. L'histoire naturelle de Cambridge. Zoologie. i56 CHELONIA ci-dessous jaune et sur la gorge, un contraste qui donne cette tortue un aspect frappant. Cette espèce est très vorace, devient facilement apprivoisés, et passe une grande partie de la journée sur terre, caché sous l'herbe pour éviter les grandes chaleurs, et de retrait dans l'eau pour la nuit. Clemmys. - Le plastron est uni à la carapace de manière inamovible, et est dépourvu de charnière transversale. Le crâne a un passage temporel osseux complet. Ce genre, composé de huit espèces, est par ailleurs bien Umys Periarctic, et est vraiment. C. leprosa s de sigr.

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. The Cambridge natural history. Zoology. i56 CHELONIA yellow below and on the throat, a contrast which gives this tortoise a striking appearance. This species is extremely voracious, becomes easily tame, and spends a great part of the day on land, hiding under grass to avoid great heat, and withdrawing into the water for the night. Clemmys. — The plastron is immovably united with the carapace, and is devoid of any transverse hinge. The skull has a complete bony temporal arch. This genus, consisting of eight species, is otherwise very much like Umys, and is truly Periarctic. C. leprosa s. sigris (Fig. 79).—The upper jaw has a median notch for the reception of the upturned point of the lower jaw;. Fig. 80.—Skull of GUmmys leprosa. x f. A, dorsal view ; B, from the left side ; F, frontal; /, jugal; M, maxillary ; Par, parietal; Pr.f, prefrontal ; Pt.f, postfrontal, Q, quadrate, Qj, quadrato-jugal; Sq, squamosal. the cutting edges of the powerful beak are smooth. The shell is flat and long-oval, nowhere serrated. The plastron does not quite fill the box. In the young the shell is nearly round, and the horny shields form three series of keels, of which the lateral pair disappear early ; the shields are olive-brown, each with an orange spot or streak; the plastron is dark brown, with a yellowish margin. The adult looks very different. The shell has become much more oval, with the greatest width behind the bridge. The long shields are smooth, and in elderly specimens are without any trace of the original connective rings of growth. The general colour of the shell is uniform pale olive-grey, inclining to yellow on the plastron. The ground-colour of the soft parts is olive- grey, but the sides of the head are adorned with orange-red or yellow marks, the patch between the eye and ear and three or. 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

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• bookcentury1800
• bookdecade1890
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