Holoptychius americanus Leidy 



Page 167 



Imperfect scale. Natural size 



Chemung beds ; Jefferson, Delaware co., N. Y. 



Original in New York State Museum 



Compare with A. S. Woodward's figures of Holoptychius scales from 



the Upper Devonic of East Greenland (Bihang till K. Svenska Vet. 



Akad. Handl. 1900. 26 : 3-6, pi. 4). 



209 



