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American natural history


American natural history

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    Available in PDF Format | American natural history.pdf | Unknown
    John Davidson Godman
Excerpt from book: CHAPTER III. SECTION II.? INCLAVICULA. textit{The Clavicles incomplete, or entirely wanting. Genus XXX. ? Porcupine : textit{Hystrix : L. textit{Germ. Stachelthier : Stachelschwein. textit{Fr. Pore-epic textit{Port. Ourii:o-cacheiio. GENERIC CHARACTERS. The head is rather short, with an obtuse and somewhat compressed snout, long whiskers, short rounded ears, and small eyes : the upper lip is cleft, and the tongue set with scaly spines. The covering of the body is partly of bristles and partly of prickles or spines. The neck is thick, the belly large, and the limbs of equal length : the anterior have four, ana the posterior five digits, armed with long, stout, curved nails. The tail is either short or of moderate length, and not prehensile. textit{Dental System. 10Lower In The Upper Jaw the incisors are rounded and even in front, and they arise from the anterior and inferior part of the maxillary bone. The molars are of nearly the same size from the first to the last, and they are especially remarkable for the elevation of the crown above the neck of the root. The outline they present is very irregular. In the young animal they are traversed with various degrees of irregularity, by grooves, which, after being worn to a certain extent, begin to be interrupted, and then they exhibit a depression in front on the inside, and another at the back part on the outside : in front, as at the back part, one or two ellipses are seen, the remains of primitive grooves or tubercles. In old animals we find teeth with only one depression, and in the middle, three or four insulated figures, more or less irregular. Vol. II. 3 In The Lower Jaw the incisors resemble those in the upper, and take root some lines below the condyles. The molars have a great general resemblance to ...  
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  • PDF | 292 pages
  • John Davidson Godman
  • General Books LLC
  • Unknown
  • 8
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