. Sull'anatomia dei vertebrati [risorsa elettronica]. La lamella?, fig. 317, i, e maintainingthem outtensed.2 il numero di piatti su un processo è stato stimato a 55 nel gordgeon, 96 nel tinch, 106 nel barbel, 135 nel Carp, 700 nell'Eel, 1000 nel COD, 1400 nel salmone, 1600 nello Sturgeon. In alcuni pesci ossei alcuni degli archi branchiali supportano solo una serie di processi ; tali sono chiamati e unisionali, o ( mezze branchie ; ma, in generale, supportano biseriali, o 6 integrali. La maggior parte dei Labroidi, i generi Cottus, Scorp&na, Sebastes, Apistes, Zeus, ANT

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. On the anatomy of vertebrates [electronic resource] . he lamella?, fig. 317, i, and maintainingthem outstretched.2 The number of plates on one process has beenestimated at 55 in the Gudgeon, 96 in the Tench, 106 in theBarbel, 135 in the Carp, 700 in the Eel, 1000 in the Cod, 1400 in the Salmon, 1600 in the Sturgeon. In some Osseous Fishes certain of the branchial arches supportonly one series of processes ; such are called e uniserial, or ( halfgills ; but, as a general rule, they support biserial, or 6 wholegills. Most of the Labroids, the genera Cottus, Scorp&na, Sebastes, Apistes, Zeus, Antennarius, Polypterus, Gobiesox, 1 xxm. t. viii. p. 192. 2 For the histology of these structures, see Dr. Williamss minute description incclxviii. pp. 288-290. GILLS OF FISHES. 481 Lepadogaster, and the Cyclopterus liparis have three biserial gillsand one uniserial gill; the genera Lophius, Batrackus, Biodon, Tetrodon, Monopterus, Cotylis, have three biserial gills ; Malthceaand Lepidosiren have two biserial gills and one uniserial gill; the 319 320. Section of branchial arch with a pair of processes, Section of branchial arch, a, with supporting frame-A, supporting the branchial plates, b, Cod. work of the plate-bearing processes, Cod. CCLXVXII. CCLXYIII. Cuchia (Amphipnous) has only two gills. The above enumerationrefers to the branchial organs of one side; they are symmetricalin all fishes, and the uniserial opercular gill is not counted, as notbeing attached to a proper branchial arch. The branchial processes are bony, at least along the outer andthicker border, in most Osseous Fishes (e.g. Salmo, Alosa, Gadus).They are gristly, like the arches which support them, in theSturgeon, where they break up into delicate branched fringes, along their outer margin. Small interbranchial muscles extend, through the uniting septum, between the bases of the processes, for effecting slight reciprocal movements.1 1 CXII. CX1II. VOL. I. II 482 ANATOMY OF VERTEBRATES. The concave borders of the

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• bookcentury1800
• booksubject
• booksubjectbirds
• booksubjectfishes