. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. -:>^ CLASSIFICATION Of VERTEBRATES. Gasterosteid-E : bodv naked or with bony plates : dorsal with spines : teeth sharp, in jau s alone; anal with one spine: fresh and brackish water. GasUrosUiu. Aptltes. srxklebacks. Centriscid^, two dorsals, the first spiny: marine. FiSTi'LARiiD^E. bony plates are present; the dorsal is without spines : snout produced into a tube : the species are marine. Fistii- laria has persisted since the eocene. The extinct Dercetidj; iBelonor- hytuhus, Saurorhamphus from the cretaceous i show relat
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. -:>^ CLASSIFICATION Of VERTEBRATES. Gasterosteid-E : bodv naked or with bony plates : dorsal with spines : teeth sharp, in jau s alone; anal with one spine: fresh and brackish water. GasUrosUiu. Aptltes. srxklebacks. Centriscid^, two dorsals, the first spiny: marine. FiSTi'LARiiD^E. bony plates are present; the dorsal is without spines : snout produced into a tube : the species are marine. Fistii- laria has persisted since the eocene. The extinct Dercetidj; iBelonor- hytuhus, Saurorhamphus from the cretaceous i show relations towards Belonc. ORDER V. LOPHOBRAXCHII. Teleosts with hemibranch ances- tr}': bodv armored with segmented bony armor: snout elongate : tooth- less : operculum a single plate; gills composed of small rounded tufts : air-bladder simp'.e, physoclistous : shoulder girdle connected with the cranium. large gill openings : two dorsals and ventral fins. Solenorhyn- cJius. eocene: Solcnosloina. eocene of Europe and Pacific Ocean to-day. The females carrv the eggs and \ in a brood pouch formed by the ventral rins and the abdominal or cau- dal surface. appears in the middle tertiary: gill opening very ; a single dorsal fin and the ventrals absent. Sygnatlius and Sipiiostoma, pipe-fish, have a caudal fin. In Hippoca!>:pus, sea-horses, the tail is prehensile and the caudal ab- Fig. 250. Sea-horse, Hip/ - cj m * us ie^'i'iWi nus, after Goode. ORDER VI. ACAXTHOPTERYGII (AC-\XTHOPTERI I. Gilis laminate; ctenoid or cycloid scales; premasillaries forming the border of the mouth ; shoulder girdle connected to the cranium by a (^usually forked) post-temporal; ventrals gen- erally far forward, usually attached to the shoulder girdle bv means of the pelvis : the anterior rays of pectorals, ventrals. dorsal or anal fins, usually osseous spines. Here belong the great majority of marine teleosts. Judging from vertebral char- acters and the suspe
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