Bulletin of the Bureau of Fisheries . nd dorsal to the ventricle. Its lateral anglesproject somewhat ventrad upon the sides of the bulbus arteriosus, and it opens intothe ventricle by the auriculoventricular aperture, which is a transverse, ellipticalopening with a two-lipped valve. The ventricle is thick-walled, and shaped like atriangular pyramid with the apex directed caudad. The bulbus arteriosus, which isquite large, extends craniad from the base or cranial portion of the ventricle, andtapers into the ventral aorta. The valve between the ventricle and bulbus consistsof two segments and is
Bulletin of the Bureau of Fisheries . nd dorsal to the ventricle. Its lateral anglesproject somewhat ventrad upon the sides of the bulbus arteriosus, and it opens intothe ventricle by the auriculoventricular aperture, which is a transverse, ellipticalopening with a two-lipped valve. The ventricle is thick-walled, and shaped like atriangular pyramid with the apex directed caudad. The bulbus arteriosus, which isquite large, extends craniad from the base or cranial portion of the ventricle, andtapers into the ventral aorta. The valve between the ventricle and bulbus consistsof two segments and is of the usual semilunar type. According to Boas (1880), thesmall region between the bulbus and ventricle, in which the valve is situated, corre-sponds to the conns arteriosus of the elasmobrauch heart. • THE VENTRAL AORTA AND THE AFFERENT BRANCHIAL ARTERIES. The ventral aorta (tigs. It; and 18, pi. I) extends craniad as a continuation ofthe bulbus arteriosus, and after giving off, in the order named, the fourth, Fig. 1.—Efferent branchial vessels of tile-fish (Lnpholatilus charmdeanticeps), with cireuluscephalicus. Ventral aspect, natural size. On the left side the hyoidean and afferentpseudobranchial arteries are shown: on the right side the efferent pseudobranohialartery. and second pairs of afferent branchial arteries, bifurcates at its cranial end to formthe first pair of afferent vessels. On each side the third and fourth afferent branchialarteries arise from a common stem. The second pair arise as separate vessels. THE EFFERENT BRANCHIAL ARTERIES. The efferent branchial arteries (i to iv, tigs. 16 and IS, pi. i) correspond pairlor pair with the afferent vessels just described. They converge, one from each gill BLOOD-VASCFLAR SYSTEM OF THE TILE-FISH. 91 arch, and run mesad; the first and second pairs unite to form the first aortic root (fig. 4,,1/. /). while the third and fourth similarly unite to form the second [Ar. ..). Theaortic roots of each s
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfisheries, bookyear19
