the breadth, and flat, expanded form of the nose 
‘of the skull. 
_ The os hyoides of L. leucopleurus is large and broad. 
4 Beak very short ; nose of skull only as long as head ; teeth 
. nearly to the notch. 
. LAGENORHYNCHUS LEUCOPLEURUS. WHITE-SIDED 
BoTrLE-NOSE. 
r ‘Skull: brain-cavity large, high at the top behind the blow- 
hole; nose nearly as long as the brain-cavity, gradually and regu- 
rly tapering on each side; triangle in front of the blower flat- 
tened and concave behind, with a slightly-raised, lozenge-shaped 
space in the front half. 
Above bluish black, beneath white, with a large, oblique, grey 
r white longitudinal streak on hinder part of each side. Teeth 
&. small, acute, curved. : 
elphinus Tursio, Knox, Cat. Prepar. Whale, 29, 1838. 
Jelphinus leucopleurus, Rasch, Mag. Zool. 1843, 369; Nilsson, 
» Skand. Fauna, i. 598. 
