. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. BUTFALO SOCIETY OF NATURAL SCIENCES 159 and the outer face striated. Height of largest of the three teeth preserved in type specimen greater than width of element in region of this tooth. Teeth well separated but distance between adjacent teeth less than width of one of the teeth. Spine ornamented with a few longitudinal striations (mostly worn off in the type specimen). Remarks.—This species is distinguishable at a glance from Apatea- canthus vetustus (Clarke), by the fact that the teeth are vertical instead of i
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. BUTFALO SOCIETY OF NATURAL SCIENCES 159 and the outer face striated. Height of largest of the three teeth preserved in type specimen greater than width of element in region of this tooth. Teeth well separated but distance between adjacent teeth less than width of one of the teeth. Spine ornamented with a few longitudinal striations (mostly worn off in the type specimen). Remarks.—This species is distinguishable at a glance from Apatea- canthus vetustus (Clarke), by the fact that the teeth are vertical instead of inclined. From A. peculiaris (Hussakof) the present species dififers in the teeth being narrower in proportion to their height, and in being strongly striated. It is possible, however, that in the latter. /\/\Az^^ Fig. 54. Ay Atopacanthus dentatus, n. gen., n. spec. Type,Natural Size. E 2496. B, Atopacanthus peculiaris (Hussakof.) For Comparison; Reversed Right to Left. species, perfect specimens showing the external surface of the teeth, not merely their impression, would also show the teeth to have been striated. Ctenacanthus nodocostatus, n. sp. (PI. 51, fig- i) E 2083 Type.—Impression in sandstone of a complete spine, 17 cm. in length. Formation and Locality.—Yellow sandstone above ' 'Second Moun- tain Sandstone" (CatskiU); 4 miles South of Pleasantville, Venango County, Pa. Collected by J. F. Carll. Spine of medium size, gently arcuate, with a large inserted portion, occupying about \ the entire length of the spine. Lateral faces orna-. 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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