. A text-book of agricultural zoology. Zoology, Economic. 332 SAUEOPSIDA. instance, the Common English Adder, which normally retains the ova in the uterus until they are incubated. Many Eeptijia are provided with numerous teeth, some being connected with poisonous glands at their base (fig. 171, d). The poison-fangs have a tube run- ning up them, through which the poison is ejected when the snake bites. Teeth of reptiles, except in the Crocodiles (fig. 170, i and ii), are not lodged in sockets, as we see is the case in the Mammalia, but are im- planted in one long groove near the edge of the j
. A text-book of agricultural zoology. Zoology, Economic. 332 SAUEOPSIDA. instance, the Common English Adder, which normally retains the ova in the uterus until they are incubated. Many Eeptijia are provided with numerous teeth, some being connected with poisonous glands at their base (fig. 171, d). The poison-fangs have a tube run- ning up them, through which the poison is ejected when the snake bites. Teeth of reptiles, except in the Crocodiles (fig. 170, i and ii), are not lodged in sockets, as we see is the case in the Mammalia, but are im- planted in one long groove near the edge of the jaw. There are four existing groups of Reptiles — namely, the Qhelonia, or Tortoises and Turtles; the Lacertilia, or Lizards; the Ophidia, or Snakes;. Fig. 170.—Pleurodont and Acrodokt Dentition. i, Plevirodont dentition (in crocodiles, &c.); ii, acrodont dentition Qiote teeth anchylosed to the hone). (Brit. Mus, Guide.). 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
