History of North American pinnipeds, a monograph of the walruses, sea-lions, sea-bears and seals of North America . FIG. 30.—Odobcunus rosmarus. Adult. inferior border of the ramus, from the posterior end of the sym-physis to the front of the jaw, rises by a gradual and nearlyuniform curve; in the Pacific Walrus (Fig. 31), the inferior bor-der scarcely rises at all, the jaw in front being simply bluntlyrounded. In respect to the posterior portion of the ramus, thedifferences consist in the greater breadth of the condylar por-tion in the Atlantic species, and the greater thickness of the. FIG.

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History of North American pinnipeds, a monograph of the walruses, sea-lions, sea-bears and seals of North America . FIG. 30.—Odobcunus rosmarus. Adult. inferior border of the ramus, from the posterior end of the sym-physis to the front of the jaw, rises by a gradual and nearlyuniform curve; in the Pacific Walrus (Fig. 31), the inferior bor-der scarcely rises at all, the jaw in front being simply bluntlyrounded. In respect to the posterior portion of the ramus, thedifferences consist in the greater breadth of the condylar por-tion in the Atlantic species, and the greater thickness of the. FIG. 31.—Odobcemis obesus. Adult. coronoid process. These differences are ah1 strongly pro-nounced in even quite young skulls, this being especially thecase with respect to the inferior border of the symphysial por-tion of the jaw (Figs. 32 and 34). Another difference consistsin the position of the coronoid process, which in the PacificWalrus, especially in the young, is central to the axis of theramus, while in the Atlantic species it rises more from the inner 168 ODOB^NUS OBESUS PACIFIC WALRUS.

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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherwashingtongovtprin