270 CETACEA 
Grampus..—Teeth none in the upper jaw; in the mandible few 
(3 to 7 on each side), and confined to the region of the symphysis. 
Vertebre: C7, D12, L19, C30; total 68. General external 
characters much as in Globicephalus, but the fore part of the head 
less rounded, and the pectoral fin less elongated. 
But one species, G. griseus, is certainly known, about 13 feet 
long, and remarkable for its great variability of colour. It has 
been found, though rarely, in the North Atlantic and Mediterranean. 
A skull from the Cape of Good Hope, which differs slightly from 
that of the above, has been described under the name of G. richard- 
soni. 
Feresia.2—This genus, known at present only by two skulls, 
may be provisionally placed here. These appear to indicate a form 
connecting Globicephalus, Grampus, and Lagenorhynchus. From the 
latter they differ chiefly in the smaller number (about 12) and much 
larger size (6-7 mm. in diameter at base of crown) of the teeth. 
Lagenorhynchus.2—Rostrum scarcely exceeding the length of the 
cranium, broad at the base and gradually tapering towards the 
apex, depressed. Pterygoids normal, meeting in the middle line. 
Teeth small (not exceeding 4 mm. in diameter), 23 to 33. Vertebre 
very numerous, 80 to 90. Spines and transverse processes of the 
lumbar vertebrae very long and slender; centra short. Externally, 
head with a short but not very distinct beak. Two species, 
’ L. albirostris and L. acutus, are occasionally captured on the British 
coasts. Other species occur elsewhere. 
Group B.—Head with distinctly elongated rostrum, or beak, 
generally marked off from the prenarial adipose elevation by a V- 
shaped groove. Rostrum of skull considerably longer than the 
cranial portion. Atlas and axis firmly united ; all the other cervical 
vertebree free. 
Tf we add to it the above-mentioned genus, Lagenorhynchus, this 
group will include all the true Dolphins, Bottle-noses, or, as they 
are more commonly called by seafaring people, “Porpoises,” which 
are found in considerable abundance in all seas, some species being 
habitually inhabitants of large rivers, as the Amazon. They are all 
among the smaller members of the order, none exceeding 10 feet in 
length. Their food is chiefly fish, for the capture of which their 
long narrow beaks, armed with numerous sharp-pointed teeth, are 
well adapted, but some appear also to devour crustaceans and 
molluscs. They are mostly gregarious, and the agility and grace 
of their movements in the water are constant themes of admiration 
to the spectators of the scene when a “school of Porpoises” is 
observed playing round the bows of a vessel at sea. 
1 Gray, Zoology of Erebus and Terror, p. 30 (1846), 
* Gray, Proc. Zool. Soc. 1870, Pp. 7% 
® Gray, Zoology of Erebus and Terror, p. 35 (1846), 
