. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. RESPIRATOnY CIRCULATION IN FISHES. 195 the requisite power is supplied by two additional hearts, situated on the venae cavae, of which they appear as if they were dilatations, immediately before the branchial arteries are sent ;^ They are shown at e, e, Fig. 355, which re-. presents this part of the vascular system of the Loligo, de- tached from the surrounding parts; the course of the blood being indicated by arrows, c is one of the three trunks c
. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. RESPIRATOnY CIRCULATION IN FISHES. 195 the requisite power is supplied by two additional hearts, situated on the venae cavae, of which they appear as if they were dilatations, immediately before the branchial arteries are sent ;^ They are shown at e, e, Fig. 355, which re-. presents this part of the vascular system of the Loligo, de- tached from the surrounding parts; the course of the blood being indicated by arrows, c is one of the three trunks constituting the venae cavae, proceeding from above, dividing into two branches as it descends, and terminating, conjointly with the two venous trunks (d,) which are cominir from be- low, into the lateral or branchial hearts (e, e,) already men- tioned. Thence the blood is conveyed by the branchial arteries, (f, f,) on each side, to the gills (g,) and returned, by the branchial veins (i,) to the large central, or systemic heart (l,) which again distributes it, by means of the sys- temic arteries, to every part of the body. The cuttle-fish tribe is the only one thus furnished with three distinct hearts for carrying on a double circulation: none of these hearts are furnished with auricles. The remarkable distribution of the muscular powers which give an impulse to the circulating fluids, met with in * These veins arc surrounded by a great number of blintl pouches, wliich have the appearance of a fringe; the use of this singular structure is un- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. Philadelphia, Carey, Lea & Blanchard
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