. On the anatomy of vertebrates [electronic resource] . Superficial and looped vessels of the vaso-ganglionair-bladder, Cod. cclxviii. with fine villiform blood returns from the vaso-ganglions by small veins which rarely accompany, more commonlycross, the arteries. 4. The two chief (retia mirabilia, or vaso-ganglions, in the air-bladder of the Eel and Conger, which aresituated at the sides of the opening of the air-duct, are alsoe bipolar, and consist of both arterioles and venules: they consistof straight parallel capillaries, as in fig. 329 : their efferent trunksdo not ramify
. On the anatomy of vertebrates [electronic resource] . Superficial and looped vessels of the vaso-ganglionair-bladder, Cod. cclxviii. with fine villiform blood returns from the vaso-ganglions by small veins which rarely accompany, more commonlycross, the arteries. 4. The two chief (retia mirabilia, or vaso-ganglions, in the air-bladder of the Eel and Conger, which aresituated at the sides of the opening of the air-duct, are alsoe bipolar, and consist of both arterioles and venules: they consistof straight parallel capillaries, as in fig. 329 : their efferent trunksdo not ramify in the immediate margin of the vaso-ganglion fromwhich they issue, as in the vaso-ganglions of the Cod, Burbot,Acerine, and Perch, but run for some distance before theyagain branch to form the common capillary system of the liningmembrane of the air-bladder. Rathke1 failed to detect the opening of the air-duct with the1 cxi. Ucber die Schwimm-blase ciniger Fische, p. 98. 496 ANATOMY OF VERTEBRATES. 329. Parallel vessels of the vaso-ganglion of the air-bladder,Eel. cclxviii. oesophagus in the Eel; but De la Roche had well described theoblique aperture,1 and accurately cites the whole family of theEels as fishes having both the so-called air-gland and thepneumatic duct. It had been supposed that the vascular 6 air-gland was present only in those fishes which could not derivethe gaseous contents of their swim-bladder from without; andunquestionably in those fishes which have the shortest andwidest ducts (Sturgeon, Ami a, Erythrinus, Lepidosteus, Lepido-siren, Polypterus) the supposed air-secreting vaso-ganglions arenot developed. Since Professor Magnus has determined the existence of free carbonicacid gas, of oxygen, and ofazote in the blood, and dis-solved in different propor-tions in the venous and thearterial blood, it may bereadily conceived that thevenules of the vaso-ganglions may withdraw carbonic acid gasfrom the arterioles, and that these may reach the inner surface ofthe
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