. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. c, vue latérale d'un cerveau de tortue ; 1, 2 ; tractus optique d'hypertension, de cms. d, la même : a. partie du nerf optique a été enlevée pour montrer le passage d'hypertension crus vers le haut. {Après Swan.*) de la moelle épinière. La face inférieure du cerveau est presque lisse, ne présentant pas d'autres élé- vations que ceux formés par l'union des nerfs optiques et par le tubercule non identifiées. Comme il n'y a pas de lobes latéraux au cervelet, bien sûr, pas de traces d'un pons varolii existent. Comme chez les oiseaux, une inflation vasculaire, qui semble représenter la

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. c, lateral view of the brain of a turtle; 1, optic tract; 2, cms cerebri. d, the same: a. portion of the optic nerve has been removed to show the crus cerebri passing upwards. {After Swan.*) spinal chord. The inferior surface of the brain is almost smooth, presenting no other ele- vations than those formed by the union of the optic nerves and by the tuber cinereum. As there are no lateral lobes to the cerebellum, of course no traces of a pons varolii exist. As in birds, a vascular inflation, which seems to represent the fissure of Sylvius, separates each hemisphere into two lobes, into the posterior of which the lateral ventricle pe- netrates. The pineal and pituitary bodies are met with in all reptiles. In the C/ielonian reptiles the cerebral he- mispheres contain as usual a ventricle, in which may be perceived a body analogous to the corpus striatum, presenting an arrange- ment very similar to what is observed in birds, only it is much less voluminous, S3 as to occupy a small portion comparatively of the interior of the ventricle. The crura ce- rebri, when they reach the lobes of the hemi- spheres, do not, as in mammalia and in birds, immediately dilute into large ganglia, but curving upwards and backwards, expand on each side into a tubercle, which is the corpus striatum. The optic thalami are very small, but the pineal gland which lies upon them is of considerable bulk. The bigeminal tubercles are of a rounded form, and instead of being separated from each other by a slight groove, as in the mam- malia, a deep fissure is interposed between them which penetrates to the roof of the aqueduct, and contains a fold derived from the pia mater. The cerebellum is nearly hemispherical in its form, consisting of an arched layer of nervous substance of equal thickness throughout, which spreads over a portion of the fourth ventricle. The remainder of that cavity is covered by a vascular plexus, derive

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