79 MESOPLODON. 
basirostral groove deep. Premaxillary foramen behind the 
maxillary. 
Dimensions.—Up to about fifteen feet. 
Habitat.—Lord Howe Island ; Seychelles. 
References.—Gray, Suppl. B.M. Catal. Seals and Whales, p. 102, 
fig. 103 (skeleton); Scott, Seals and Whales, p. 118. 
3. MEsopLopoNn GRAYI, //aast, sp. (1876). 
Small-toothed Whale. 
Mandibular tooth small, triangular, vertical, opposite posterior 
edge of symphysis; a series of small conical teeth set in the gum 
of the upper jaw, commencing opposite the lower tooth and extend- 
ing nearly to the gape of the mouth. Lateral basirostral groove 
deep. Back black getting a little lighter near the tail, where it 
assumes a dark slate tint ; below reddish-brown. 
Dimensions.—Up to eighteen feet. 
Hahitat.—New South Wales ; New Zealand. 
References.—Haast, Trans. N.Z Institute 1876, ix. p. 450, pl. 
xxvi. fig. 3 (side view of skull) ; Flower, Trans. Zool. Soc. x. pls. 
Ixxi., fig. 2 (upper view of skull), \xxii. tig. 2 (side view of ditto), 
and Ixxiii. figs. 1 (skeleton) and 2 (sternwm ). 
Family I1.—DELPHINIDAL. 
Teeth usually numerous in both jaws. Symphysis of mandible 
short or moderate, never exceeding one-third of the length of the 
ramus. Lachrymal bone not distinct from the jugal. Anterior 
ribs attached to the transverse processes of the dorsal vertebrae by 
the tubercle, and to the bodies of the vertebr by the head ; the 
latter attachment lost in the posterior ribs. Sternal ribs firmly 
ossified. External respiratory aperture transverse and crescentic, 
the horns of the crescent pointing forwards. 
Genus I.— DELPHINAPTERUS, Lacépede (1804). 
Pterygoid bones very small, not meeting in the middle line, 
approaching each other posteriorly. Cervical region comparatively 
long, all the vertebrze distinct or with irregular unions towards 
the middle of the series. Fore limb small, short, and broad ; 
second and third digits nearly equal, the fourth slightly shorter. 
No dorsal fin. 
Vertebra.—C. 7, D. 11, L. 6, Cd. 26 =50, subject to individual 
modifications. 
Dentition.—% to 49. 
