. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. rectal vestibule (/») : beneath this lies the part analogous to the urinary bladder (c d). Lower than the urinary sac are found the two openings of the ureters (/» /*), with the pervious oviduct on the left side (/'), and the remains of the impervious oviduct (g) on the right side. The bursa Fabricii and the clitoris (when present) are placed more posteriorly in the preputial cavity. The most distinct forms of these gene- rative and urinary parts, and the nearest ap- proach to the mammalia are seen in the cloaca of the o
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. rectal vestibule (/») : beneath this lies the part analogous to the urinary bladder (c d). Lower than the urinary sac are found the two openings of the ureters (/» /*), with the pervious oviduct on the left side (/'), and the remains of the impervious oviduct (g) on the right side. The bursa Fabricii and the clitoris (when present) are placed more posteriorly in the preputial cavity. The most distinct forms of these gene- rative and urinary parts, and the nearest ap- proach to the mammalia are seen in the cloaca of the ostrich (fig. 50), where the rectum (a) opens into a wide and distinct rectal vestibule (b), which extends into a large urinary bladder (d). Beneath the urinary bladder is the ure- thro-sexual canal (e), into which the two ureters Fig. (h k h* h*) and the oviducts (f f* f* g) open towards the dorsal and lateral part. The pre- putial cavity (i) is the terminal portion in which the distinct clitoris is here lodged. The ova are impregnated internally, their chorion is calcined, and their development is effected by incubation. (See AVES.) 23. Mammalia, warm and red-blooded ver- tebrata, having four cavities of the heart, with a viviparous mode of generation, and possessing mammary glands; with the lungs free in a distinct thoracic cavity, and generally having the body more or less covered with hair. The bodies of their vertebrae unite by rial surfaces, the tympanic bone is fixed, the jaws are gene- rally furnished with teeth lodged in deep alveoli, the coracoid bone rarely reaches the sternum, and the posterior extremities, when present, are always attached by the pelvic arcVi to a solid sacrum. The thoracic and abdominal cavities are separated by a muscular diaphragm. The hemispheres of the brain contain large ventri- cles, and rarely want convolutions, the optic lobes are small, concealed, solid, and divided by a transverse suleus, the commissures of the brain and cerebell
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