. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Skull of the Ccelogynus. ner angle there is an excavation resembling a long furrow or semi canal, which is really the infra-orbital canal. The jugal is much higher than it is broad ; the palatine extends into the palate as far forward as the first molar tooth : in the orbit it is almost hidden by the projection of the maxillary ; ne- vertheless, it is interposed between that bone and the sphenoid, and at the posterior extremity of the alveolar arch. In the Guinea-pigs (AiicEnia, Fred. Cuv.; Cavia, Ilig.; Musporcellus, Li
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Skull of the Ccelogynus. ner angle there is an excavation resembling a long furrow or semi canal, which is really the infra-orbital canal. The jugal is much higher than it is broad ; the palatine extends into the palate as far forward as the first molar tooth : in the orbit it is almost hidden by the projection of the maxillary ; ne- vertheless, it is interposed between that bone and the sphenoid, and at the posterior extremity of the alveolar arch. In the Guinea-pigs (AiicEnia, Fred. Cuv.; Cavia, Ilig.; Musporcellus, Lin.), the lachrymal is large ; but it does not entirely form the upper [root of the pre-orbital ring, and the maxillary is not interrupted at this point. The pre- orbital ring is much wider than it is high. We may remark in this genus both the groove of the paca and the fossa of the agouti; but the latter is situated higher up, as in the rats. The ascending branch of the maxillary is long and narrow. The bones of the nose are broader in front than behind- The jugal only commences towards the middle of the zygomatic arch ; the palatine, which superiorly does not penetrate either into the orbit or into the temporal region, extends in the palate only as far forward as the interval between the second and the third molar teeth. In the kerodons, a small point of the frontal insinuates itself above, between the bones of the nose and the intermaxillaries, the ascend- ing branch of the latter being very long, and extremely narrow at its origin, in the Bra- zilian species. In this species, likewise, the pre-orbital ring is oval, and much elongated transversely, but formed entirely in the maxil- lary bone as it is in the Guinea-pig ; whilst in the kerodon of Patagonia the lachrymal forms by itself nearly the whole vertical portion of its arch, so that the lachrymal is necessarily of very great size. Posteriorly, the maxillary touches by its apex a long point derived from the temporal exte
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