The laws and mechanics of circulation, with the principle involved in animal movement . no-branchus and Siren, the septum of the auricles is less com-plete than in the other Amphibia. The left auricle is muchsmaller than the right, and a single pulmonary vein opens intoit. The interior of the ventricle is more like a sponge than a * Anatomy of Vertebrate Animals. By Thomas H. Huxley, , F. R. S.,author of Lay Sermons, Mans Place in Nature, Origin of Species,etc., etc. IN PERENKTliRANi HIATES. 415 chamber with well-defined parietes. The walls of the longbulbus arteriosus contain striated mu
The laws and mechanics of circulation, with the principle involved in animal movement . no-branchus and Siren, the septum of the auricles is less com-plete than in the other Amphibia. The left auricle is muchsmaller than the right, and a single pulmonary vein opens intoit. The interior of the ventricle is more like a sponge than a * Anatomy of Vertebrate Animals. By Thomas H. Huxley, , F. R. S.,author of Lay Sermons, Mans Place in Nature, Origin of Species,etc., etc. IN PERENKTliRANi HIATES. 415 chamber with well-defined parietes. The walls of the longbulbus arteriosus contain striated muscular fibres, and arerhythmically contractile. Yalves are sometimes placed ateach end of it, and it may be imperfectly divided into twocavities by an incomplete longitudinal partition. 11 terminates,upon each side, in either three or four trunks, which ascendupon the branchial arches. The most anterior of these trunksgive off the carotid arteries, the most posterior the pulmonaryarteries, and arteries to the integument; the middle trunksform the principal roots of the dorsal Pig. 171.—Vascular System and Hyo-Branchial Apparatus, Salamander. In Proteus, where there are three branchial arches, the buibof the aorta splits into two trunks; each of these divides atfirst into two branches, and then the posterior branch, on eachside, again subdivides into two others. Thus, three pairs ofaortic trunks are formed, which ascend upon the branchialarches. The two anterior pairs of aortic trunks pass directlyinto the roots of the dorsal aorta, but each gives off a vesselwhich enters one of the external gills, the blood from which isbrought by an efferent canal into a higher part of the sameaortic arch. The third aortic trunk, on each side, is inter-rupted, its lower part becoming the branchial artery of a gill-tuft. The blood is carried out of this branchia by a venoustrunk, which opens into the root of the dorsal aorta, and is, inTeality, merely the upper part of the third aorti
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