DEVONIC FISHES OF THE NEW YORK FORMATIONS ']'] 



Ctenacanthus randalli Newberry 



1889 Ctenacanthus randalli /. S. Neivberry. U. S. Geol. Sur, Monogr. 

 16: J05 



This species, which has never been illustrated, is founded upon the 

 proximal portion of an extremely large spine, estimated to have been at 

 least 30 cm in length. The original description is as follows : 



Dorsal fin spines 12 inches or more in length by i^^ inches in width at 

 base of ornamented portion ; form slightly curved backward, sides com- 

 pressed, basal portion conical, smooth, or finely striated longitudinally ; line 

 of demarcation between ornamented surface and base strongly marked, 

 inclined downward and forward at an angle of 30° with the axis of the spine ; 

 ornamented surface near base formed by about 40 fine, parallel, subequal, 

 closely crowded ridges on each side of the median line, and these bear small, 

 rounded, closely approximated tubercles. 



Formation and locality. Olean conglomerate (Chemung group); near 

 Warren, Pa. 



Ctenacanthus chemungensis Claypole 



Plate 7, figure 3 



1885 Ctenacanthus chemungensis E. J!'. Claypole. Am. Ass'n Adv. Sci. 

 33d meeting, Phila. Proc. 1884. p. 490 (name only) 



This name was applied by Professor Claypole without definition or 

 illustration to small fin spines obtained by him from the Chemung of Brad- 

 ford county, Pennsylvania, whose length was stated to be "less than half 

 that of C t. vetustus." 



To this species may probably be referred a number of small, gently 

 arcuate, finely ornamented spines which were collected by the late Professor 

 Charles E. Beecher and others from the Chemung of Warren county, Penn- 

 sylvania, examples of which are preserved in the New Haven and Cam- 

 bridge Museums. Spines of similar nature have also been obtained from 

 two or three localities in New York. One in the State Museum at Albany 

 bearing the locality label 1783 is from the Chemung between Friendship 

 and Nile, N. Y., and displays the delicate ornamentation very clearly. 

 Another, belonging to the Museum of Comparative Zoology at Cambridge, 

 is from the same horizon along the bank of Fall creek, near Ithaca, N. Y., 

 and was collected many years ago by Dr Richard Rathbun. 



