File:Fishes (1907) (14777170862).jpg

Identifier: fishes00jord (find matches)
Title: Fishes
Year: 1907 (1900s)
Authors: Jordan, David Starr, 1851-1931
Subjects: Fishes
Publisher: New York, H. Holt and Company
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Smithsonian

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The Dissection of the Fish 27 Next it flows into the thick-walled ventricle, whence by therhythmical construction of its walls it is forced into an arterialbulb which lies at the base of the ventral aorta, which carriesit on to the gills. After passing through the fine gill-filaments,it is returned to the dorsal aorta, a large blood-vessel which ex-tends along the lower surface of the back-bone, giving out branchesfrom time to time. The kidneys in fishes constitute an irregular mass under theback-bone posteriorly. They discharge their secretions throughthe ureter to a small urinary bladder, and thence into the uro-genital sinus, a small opening behind the anus. Into the samesinus are discharged the reproductive cells in both sexes. In the female sunfish the ovaries consist of two granularmasses of yellowish tissue lying just below and behind the swim-bladder. In the spring they fill much of the body cavity andthe many little eggs can be plainly seen. When mature theyare discharged thr

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