. Biology . Fig. 72.—The abdominalmusculature of the lobster toshow the complicated arrange-ment of extensors and flexors.(From Gerstaecker, after jMilne-Edwards.) 178 HOMOLOGY. Fig. 73.—The central nervous systems of the lob-ster and the crab. The ventral chain of ganglia inthe crab are concentrated in one ventral mass, thesternal artery passing through it. (From Gerstaeckerafter Cuvier.) highly developed, the large ventral musclesof the abdomen being remarkably power-ful. These are inserted anteriorly onthe inner walls of the cephalothorax (), one on each side. In the abdomenthey twist
. Biology . Fig. 72.—The abdominalmusculature of the lobster toshow the complicated arrange-ment of extensors and flexors.(From Gerstaecker, after jMilne-Edwards.) 178 HOMOLOGY. Fig. 73.—The central nervous systems of the lob-ster and the crab. The ventral chain of ganglia inthe crab are concentrated in one ventral mass, thesternal artery passing through it. (From Gerstaeckerafter Cuvier.) highly developed, the large ventral musclesof the abdomen being remarkably power-ful. These are inserted anteriorly onthe inner walls of the cephalothorax (), one on each side. In the abdomenthey twist around one another like ahuge muscular rope, and are intimatelyconnected with the ventral exo-skeletalparts of each somite. Contraction of themuscles results in the simultaneous ven-tral turning of all the abdominal somites,and the vigorous flop of the lobsterresults. Similar, but smaller and straightmuscles lie on the dorsal surface of thehuge ventral muscles, and are similarlyconnected with the dorsal these muscles contract, the abdomi-
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectbiology
