. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. GILLS OE FISHES. 475 312 communicates with it witliout any intervening valve ; the auricle receives the vein frt)m the air-bladder by a distinct aperture, close to the o]3ening into the ventricle ; regurgitation into the vein being prevented by a hard valvular tubercle, which also projects into the ventricle. The ventricle (fig. h) is single, like the auricle; its inner parietes are very irregular : a ' tra- becula' projects from the lower part of the cavity, like a rudimental septum: a smaller transverse ' tra- becula'
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. GILLS OE FISHES. 475 312 communicates with it witliout any intervening valve ; the auricle receives the vein frt)m the air-bladder by a distinct aperture, close to the o]3ening into the ventricle ; regurgitation into the vein being prevented by a hard valvular tubercle, which also projects into the ventricle. The ventricle (fig. h) is single, like the auricle; its inner parietes are very irregular : a ' tra- becula' projects from the lower part of the cavity, like a rudimental septum: a smaller transverse ' tra- becula' arches over and acts as a valve to the single auriculo-ventri- cular opening, but there are no proper membranous semilunar valves. The muscular parietes of the ' l:)ull)us arteriosus' are distinct in all fishes from those of the ventricle ; they may be overlapped by these, but an aponeurotic septum inter- venes between the origin of the bulb and the overlapping ventricular fibres.' § 84. Gills of Fishes.—The primary division of the branchial artery in the Myxinoids has been already described. Each gill- sac receives, either from tlie trunk or its bifurcations, its proper artery. The leading condition of the gills in other fishes may ha understood by supposing each compressed sac of a Myxine, CirculatiDg and respiratory organs, LepiUusin;li 313 314 Two gill-sacs, SdcUo- stoma. 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 Owen, Richard, 1804-1892; Cornell University. College of Veterinary Medicine. Flower-Sprecher Veterinary Library. fmo. London, Longmans, Green
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