. A text-book of agricultural zoology. Zoology, Agricultural; Zoology, Economic. 332 SAUROPSIDA. instance, the Common English Adder, which normally retains the ova in the uterus until they are incubated. Many Eeptilia 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 jNIammalia, but are im- planted in one long groo
. A text-book of agricultural zoology. Zoology, Agricultural; Zoology, Economic. 332 SAUROPSIDA. instance, the Common English Adder, which normally retains the ova in the uterus until they are incubated. Many Eeptilia 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 jNIammalia, but are im- planted in one long groove near the edge of the jaw. There are four existing the Chelonia, or Tortoises and the Ophidia, or Snakes;. Fig. 170.—Pleurojjont and Acrodoxt Dentition. i, Pleurodont dentition (in crocodiles, &c.); ii, acrodont dentition (note teeth ancliylosed to the bone). (Brit. JIus. Guide.) groups of Eeptiles — namel}'-. Turtles ; the Lacertilia, or Lizards. 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
