. Elements of comparative anatomy. Anatomy, Comparative. tor!? Fig. 246. Skull of the Frog. A from above. B from below. C from behind. D from the side. In A and B the covering bones are removed from the right half of the cranium, so that the whole of the primordial cranium and its ossifications can be seen, and, in A, the spaces in the roof of the cranial cavity. Pa Fr. Fronto-parietals. Na Nasal. Bs Parasphcnoid. Ty Tympanic. Ft Pterygoid. Bl Palatine. Vo Vomer. J Jugal. Mx Maxilla. Pas Premaxilla. o Exoccipital. Be Prootic. co Occipital condyle. Co Columella, fo Fenestra ovalis. Exits of the
. Elements of comparative anatomy. Anatomy, Comparative. tor!? Fig. 246. Skull of the Frog. A from above. B from below. C from behind. D from the side. In A and B the covering bones are removed from the right half of the cranium, so that the whole of the primordial cranium and its ossifications can be seen, and, in A, the spaces in the roof of the cranial cavity. Pa Fr. Fronto-parietals. Na Nasal. Bs Parasphcnoid. Ty Tympanic. Ft Pterygoid. Bl Palatine. Vo Vomer. J Jugal. Mx Maxilla. Pas Premaxilla. o Exoccipital. Be Prootic. co Occipital condyle. Co Columella, fo Fenestra ovalis. Exits of the nerves : 0 Optic. Tr Tri- geminus. Y'j Vagus. In the lower jaw: da Dentary. a Angular. Art Articular. tions of an epiotic. The fenestra ovalis is a cleft in the region of the labyrinth, which is covered over by a small piece of bone. In the anterior portion of the orbital region there are sometimes more or less extensive ossifications. They either embrace the lateral wall only of the cranium (Siredon), or form a circular piece of bone, to which Cuvier gave the name of " ; This bone may extend into the ethmoidal region, and even reach to the base of the nasal capsules. The paired parietals and frontals are covering bones. In the Anura these fuse together on either side to form a fronto-parietal (Pa Fr). In front of these, and separated from one another by the frontals, are the nasals, which we now meet with as constant. 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 Gegenbaur, C. (Carl), 1826-1903; Bell, F. J. (Francis Jeffrey), 1855-1924; Lankester, E. Ray (Edwin Ray), Sir, 1847-1929. London, Macmillan and Co.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectanatomycomparative
