History of North American pinnipeds, a monograph of the walruses, sea-lions, sea-bears and seals of North America . FIG. 15.—OdolxEnus rosmarus. The skulls of the two species seen in profile (Figs. 14 and 15)exhibit the following- differences: The first and most obvious 158 ODOB^NUS OBESUS PACIFIC is perhaps that presented by the tusks, which, in the Pacificspecies (Fig. 14), are much longer and thicker than in the other (Fig. 15), less incurved andmore convergent; their alve-oli are deeper and thicker,with heavier walls, therebygiving much greater fullnessto the front wall of the sku
History of North American pinnipeds, a monograph of the walruses, sea-lions, sea-bears and seals of North America . FIG. 15.—OdolxEnus rosmarus. The skulls of the two species seen in profile (Figs. 14 and 15)exhibit the following- differences: The first and most obvious 158 ODOB^NUS OBESUS PACIFIC is perhaps that presented by the tusks, which, in the Pacificspecies (Fig. 14), are much longer and thicker than in the other (Fig. 15), less incurved andmore convergent; their alve-oli are deeper and thicker,with heavier walls, therebygiving much greater fullnessto the front wall of the skull,I even modifying the form of| the nasal bones. The frontoutline, as seen in profile, isvery oblique in the Atlanticspecies, while in the Pacificspecies it is nearly vertical,the front edge of the nasalbones being very little poste-rior to the front border of thebase of the tusk, while in theAtlantic species they scarcely FIG. 16.— OdobivHu* ru*>n«rus. pass beyond a vertical line drawn from the hinder border of the tusk. The orbits in the Pacific species areplaced more ante-riorly than in theother. In the front viewof the skulls, themuzzle is seen to bemuch smaller in theAtlantic species(Fig. 16) than in thePacific (Fig. 17),with, however, notvery marked differ-ences in outlines andproporti
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