. The elasmobranch fishes . Fig. 242. The cephalic canals, Baia hatis, dorsal view. (From Ewart and Mitchell, modified.) CO., commissural or supratemporal canal; hmc, hyoman- dibular canal; ioc, infraorbital canal; 11., lateral line; mc, mandibular canal; soc, supraorbital canal; sc.'^'", first and second scapular canals; sp., spiracle.

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