. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. 16 CETACEA. Older CETACEA. Suborder MYSTACOCETL Functional teeth are wanting and the jjalate is provided with baleen; the cranium is symmetrical; tlie nasals form a roof to the narial passages; and the tympanic is involuted and anchjdosed to the periotic. Family This family includes all the members of the Suborder. A.—Bal^nine Section. At least usually, some or all of the cervical vertebrae are anchy- losed together. The tympanic is deep and angular, its inflation comparatively slight, the
. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. 16 CETACEA. Older CETACEA. Suborder MYSTACOCETL Functional teeth are wanting and the jjalate is provided with baleen; the cranium is symmetrical; tlie nasals form a roof to the narial passages; and the tympanic is involuted and anchjdosed to the periotic. Family This family includes all the members of the Suborder. A.—Bal^nine Section. At least usually, some or all of the cervical vertebrae are anchy- losed together. The tympanic is deep and angular, its inflation comparatively slight, the involucrum^ not fig-shaped, and frequently with no well-marked depression at the anterior extremity of the superior border of the inner surface for the eustachian canal. Genus BAL^SSNA, Linn.' Including Bal(27iula, Van Beneden '^. Balcsnotus, Van Beneden "*.. Balmna mysticetus.—The right tympanic of an immature individual, from the inner (A) and outer (B) aspects; recent. ^. (From the ' Proc. Zool. See.') ^ This terra may be applied to the reflected superior portion of the inner wall of the bone. 2 Syst. Nat. ed. 12, vol. i. p. 105 (1766). 3 Bull. Ac. E. Belg. ser. 2, vol. xxxiv. p. U (1872). * Ibid. p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). Dept. of Geology; Lydekker, Richard, 1849-1915. London, Printed by order of the Trustees
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