File:History of North American pinnipeds - a monograph of the walruses, sea-lions, sea-bears and seals of North America (1880) (14741494276).jpg

Identifier: historyofnortham00alleuoft (find matches)
Title: History of North American pinnipeds : a monograph of the walruses, sea-lions, sea-bears and seals of North America
Year: 1880 (1880s)
Authors: Allen, J. A. (Joel Asaph), 1838-1921
Subjects: Pinnipedia -- North America Mammals -- North America
Publisher: Washington : G.P.O.
Contributing Library: Earth Sciences - University of Toronto
Digitizing Sponsor: MSN

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* Says Wiegmann: Hr. Fremery fiilirt an, dass Hr. Temminck einen (nachDentlichkeit der Niilite) uocli jungen Scliiidel des EeicJismnseums mit aus-gezeiciinet laugen dlinnen Stosszalmen fiir den eines Weibchens gelialtenhabe. Icli erinnere micli aucb. von Gronlandsfabron gebort zu baben, dass sicbdas Weibcben diucb liiugere, diinnere, das Miinnclien durcb. kiirzere, aber vieldickere Stosszlibno auszeicbne. Die geringere Entwickluug der Hinter-hauptleiste, die geringere Scbwere der Knocben, selbst das Zuriickbleiben deshintersten Backenzabiies im Oberkiefer konnte, wenn es wixklicb nur sexu-elle Verscbiedenbeit sein sollte, mit Analogien belegt werdeu.—Arch, furNahmjescli., 1832, pp. 123, 129. tMuIlers Arcb. fiir. Anat., 1844, p. 392. SEXUAL DIFFERENCES. 41 tusks (see fig. 1) is doubtless abnormal, and is doubtless owingto their unsymmetrical development and overlapping at tbepoints, whicli must have interfered to some extent witli theiruse, and hence have preserved them from wearing.
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Fig. 1.—Odobccnus rosmarus, 5. In the National Museum at Washington a,ve also four skulls,which, though unmarked as to sex, are unquestionably those of 42 ODOB^NUS ROSMAEUS ATLANTIC WALEUS. females.* They agree witli tlie 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 comj)ared with male skulls of correspond-ing age.t The closed sutures show that they belonged to agedindividuals, but in other respects might be iiresumed to be skullsof young animals, for which such skulls are doubtless usuallymistaken.

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