. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. 576 EMBRYOLOGY OF THE TURTLE. Part IIL 4a, w-c. 4a, 10, Wood-cut 3. A A nt e' f C f g ff' D K g" k M F i' n' k". u' s^ rff it m u'^ v r Wood-cut 4. It; t u i' spheres (fig. 8, corpora 3, c, w-c. 4, c) is much larger and longer. Tlie olfactory bulb (fig. 4, w-c. 3, d, w-c. 4, d, w-c. 10, a, a') is distinctly striated by broad bands of white and gray matter; and it is more enlarged, and en- .. '' croaches still more upon the ;'.'..-J rather diminished hemisp
. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. 576 EMBRYOLOGY OF THE TURTLE. Part IIL 4a, w-c. 4a, 10, Wood-cut 3. A A nt e' f C f g ff' D K g" k M F i' n' k". u' s^ rff it m u'^ v r Wood-cut 4. It; t u i' spheres (fig. 8, corpora 3, c, w-c. 4, c) is much larger and longer. Tlie olfactory bulb (fig. 4, w-c. 3, d, w-c. 4, d, w-c. 10, a, a') is distinctly striated by broad bands of white and gray matter; and it is more enlarged, and en- .. '' croaches still more upon the ;'.'..-J rather diminished hemispheres, (fig. 4, 4a, 8, w-c. 3, e, w-c. 4, »' e, w-c. 8, a) than before. The cavity of the latter is nearly filled by the choroid plexus (fig. 4a, 8, w-c. 4, e, w-c. 8, d); and the optic lobes (fig. 4, 4a, 8, 9, w-c. 3, h, w-c. 8, /, /') are »' r ,i"p',,'i' 5 f , again on a Uttle higher level than the fourth ventricle, (w-c. 3, 2,) and advanced so as to underlie the greater part of the hemi- spheres (fig. 4, 4a, 8, w-c. 3, e, w-c. 4, e, w-c. 8, a). I, The optic nerve (fig. 4, 4a, w-c. 3, //) is as yet very short, passing almost immediately from the optic lobe into the eye. The pineal gland (fig. 4, 4a, w-c. 3, /, w-c. 4, /) is a solid mass, sunk '' considerably below the upper surface of the hemi- and of the corpora quadrigemina. The crura cerebri 9, w-c. 8, a") are already quite prominent. The striata (fig. 8, 9, w-c. 8, a, w-c. 9 a) project con- siderably into the cavity of the hemispheres. The corpora quad- rigemina (fig. 4, 4a, 7, w-c. 3, (/, (/', w-c. 4, ff, w-c. 7, a, a) have / much thicker walls, and are more sunk posteriorly toward cw the fourth ventricle. The cere- ' bellum (fig. 4, 4a, 6, w-c. 3, k, w-c. 6, a, a, a") is very much enlarged; it has a much thicker wall, and trends almost perpen- dicularly to the axis of the brain, upward from its anterior border (w-c. 6, a"). The arach-. Please note that these images are extracted from scanned page i
Size: 1981px × 1262px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdeca, booksubjectanimals, booksubjectzoology
