. A junior course of practical zoology. Zoology. 134 THE CRAYFISH 1. The branchial chambers are situated one at each side of the thorax, between the body and-the branchiostegite. Expose the left branchial chamber by cutting away the branchiostegite of that side; and fix the animal on its right side under water. The chamber is bounded on its inner side by the thoracic epimera, and on its outer side by the. Fig. 26.—Astacus fluviatilis. Diagrammatic transverse section through the thorax. The dotted spaces contain arterial blood. The spaces shaded with horizontal lines contain venous blood. The a
. A junior course of practical zoology. Zoology. 134 THE CRAYFISH 1. The branchial chambers are situated one at each side of the thorax, between the body and-the branchiostegite. Expose the left branchial chamber by cutting away the branchiostegite of that side; and fix the animal on its right side under water. The chamber is bounded on its inner side by the thoracic epimera, and on its outer side by the. Fig. 26.—Astacus fluviatilis. Diagrammatic transverse section through the thorax. The dotted spaces contain arterial blood. The spaces shaded with horizontal lines contain venous blood. The arrows indicate the direction of the blood-circulation, (c. H. H.) AB, arthrobranchia : only one is figured on each side. AP, afferent vessel of gill. , arthrodial membrane. B, branchiostegite. BC, branchio-cardiac canal. EP, efferent vessel of gill. SM, extensor muscle of the abdomen. E S, endophragmal skeleton. H, heart, showing the dorsal ostia, with their valves. L, liver. M, flexor muscle of the abdomen. KT, nerve-connective. P, proctodoeum. PB, podobranchia. PL, pleurobranchia, PS, pericardial sinus. T, testis, with roots of vasa deferentia. V, sternal artery. VA, artery supplying leg. VS, ventral blood-sinus : it contains numerous large muscles moving the limbs, which are not represented in the figure. "W, one of the legs, out off 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 Marshall, A. Milnes (Arthur Milnes), 1852-1893; Hurst, C. Herbert (Charles Herbert), 1856?-1898, joint author. London, Smith, Elder
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1887
