. American animals : a popular guide to the mammals of North America north of Mexico, with intimate biographies of the more familiar species. Mammals -- North America. Introduction the skull comprises the upper jaw, the nasal bones, surrounding the nostrils, and the large eye sockets. The bones forming the roof of the mouth constitute the palate and those forming the. Skull and one side of mandible of Musk Rat. N nasal. F frontal. P parietal. O occipital. Z rygomatic arch. B audita! bulla Mx maxillary, PMx premaxillary. I incisors. M molars. CP coronoid process. CD condyle. A angle. forehead a
. American animals : a popular guide to the mammals of North America north of Mexico, with intimate biographies of the more familiar species. Mammals -- North America. Introduction the skull comprises the upper jaw, the nasal bones, surrounding the nostrils, and the large eye sockets. The bones forming the roof of the mouth constitute the palate and those forming the. Skull and one side of mandible of Musk Rat. N nasal. F frontal. P parietal. O occipital. Z rygomatic arch. B audita! bulla Mx maxillary, PMx premaxillary. I incisors. M molars. CP coronoid process. CD condyle. A angle. forehead are the fronials, while on the posterior portion of the lower part of the skull are two rounded "ear bones" known IS the audital bullet. The Teeth.—The teeth of mammals are divided into four groups, the incisors or cutting teeth placed across the front of the jaws, the canines, four rather elongated teeth placed at the front corners of the jaws, two above and two below, the pre- molars placed immediately behind the canines, and back of these the molars or grinders. Most mammals have two sets of teeth: the milk teeth and the permanent teeth. The former are weaker and are only retained during the early years of the animal's life when they are succeeded by the permanent set. The premolars are represented in the milk dentition, but the molars are not, and that is the reason for separating them. In structure, however, they are quite similar and it is often impossible to distinguish them. The simplest form of tooth is a single-pointed cone, such as we see in the toothed whales; all canine teeth are similar to this in structure, while the incisors are generally more flattened and sometimes slightly lobed. xtx. 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 Stone, Witmer, 1866-1939; Cram, William Everett
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishergardencitynydouble
