. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. niOU SCHOOL ZOOLOGY. 63 young, and is only afterward closed. It is filled with air from certain blood-vessels which are so arranged as to allow an in- terchange between the gases of the blood and those of the air- bladder. However groat the difrei*ence in this way between Physostomous and Physoclystous Teleosts, yet there are some of the latter which are transitional in other respects. The family of the Scomberesocidae recalls both the Pikes (Esocidae) and the Mackerels (Scombridae). In addition to the l
. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. niOU SCHOOL ZOOLOGY. 63 young, and is only afterward closed. It is filled with air from certain blood-vessels which are so arranged as to allow an in- terchange between the gases of the blood and those of the air- bladder. However groat the difrei*ence in this way between Physostomous and Physoclystous Teleosts, yet there are some of the latter which are transitional in other respects. The family of the Scomberesocidae recalls both the Pikes (Esocidae) and the Mackerels (Scombridae). In addition to the long-billed marine Gar-fishes, several interesti'''^ species of Flying-fish, Exocoetus (Fig. 30), belong to it, marked by the great size of the pectoral (and ventral) fins. These creatures throw themselves out of the water by means of the strong muscles of the tail, and sustain themselves in the air by spreading the Fig. 30.—California Flying Fisli. Exocaetus Califomiensis. J. (U. S. F. C.) 16. Before discussing the typical Physoclystous fishes a passing refer- ence may be made to certain aberrant forms which attract attention by the peculiarity of their shape. The Pipe fishes (Sjmgnathus), and Sea- horses (Hippocampus) (Fig. 31), agree with each other in the structure of their gill-filaments, which arc arranged in tufts (Lophobranchii), like the teeth of a comb. The snout is much produced, uiie mouth toothless and the gill-cover a single plate. The Tobacco-pipe fishes (Fistularia) have the ordinary gill-structure, but share the elongated body and produced snout of the pipe-fishes. Allied to them are the Sticklebacks (Oasteros- teida) of fresh and brackish waters (Fig. 32), a group of tiny pugnacious fishes which live on the fry of larger fish, but take care of their own in a nest which is constructed and defended by the male. Some of the species have regular bony plates on the side of the body: th<:;se however, are absent in our common nine-spined and Brook Stickleb
Size: 2570px × 972px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
