The laws and mechanics of circulation, with the principle involved in animal movement . tion of the pulmonary from the systemic auricle,first observed in Siren, has been since determined in Meno-branchus, f Axolotes, J AmpMuma, § and Menopoma. In Pro-teus, in which some of the blood of the puny lungs is conveyedto systemic veins, the auricular septum is not complete, accord-ing to Hurd. 1 In Ampliiuma, the auricle is smaller and less *Ibid., pp. 506-507. f Meyer. Analekten fur Vergleichende Anatomie, 4to, p. 73. 1835. % Calori. Sull Anatomia dell Axolotis Commentario, 4to, p. 45. §Ibid., p. 21
The laws and mechanics of circulation, with the principle involved in animal movement . tion of the pulmonary from the systemic auricle,first observed in Siren, has been since determined in Meno-branchus, f Axolotes, J AmpMuma, § and Menopoma. In Pro-teus, in which some of the blood of the puny lungs is conveyedto systemic veins, the auricular septum is not complete, accord-ing to Hurd. 1 In Ampliiuma, the auricle is smaller and less *Ibid., pp. 506-507. f Meyer. Analekten fur Vergleichende Anatomie, 4to, p. 73. 1835. % Calori. Sull Anatomia dell Axolotis Commentario, 4to, p. 45. §Ibid., p. 215. J] John Hunter. On the Blood and Inflammation. 4to, p. 258. 1794. 412 DIFFKRENIIATION OF LEFT AURICLE. fimbriated than in Siren. The ventricle is similarly connectedto the pericardium by the apex, as well as by the artery. Thisformsahalf-spiial turn at its origin, and dilates into a broaderand shorter bulb than in siren. In Menopoma, they are stillmore reduced in size, and lie. as in Salamandra* (Pig- 171, a),when nndistended, to the lef r of the ventricle; their outer surface,. Fig. 169.—Respiratory and Circulatory Organs in Prbteiis Mexicanus (Axolotl).—Cyclo-paedia of Anatomy, Art. Respiration (Supplement). Allen Thomson. A, truncusarteriosus; B, the three upper pairs of branchial arteries; P, P, the lower pairproceeding to the lungs or pulmonic arteries ; b, branchial veins ; v, pulmonary veins ;V, vena cava ; I, hepatic vein ; H, ventricle of the heart, surmounted by the largeright auricle. as in Menobranchus, is entire. The ventricle is of a flattened,triangular form ; its cavity is occupied by the loose, fasciculatemuscular structure, through which the blood filters, as througha sponge, from the small contiguous auricular apertures, eachof which has a simple valve, to the ostium arteriosum. * Owen, Fig. 333. DIFFERENTIATION- OF LEFT AURICLE. 413 The artery inclines, with a slight twist, to the left, and swellsinto a spherical bulb. The valves are confined to the
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