. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. 16 UNGTJLATA. dentine-islets present trefoils on one side of each tooth; and the upper molars are cingulated. The mandibular symphysis is short and spout-like, and usually edentulous in the adult, although two small incisors are frequently present in the young, one of which is occasionally retained in (probably male) adult individuals. In one variety the enamel of the cheek-teeth is rugose, while in another it is smooth; a small quantity of cement is present in the valleys of the cheek-teeth; premolar
. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. 16 UNGTJLATA. dentine-islets present trefoils on one side of each tooth; and the upper molars are cingulated. The mandibular symphysis is short and spout-like, and usually edentulous in the adult, although two small incisors are frequently present in the young, one of which is occasionally retained in (probably male) adult individuals. In one variety the enamel of the cheek-teeth is rugose, while in another it is smooth; a small quantity of cement is present in the valleys of the cheek-teeth; premolars were apparently not developed. Hab. North America. Fig. Mastodon americanus ; from the Pleistocene of Missouri. Much reduced. *. The skeleton of an adult (woodcut, fig. 3) made up from the bones {Fig.) of several individuals, the incisors and some of the bones being casts ; from the Pleistocene of Benton County, Mis- souri, This specimen was brought to London by Koch in 1843, and is figured in pi. i. of Warren's memoir on Mastodon giganteus (1852). Purchased. About 1844. 345. The cranium, imperfect superiorly, showing m. 3 of either side,. 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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