. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. BUFFALO SOCIETY OF NATURAL SCIENCES 99 the Ptyctodont tritors which are almost always found in the same rocks. This opinion, even if substantiated by the finding of Acan- thaspis plates and Ptyctodont tritors in association, would not in our view militate against referring Acanthaspis to the Arthrodira, but be another link in the chain of evidence tending to prove that the Ptyctodonts are themselves Arthrodires, though with a specialized dentition. In the Buffalo Museum there are two specimens of Acanthaspis that
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. BUFFALO SOCIETY OF NATURAL SCIENCES 99 the Ptyctodont tritors which are almost always found in the same rocks. This opinion, even if substantiated by the finding of Acan- thaspis plates and Ptyctodont tritors in association, would not in our view militate against referring Acanthaspis to the Arthrodira, but be another link in the chain of evidence tending to prove that the Ptyctodonts are themselves Arthrodires, though with a specialized dentition. In the Buffalo Museum there are two specimens of Acanthaspis that add somewhat to our knowledge of this form. One consists of two ventral plates, the right and left of one individual, on a block of lime- stone. Another is a plate with an attached spine in which the cross-. FiG. 34. Acanthaspis armata Newberry. Restored Outline of Specimen Shown in Figitre 33 section of the spine is clearly shown. This is elliptical, and proves that the spine was not as compressed as might be thought from its attach- ment to so thin a plate. Acanthaspis armata Newberry E 1857 Block of limestone bearing right and left antero-ventro- laterals with their attached spines. (Text-figs. 2>3> 34-) There is also a fragmentary indeterminable plate on the same block. The specimens are shown in inner view; the suture between each plate and its attached spine cannot be made out. In one spot an impression shows the ornamentation of the outer face; this consists of the characteristic ornamentation of this 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 Buffalo Society of Natural Sciences. Buffalo, N. Y. : Buffalo Society of Natural Sciences
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