. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. MAMMALS^ 401 large, uterus bicornuate; placenta zonary, non-deciduate ; mammae pectoral, two in number. The elephants and their extinct relatives form a most interestino- group, highly dififerentiated in some respects, more generalized in others. Most strange is the proboscis with the nostrils at the tip, while the incisors which furnish most of the ivory of commerce are almost solely dentine the enamel covering the tip being worn off at an early date (elephants), or forming a band on the outer side (^Mastodon"). The Dl
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. MAMMALS^ 401 large, uterus bicornuate; placenta zonary, non-deciduate ; mammae pectoral, two in number. The elephants and their extinct relatives form a most interestino- group, highly dififerentiated in some respects, more generalized in others. Most strange is the proboscis with the nostrils at the tip, while the incisors which furnish most of the ivory of commerce are almost solely dentine the enamel covering the tip being worn off at an early date (elephants), or forming a band on the outer side (^Mastodon"). The DlNOTHERlD^, with the single genus Dinotherium, occur in the miocene and pliocene of Europe and India. In this only the lower incisors are present, and these grow downwards, the symphysis of the jaw being bent so that the teeth form downward-extending tusks. The succession of molar teeth was normal. The animals were about as large as an elephant. In the elephants and their near relatives (Elephantid^) the upper incisors form tusks of varying size, the lower are smaller or wanting. The molars bear more than two transverse ridges, and are subject to horizontal. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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