. A manual of zoology. 3tn PHYLUM CHORDATA 4S1 the cavity of the eye from the entrance of the optic nerve. The auditory organ (Fig. 291) is chiefly distinguished from that of reptiles by the great development of the cochlea. The tympanic cavity and columella have the same arrange- ment as in the frog; the narrow Eustachian tubes open by a common aperture (Fig. 287, eus. ap) in the roof of the pharynx. The kidneys (Fig. 287, kd, Figs. 292 and 293, k) have a very characteristic form. Each is a flattened organ divided into three main lobes and fitted closely into the hollows of the pelvis. The ur
. A manual of zoology. 3tn PHYLUM CHORDATA 4S1 the cavity of the eye from the entrance of the optic nerve. The auditory organ (Fig. 291) is chiefly distinguished from that of reptiles by the great development of the cochlea. The tympanic cavity and columella have the same arrange- ment as in the frog; the narrow Eustachian tubes open by a common aperture (Fig. 287, eus. ap) in the roof of the pharynx. The kidneys (Fig. 287, kd, Figs. 292 and 293, k) have a very characteristic form. Each is a flattened organ divided into three main lobes and fitted closely into the hollows of the pelvis. The ureters (i/r) are narrow tubes passing directly backwards to open into the middle compart- ment, or the cloaca. FA. *?~lag outer aspect; FA, ampulla of posterior canal: FB, posterior canal; HA, ampulla of hori- zontal canal: HB, horizontal canal; lag; cochlea or lagena; tnr, membrane of Reissner; ph, basilar part of cochlea; S, sacculus ; SA, ampulla of anterior canal; SB, anterior (canal. From Wiedersheim, af- ter Hasse.) The testes (Figs. 287 and 292, Fig. 291. — Coiumba livia. The right membranous labyrinth is) are ovoid bodies, varying greatly in size according to the season, attached by the perito- neum to the ventral surfaces of the anterior ends of the kidneys. From the inner border of each goes off a convoluted vas def- erens (vd), which passes backwards, parallel with the ureter, to open into the cloaca on the extremity of a small papilla. The posterior end of the spermiduct is slightly enlarged to form a vesicula seminalis {). The female organs (Fig. 293) are remarkable for the more or less complete atrophy of the right ovary and oviduct. 21. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New Yor
Size: 1232px × 2027px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1900
