Bulletin of the American Museum of Natural History Volume 27
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ... ridge of the alisphenoid is well developed (cf. M icrogale). The dentition also is very primitive: the canines remain subcaniniform, p are retained, the upper molars (in Ictops) are of a simple tritubercular type with a low hypocone and narrow anteroposteriorly; the milk dentition persists until the animal has attained adult stature. The common origin of the Erinaceoidea and the Centetoidea is indicated especially by the following characters: In both families the malleus is of the same type, namely with the processus gracilis very broad and perforated by the chords. tympani nerve (Doran, 1879, p. 444), while the incus and stapes in the two families are also closely similar (Doran, l. c., p. 440, pl. 62, figs. 11-14). The base of the cranium in Cenlctes and Erinaceus presents very numerous resemblances recorded above (pp. 244, 245), especially the median pit, the median foramen for the chorda, the strong development of the tympanic wing of the basisphenoid, the course of the three branches of the entocarotid artery and the arrangement of most of the foramina. Leche lays stress upon the similarity in brain structure (1907, p. 121), while Dobson _ (1883) calls attention to important agreements in the musculature. Certain of these similarities may well have been developed independently in the two groups, but taken collectively they leave no doubt of a community of origin. The Miocene Dimylidae of Schlosser, known chiefly from the dentition, appear to be a specialized offshoot of the Erinaceid stem (cf. Zittel 1891-93, p. 568). Chrysochloroidea. This superfamily (pp. 255, 259) is shown to be an offshoot of the stem of the Centetoidea by the peculiar characters of the dentition, the general architecture of the skull, shape of the pelvis, etc....
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