A treatise on zoology . Fig. ^..!< rhaerorcplwlus, Blkr. (After Day, Fi!-h:s of India.) Family Ostracioxtidae. Trunk- or Cofler-Fish, with longnarrow teeth. The carapacelias an almost vertical front edge,angular sides, and often largefrontal and anal horns. Ostracion, L. ; tropical seas ;Eocene, Europe. Aracana, Gr. ;Ladophrys, Sw.—tropical seas. Branch 2. Triodoxtidae. A familyintermediate between the firstand third sub-groups, whose exactposition it is difficult to deter-mine. The teeth coalesce into abeak, single below but pairedabove. The spinous dorsal an
A treatise on zoology . Fig. ^..!< rhaerorcplwlus, Blkr. (After Day, Fi!-h:s of India.) Family Ostracioxtidae. Trunk- or Cofler-Fish, with longnarrow teeth. The carapacelias an almost vertical front edge,angular sides, and often largefrontal and anal horns. Ostracion, L. ; tropical seas ;Eocene, Europe. Aracana, Gr. ;Ladophrys, Sw.—tropical seas. Branch 2. Triodoxtidae. A familyintermediate between the firstand third sub-groups, whose exactposition it is difficult to deter-mine. The teeth coalesce into abeak, single below but pairedabove. The spinous dorsal andthe pelvic fins have disappeared,there is a dilatable oesophagealsac. Yet a movable pelvis ispresent as in the Balistidae, whichthey resemble in many charactersof the skeleton. There are twentyvertebrae, and the body is coveredwith small spiny plates. Triodon, Keinw. ; E. Indies. Branch 3. sot lOt. Fin. 451. Chilomycterus reticulatus, L. Porcupine fisli;from specimen-s in British Museum. Verticalmedian section of both jaws, , alveolar cavityin which young teeth develop ; , grindingThere are no normal scales, no surface formed by inner set of old tooth-plates ;. T . „ I . „ , grinding surface formed by outer set of old dorsal spinous hn, no pelvic hn tooth-plates; , young tooth-plates. 440 TELEOSTEI or girdle, no epipleurals, and no parapophyses. The teeth when presentare fused into plates in which vertical succession takes place (Figs. 451,453). The basis cranii is simple ; the interoperculum rod-like and con-cealed ; the suture between the dentarv and articular remains, also a
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
