History of North American pinnipeds, a monograph of the walruses, sea-lions, sea-bears and seals of North America . FIG. 27.—Odobcenuis obesus. To sum up in a word the above-detailed cranial differencesbetween the two species of Walruses, the skull of the Pacificanimal is heavily developed anteriorly and relatively much lessso posteriorly, while in the Atlantic Walrus just the reverse ofthis obtains, the skull in the latter being heavily developedposteriorly and relatively less so anteriorly. The axis of vari-ation being at the posterior border of the orbital fossae, the 166 ODOBJSNUS OBESUS—P

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History of North American pinnipeds, a monograph of the walruses, sea-lions, sea-bears and seals of North America . FIG. 27.—Odobcenuis obesus. To sum up in a word the above-detailed cranial differencesbetween the two species of Walruses, the skull of the Pacificanimal is heavily developed anteriorly and relatively much lessso posteriorly, while in the Atlantic Walrus just the reverse ofthis obtains, the skull in the latter being heavily developedposteriorly and relatively less so anteriorly. The axis of vari-ation being at the posterior border of the orbital fossae, the 166 ODOBJSNUS OBESUS—PACIFIC WALRUS. zygomata share the general character of the anterior half of FIG. 28.—Odolcenus rosmarus. Adult. But equally striking differences are seen in a comparison ofthe lower jaws of the two species. These differences correlate

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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherwashingtongovtprin