. Zoology : for students and general readers . Zoology. 490 ZOOLOGY. The vertebral column is now more distinctly marked oS tlian in the Batrachians ; a cervical and lumbar region being indicated in most reptiles except the snakes and turtles. Well- marked ribs exist in nearly all the vertebrae of the trunk, except in the turtles, where the so-called ribs are possibly, J D f\ \ f\. Pig. 438.—Skull of a Tur- tle seen from behind, 1, tiasi-occipital ; 3, tal; .3, eupraoccipital; 5, basi- spheiioid ; 15, prootic (pe- trosal) ; 17, quadrate.—After Gegeubaur. according to Gegenbaur, modif
. Zoology : for students and general readers . Zoology. 490 ZOOLOGY. The vertebral column is now more distinctly marked oS tlian in the Batrachians ; a cervical and lumbar region being indicated in most reptiles except the snakes and turtles. Well- marked ribs exist in nearly all the vertebrae of the trunk, except in the turtles, where the so-called ribs are possibly, J D f\ \ f\. Pig. 438.—Skull of a Tur- tle seen from behind, 1, tiasi-occipital ; 3, tal; .3, eupraoccipital; 5, basi- spheiioid ; 15, prootic (pe- trosal) ; 17, quadrate.—After Gegeubaur. according to Gegenbaur, modified transverse processes. The skull of reptiles is much, more like that of birds than of Amphibians. There is a single occipital condyle, and the lower jaw is articulated by the quad- rate-bone to the base of the skull. The primitive skull, or that part immediately enclosing the brain, has an incomplete roof, but still is more bony than in Batrachi- ans ; while owing to the great size of the bones developed orig- inally in and from the palato- quadrate cartilage, but a small part of the true skull is to be seen hyoid suspensorium in fislies (hyomandibular and symplectic bones) are, as in the Batrachians, entirely separate from the skull. While the limbs are, as a rule, absent in the snakes, the fore legs always wanting, in a few forms, as the 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
