Fishes . e the interopercle, according toBoulenger, is enormously developed. The Notopteridae.—The Notopteridce is another small familyin the rivers of Africa and the East Indies. The body ends ina long and tapering fin, and, as usual in fishes which swim by Isospondyli 275 body undulations, the ventral fins are lost. The belly is doublyserrate. The air-bladder is highly complex in structure, beingdivided into several compartments and terminating in twohorns anteriorly and posteriorly, the anterior horns being indirect communication w-ith the auditory organ. A fossil Notop-terus, N. primccvus,
Fishes . e the interopercle, according toBoulenger, is enormously developed. The Notopteridae.—The Notopteridce is another small familyin the rivers of Africa and the East Indies. The body ends ina long and tapering fin, and, as usual in fishes which swim by Isospondyli 275 body undulations, the ventral fins are lost. The belly is doublyserrate. The air-bladder is highly complex in structure, beingdivided into several compartments and terminating in twohorns anteriorly and posteriorly, the anterior horns being indirect communication w-ith the auditory organ. A fossil Notop-terus, N. primccvus, is found in the same region. The Clupeidse.—The great herring family, or ClupeidcB, com-prises fishes with oblong or herring-shaped body, cycloid scales,and feeble dentition. From related families it is separatedby the absence of lateral line and the division of the maxillaryinto three pieces. In most of the genera the belly ends in aserrated edge, though in the true herring this is not very evident,. Fig. 209 —Herring, Clupea harengus L. New York. and in some the belly has a blunt edge. Some of the specieslive in rivers, some ascend from the sea for the purpose of spawn-ing. The majority are confined to the ocean. Among allthe genera, the one most abundant, in individuals is that ofClupea, the herring. Throughout the North Atlantic are im-mense schools of Cliipca harengus. In the North Pacific onboth shores another herring, Clupea pallasi, is equally abundant,and with the same market it would be equally valuable. Assalted, dried, or smoked fish the herring is found throughoutthe civilized world, and its spawning and feeding-grounds havedeterrhined the location of cities. The genus Clupea, of northern distribution, has the vertebraein increased number (56), and there are weak teeth on the other genera are very closely related, but ranging farthersouth they have, with other characters, fewer (46 to 50) alewife, or branch-herring (Pomolobus pseu
Size: 2810px × 889px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectfishes
