. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. EASTMAN : CARBONIFEROUS SHARKS. 79 fairly regular intervals of sculptured eminences or nodes (text-Fig. 8 A), a very unusual character in this genus, and in allusion to which the spe- cific title is bestowed. As regards ornamentation, a certain resemblance will be observed to Oracanthus and the spines described by St. John and Worthen as Glymmatacanthus rudis^ and Batacanthus haculiformis. Tlie longitudinal costse of Ctenacanthus are commonly described as being ''interrupted" by transverse ridges or swel
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. EASTMAN : CARBONIFEROUS SHARKS. 79 fairly regular intervals of sculptured eminences or nodes (text-Fig. 8 A), a very unusual character in this genus, and in allusion to which the spe- cific title is bestowed. As regards ornamentation, a certain resemblance will be observed to Oracanthus and the spines described by St. John and Worthen as Glymmatacanthus rudis^ and Batacanthus haculiformis. Tlie longitudinal costse of Ctenacanthus are commonly described as being ''interrupted" by transverse ridges or swellings, implying that the latter are of subordinate importance, and that the truly essential structures are the longitudinal ridges. A study of the mode in which the ornamentation originates in the present specimen is sufficient to. r "â ^. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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