. History of North American pinnipeds, a monograph of the walruses, sea-lions, sea-bears and seals of North America . FIG. 1.—Odobanus rosmarm, $ . In the National Museum at Washington are also four skulls,which, though unmarked as to sex, are unquestionably those of 42 ODOB^ENUS EOSMARUS ATLANTIC WALRUS. females.* They agree with the one already described as tosmall size, the absence of well-developed crests and ridges formuscular attachment, small, slender tusks, and general weak-ness of structure, as compared with male skulls of correspond-ing The closed sutures show that they belonge
. History of North American pinnipeds, a monograph of the walruses, sea-lions, sea-bears and seals of North America . FIG. 1.—Odobanus rosmarm, $ . In the National Museum at Washington are also four skulls,which, though unmarked as to sex, are unquestionably those of 42 ODOB^ENUS EOSMARUS ATLANTIC WALRUS. females.* They agree with the one already described as tosmall size, the absence of well-developed crests and ridges formuscular attachment, small, slender tusks, and general weak-ness of structure, as compared with male skulls of correspond-ing The closed sutures show that they belonged to agedindividuals, but in other respects might be presumed to be skullsof young animals, for which such skulls are doubtless FlG. 2.—Odobcenus rosmarus, $ . From these data it seems fair to conclude that there are well-marked sexual differences among Walruses, manifested espe-cially in the inferiority of size of the female, in the comparativelyweak development of the bones of the skull, the smaller size ofthe bones of the general skeleton, and in the size and form ofthe tusks. These differences are, in short, just such as, fromanalogy, one would naturally expect to exist, and confirm the * This I inferred from their small size and light structure, aud was pleasedto have my determination confirmed by so competent an authority as Bessels, who pronounced them to be unquestionably those of Besselss judgment, it is perhaps needless to say, is based on personalexperience while on the Polaris Expedition, during whi>h he secured andprepared numerous specimens of both sexes, which were lost with the ill--fated vessel. tin the National Museum there is also a female skull of the Pacific Walrus
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