. The elasmobranch fishes. Chondrichthyes. 278 THE ELASMOBRANCH FISHES In addition to what we have said of this system in a typical ray, it may be added that in a sluggish type like Torpedo certain of the cephalic canals may be lacking ventrally while in an active form like Dicerohates {Cephalopoda) tubules may branch off of the canal, unlike the simple tubules of Baja clavata, and form a complex net (fig. 243). The internal structure of the canals may be studied in a transverse section through the lateral sensory canal of the leopard shark, Triakis semifasciatus (see p. 26, fig. 29, ). In
. The elasmobranch fishes. Chondrichthyes. 278 THE ELASMOBRANCH FISHES In addition to what we have said of this system in a typical ray, it may be added that in a sluggish type like Torpedo certain of the cephalic canals may be lacking ventrally while in an active form like Dicerohates {Cephalopoda) tubules may branch off of the canal, unlike the simple tubules of Baja clavata, and form a complex net (fig. 243). The internal structure of the canals may be studied in a transverse section through the lateral sensory canal of the leopard shark, Triakis semifasciatus (see p. 26, fig. 29, ). In such a figure it will be seen that the walls of the canal are unequal in thickness. Both in the lateral line and the dorsal cephalic. 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 Daniel, J. Frank (John Franklin), 1873-1942. Berkeley,Calif. , University of California press
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