BUFFALO SOCIETY OF NATURAL SCIENCES 161 



Ctenacanthus wrighti Newberry 

 (PL 52, fig. 2) 



This species has hitherto been known only by the type specimen,^^ a 

 large, well-preserved spine from the Hamilton (Mid. Devonic) of 

 Yates County, N. Y. (No. 352 Newb. Coll., Amer. Mus.) 



Several fragments of spines in the Buffalo Museum seem from their 

 ornamentation to belong to this species. They are from the Conodont 

 bed at Eighteen Mile Creek, N. Y., and were collected by W. L. 

 Bryant. They thus extend the range of this species into the Genesee. 



E 1904 Two fragments of spines with the ornamentation well pre- 

 served (PL 52, fig. 2). One of them agrees quite closely 

 with the orriamentation of the type specimen. 



E 2497 Fragment of a spine on a thin slab of rock together with 

 numerous small fragments of Arthrodire plates, and 

 several teeth. 



Ctenacanthus sp. 



E 2498 Fragment of a spine ornamented with rows of beads, each 

 an elevated, transversely elongated tubercle with the 

 upper margin smooth, somewhat beveled, the lower mar- 

 gin with strong pectinations; the whole bead resembling 

 the form of a Pecten shell. This fragment probably 

 represents a new species, but we do not wish to name it 

 until a more or less complete spine, or at any rate a por- 

 tion of a spine showing the size, form and nimiber of 

 ornamented ridges, is found. 



Conodont bed (Genesee); Eighteen Mile Creek, near 

 N. Evans, Erie County, N. Y. Collected by W. L. 

 Bryant. 



Cyrtacanthus dentatus? Newberry 



(Text-fig. 55) 



This species was based by Newberry on a spine of the kind now 

 regarded as head spines, from their resemblance to the frontal claspers 



'<iV. Y. State Mus., ssth Rep., 1884, p. 206, pi. xvi, figs. 12-14; Paleoz. Fishes, N. A., p. 66, pi. 

 xxvi, figs. 4, 4a, 4b. 



