. Anatomy of the wood rat; comparative anatomy of the subgenera of the American wood rat (genus Neotoma). Wood rats; Mammals -- Anatomy; Rats -- anatomy & histology; Microtinae -- anatomy & histology. 16 ANATOMY OF THE WOOD EAT dontomys mm.; Neotoma 28 mm.; and Teonoma 29 mm. The width of ear, given in the same order, is , 22, and 25 mm. Hairiness of this member shows individual variation, and variation with age as well. In Teonoma the ears of juveniles especially are better haired than in adults. Hairiness of ear is moderate in all cases, but in old individuals of Homodontomy
. Anatomy of the wood rat; comparative anatomy of the subgenera of the American wood rat (genus Neotoma). Wood rats; Mammals -- Anatomy; Rats -- anatomy & histology; Microtinae -- anatomy & histology. 16 ANATOMY OF THE WOOD EAT dontomys mm.; Neotoma 28 mm.; and Teonoma 29 mm. The width of ear, given in the same order, is , 22, and 25 mm. Hairiness of this member shows individual variation, and variation with age as well. In Teonoma the ears of juveniles especially are better haired than in adults. Hairiness of ear is moderate in all cases, but in old individuals of Homodontomys and Neotoma this member may be practically naked. There is usually a shght covering composed of very fine buffy hairs along the helix, and a sprinkling of slightly darker hairs upon the terminal third or two-fifths of the pinna. The antitragus is double and N VtNN/\. TMt^^W^ — ft NT > H tux -TR^&ViS Fig. 2. Details of external ear of Homodontomys but shghtly indicated (fig. 2), nor is the tragus strongly formed. The subhelix consists of a light cartilaginous fold well within the conch, and the antihelix takes the form of a low ridge. Variation in the form of the ear between the three subgenera is not appreciable. In all females of the genus Neotoma there are two pairs of inguinal teats, located close together and somewhat sug- gestive of the mammae of a young heifer. Ventral dermal gland. As previously mentioned the males of Teonoma exhibit a thickened dermal area midventrally which may have a width of 70 mm. and a breadth of 35 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 Howell, A. Brazier (Alfred Brazier), 1886-. Baltimore, The Williams & Wilkins Company
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Keywords: ., bookc, bookcentury1900, bookdecade1920, booksubjectmammalsanatomy
