?2 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. MESOPLODON GRAYI, Haast, 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. 



Habitat. New South Wales ; New Zealand. 



References. Haast, Trans. N.Z Institute 1876, ix. p. 450, pi. 

 xxvi. fig. 3 (side view of skull) ; Flower, Trans. Zool. Soc. x. pis. 

 Ixxi., fig. 2 (tipper view of skull), Ixxii. fig. 2 (side vieiv of ditto), 

 and Ixxiii. figs. 1 (skeleton) and 2 (sternum). 



Family II. DELPHINID^. 



Teeth usually numerous in both jaws. Symphysis of mandible 

 short or moderate, never exceeding one-third of the length of the 

 ratnus. Lachrymal bone not distinct from the jugal. Anterior 

 ribs attached to the transverse processes of the dorsal vertebra; by 

 the tubercle, and to the bodies of the vertebrse 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, Lacepede (1804). 



Pterygoid bones very small, not meeting in the middle line, 

 approaching each other posteriorly. Cervical region comparatively 

 long, all the vertebrae 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. 



Vertebrce. C. 7, D. 11, L. 6, Cd. 26 = 50, subject to individual 

 modifications. 



Dentition. to 1. 



