. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Lobster. within these sacs, as upon the gills or lungs of other animals, but the exact course of the blood does not appear as yet to have been satisfacto- rily ascertained in these animals. Audouin* believes it to be essentially the same as in the Crustacea. The long-shaped dorsal vessel or heart gives off arteries to both sides, and re- ceives at one place branches from the gills. The veins form only spaces or sinuses, and not vessels on the abdominal side of the animal. The blood propelled from the artery is passed thr
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Lobster. within these sacs, as upon the gills or lungs of other animals, but the exact course of the blood does not appear as yet to have been satisfacto- rily ascertained in these animals. Audouin* believes it to be essentially the same as in the Crustacea. The long-shaped dorsal vessel or heart gives off arteries to both sides, and re- ceives at one place branches from the gills. The veins form only spaces or sinuses, and not vessels on the abdominal side of the animal. The blood propelled from the artery is passed through the system, returning from which, it is collected into the venous sinuses below, thence it proceeds to the pulmonary organs, and after passing through them, returns to the heart. Zoophytes. — The general character of the circulation in this class is exceedingly ob- scure ; for while in some of the animals be- longing to it, comparative anatomists have not succeeded as yet in pointing out any distinct vascular system; in others, they have been at a loss to determine, among various vascular or- gans, which of them forms the proper circula- tory system corresponding with that of higher animals. Echinodermata.—Among the Zoophytes the Echinodermata present the most fully deve- loped vascular system with which we are ac- quainted. According to the observations of Tiedemann and Delle Chiaje, who have inves- tigated the structure of these animals with great success, there are two principal divisions of the vascular system, described by the first of the above-mentioned authors as distinct from one another, by the other as communicating toge- ther. We do not feel inclined to consider, in ac- cordance with the view of these authors, that series of cavities which is employed in loco- motion as a part of the nutritive circulatory organs. That part of the vascular system of these animals again, which is situated in the neigh- bourhood of the alimentary canal, very proba- bly corres
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