The elasmobranch fishes (1934) The elasmobranch fishes . elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 125 Fig. 123. Valvular intestine, with middle segment omitted, Heptanchus maculatus. (Dun- can Dunning, del.) pv., pyloric valve.

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