Grinders 5/5·5/5, large, thick, in a close continuous series; the fifth upper in front of the back edge of the zygomatic arch.
In the younger skull the grinders are placed rather further back, the hinder part of the upper grinder being behind the back edge of the zygomatic arch. The grinders all single-rooted, as the last or sixth grinder in each jaw, which is generally two-rooted, is absent. The face of the skull is considerably produced, and the forehead is flat.
Zalophina, Gray, Ann, & Mag. N. H. 1869, iv. p. 269.
5. ZALOPHUS.
Palate concave, narrow in front, wider at the line of the last grinder, and then contracted behind. The hinder nares narrow, elongate, twice as long as wide, acutely arched in front, front edge in a line with the front edge of the orbital process of the malar bone. Under-fur sparse.
Zalophus, Gill; Peters; Gray, Ann. & Mag. N. H. 1866, xviii. p. 231.
Arctocephalus § b**, Gray, Cat. S. & W. p. 55.
1. Zalophus Gilliespii. Californian Hair-Seal.
Otaria Gilliespii, Macbain.
Arctocephalus Gilliespii, Gray, P. Z. S. 1859, t. 70 (skull); Cat. S. & W. p. 55.