. Comparative anatomy and physiology. . Fig. 82.—Diagrams to show the arrangement of the great Blood-vessels in the fresh-water Mussel (c); aud the Fish (D). more or less at its free end; but the greater part of the blood makes its way through definite spaces without distinct enclosing walls, the so-called lacunae.* In the Malacostraca a posterior aortic artery is given off, in addition to the anterior; and in the crayfish, for example, we may further distinguish two pairs of anteriorly directed trunks ; the antennary, which * Our knowledge of the vascular system of Arthropoda, or Molluscs, is
. Comparative anatomy and physiology. . Fig. 82.—Diagrams to show the arrangement of the great Blood-vessels in the fresh-water Mussel (c); aud the Fish (D). more or less at its free end; but the greater part of the blood makes its way through definite spaces without distinct enclosing walls, the so-called lacunae.* In the Malacostraca a posterior aortic artery is given off, in addition to the anterior; and in the crayfish, for example, we may further distinguish two pairs of anteriorly directed trunks ; the antennary, which * Our knowledge of the vascular system of Arthropoda, or Molluscs, is in an unsatisfactory condition; the " lacunar con- nection between the arteries and veins, which is confidently de- scribed and discussed by all zoologists, has never yet been demon- strated to exist in a manner satisfying the requirements of modern histology " (Lankester).. 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 Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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