. Biology. Biology. FIG. 73.—The central nervous systems of the lob- ster and the crab. The ventral chain of ganglia in the crab are concentrated in one ventral mass, the sternal artery passing through it. (From Gerstaecker after Cuvier.) highly developed, the large ventral muscles of the abdomen being remarkably power- ful. These are inserted anteriorly on the inner walls of the cephalothorax (Fig. 72), one on each side. In the abdomen they twist around one another like a huge muscular rope, and are intimately connected with the ventral exo-skeletal parts of each somite. Contraction of the mu
. Biology. Biology. FIG. 73.—The central nervous systems of the lob- ster and the crab. The ventral chain of ganglia in the crab are concentrated in one ventral mass, the sternal artery passing through it. (From Gerstaecker after Cuvier.) highly developed, the large ventral muscles of the abdomen being remarkably power- ful. These are inserted anteriorly on the inner walls of the cephalothorax (Fig. 72), one on each side. In the abdomen they twist around one another like a huge muscular rope, and are intimately connected with the ventral exo-skeletal parts of each somite. Contraction of the muscles results in the simultaneous ven- tral turning of all the abdominal somites, and the vigorous flop of the lobster results. Similar, but smaller and straight muscles lie on the dorsal surface of the huge ventral muscles, and are similarly connected with the dorsal exo-skeleton. When these muscles contract, the abdomi-. 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 Calkins, Gary N. (Gary Nathan), b. 1869. New York, H. Holt and company
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