. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. TELEOSTEI. 383 tractile, and is separated from the ventricle by no more than a single row of valves (fig. 142, A).. â Fig. 142.âA, Heart of the Angler i^Lophius Hscatorius). B, Arterial bulb of Bony Pike {Lepidosteris) cut open. C, Heart of the same, viewed externally; a Auricle : V Ventricle; h Arterial bulb. V. The respiratory organs consist of free, pectinated, or tufted branchiae, situated in two branchial chambers, each of which communicates internally with the pharynx by a
. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. TELEOSTEI. 383 tractile, and is separated from the ventricle by no more than a single row of valves (fig. 142, A).. â Fig. 142.âA, Heart of the Angler i^Lophius Hscatorius). B, Arterial bulb of Bony Pike {Lepidosteris) cut open. C, Heart of the same, viewed externally; a Auricle : V Ventricle; h Arterial bulb. V. The respiratory organs consist of free, pectinated, or tufted branchiae, situated in two branchial chambers, each of which communicates internally with the pharynx by a series of-clefts, and opens externally on the side of the neck by a single aper- ture (or " gill-slit"), which is protected in front by a bony gill- cover, and is also closed by a " branchiostegal membrane," sup- ported upon " branchiostegal ; The branchias are attached to a series of bony branchial arches, which are connected in- feriorly with the hyoid bone and superiorly with the skull; and the water required in respiration is taken in at the mouth by a process analogous to swalfowing. VI. The nasal sacs never communicate posteriorly with the cavity of the pharynx. The subdivisions of the osseous fishes are so numerous, and they contain so many families, that it will be sufficient to run over the more important sub-orders, and to mention the more familiar examples of e^ch. Sub-order A. Malacopteri, Owen (= Physostomata, Miil- ler),âThis sub-order is defined by usually possessing a com- plete set of fins, supported by rays, all of which are 'â 'â soft" or many-jointed, with the occasional exception of the first rays in the dorsal and pectoral fins. A swim-bladder is always present, and always communicates with the oesophagus by means of a duct, which is the homologue of the â wfindpipe. ⢠The skin is rarely naked, and is mostly furnished with cycloid scales; but in some cases ganoid plates are present This sub-order is one of g
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