. The elasmobranch fishes. Chondrichthyes. THE ELASMOBRANCII FISHES 79 than those of the propterygium. In the rays these are of unusual interest. In addition to those extending from the mesopterygial cartilage there are certain other radials posterior to this cartilage, as we have said, which extend to the girdle. Five such occur in Raja clavata, two or three in Squatina, a shark, and a larger number in some other forms. The most interesting thing about these extraradials is that in some of the rays they produce, as Howes (1890) has shown, a fourth basal, the neopterygium {, fig. 83), ind
. The elasmobranch fishes. Chondrichthyes. THE ELASMOBRANCII FISHES 79 than those of the propterygium. In the rays these are of unusual interest. In addition to those extending from the mesopterygial cartilage there are certain other radials posterior to this cartilage, as we have said, which extend to the girdle. Five such occur in Raja clavata, two or three in Squatina, a shark, and a larger number in some other forms. The most interesting thing about these extraradials is that in some of the rays they produce, as Howes (1890) has shown, a fourth basal, the neopterygium {, fig. 83), indicated in Rhmo- batis and well formed in Pteroplatea. In the rays the metapterygial radials are similar to those of the propteryg-. 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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