The type of this well-marked genus is _G. melas_, the Pilot Whale, Ca’ing Whale, or Grindhval of the Faroe islanders, which attains the length of 20 feet, and is of nearly uniform black colour, except the middle of the under surface, which is lighter. These animals are extremely gregarious, and, unlike the Killers, are mild and inoffensive in disposition, feeding principally on cephalopods. Their eminently sociable character constantly leads to their destruction, since when attacked they instinctively rush together and blindly follow the leaders of the herd. When they are seen in the neighbourhood of land, the fishermen endeavour to get to seaward of them in their boats, and with shouting and firing of guns to drive them into a bay or fjord, pursuing them until they run themselves on shore in their alarm. In this way many hundreds at a time are frequently driven ashore and killed, when a herd enters one of the bays or fjords of the Faroe Islands or north of Scotland. Animals of this well-marked genus are found in nearly all seas, and their specific distinctions are not yet made out. Specimens from the Australian coasts, where they are generally called “Black-fish,” are quite indistinguishable, either by external or osteological characters, from those of the North Atlantic. [Illustration: FIG. 96.—The left periotic bone of _Globicephalus uncidens_; from the Suffolk Crag. Natural size. The grooved surface on the right is the anterior facet for articulation with the tympanic; the posterior tympanic articulation being on the opposite side of the figure. (From the _Cat. Foss. Mamm. Brit. Mus._ pt. v.)] Teeth, periotic (Fig. 96) and tympanic bones from the Suffolk Crag, described as _G. uncidens_, indicate a form apparently closely allied to the existing species. The periotic is figured in order to illustrate the distinctive characters of that bone in the _Delphinidæ_. _Grampus._[165]—Teeth none in the upper jaw; in the mandible few (3 to 7 on each side), and confined to the region of the symphysis. Vertebræ: C 7, D 12, L 19, C 30; 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. richardsoni_. _Feresia._[166]—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 ¹²⁄₁₂) and much larger size (6-7 mm. in diameter at base of crown) of the teeth.