﻿110 rCHTHTOBOETTLITBS. 



Acondylacanthus tenuistriatus, St. John & Worthen (non Davis), 

 op. cit. vol. vi. p. 433 : Cladodus tenuistriatus, H. Roma- 

 nowsky, Bull. Soc. Imp. Nat. Moscou, 1864, pt. ii. p. 167, 

 pi. iv. fig. 33. — Carboniferous Limestone : Govt, of Toula. 



Acondylacanthus tuberculatus, J. W. Davis, Trans. Roy. Dublin 

 ' Soc. [2] vol. i. (1883), p. 348, pi. xlvi. fig. 4.— Lower 

 Carboniferous Limestone : Armagh, \_0lim Enniskillen 

 Collection; see Introduction.] 



Doubtful spines are also named Acondylacanthus ? mudgianus, 

 St. John & Worthen (op. cit. vol. vii. p. 244, pi. xxiv. fig. 3), from 

 the Upper Coal-Measures of Kansas : A. nuperus, St. John & Worthen 

 (op. cit. vol. vii. p. 242, pi. xxvi. fig. 3), from the Upper Coal- 

 Measures of Illinois ; and A. ? xiphias, St. John & Worthen {pp. cit. 

 vol. vii. p. 244, pi. xxvi. fig. 1), from the Keokuk Limestone of 

 Iowa. 



Genus ASTEROPTYCHIUS, M'Coy (ex Agassiz, MS.). 

 [Ann. Mag. Nat. Hist. [2] vol. ii. 1848, p. 118.] 



Dorsal fin-spines slender, much laterally compressed, gradually 

 tapering distally ; sides of exserted portion ornamented with few 

 thread-like, longitudinal ridges, with broad striated interspaces, in 

 which are scattered smooth tubercles ; posterior face concave, each 

 margin having a series of large denticles in part directed upwards, 



Asteroptychius ornatus, M'Coy (ex Agassiz, MS.). 



1843. Asteroptychius ornatus, L. Agassiz, Poiss. Foss. vol. iii. p. 176 



(name only). 

 (?) 1843. Asteroptychius poHlockii, L. Agassiz, ibid. p. 176 (name only). 

 1848. Asteroptychius semiornatus, F. M'Coy, Ann. Mag. Nat. Hist. [2] 



vol. ii. p. 118. [Woodwardian Museum, Cambridge.] 

 1855. Asteroptychius ornatus, F. M'Coy, Brit. Palaeoz. Foss. p. 615, 



pi. iii. k. figs. 23, 24. 

 1855. Asteroptychius semiornatus, F. M'Coy, ibid. p. 616, pi. iii. k. fig. 22. 

 1883. Asteroptychius ornatus, J. W. Davis, Trans. Roy. Dublin Soc. [2] 



vol. i. p. 353, pi. xlvi. figs. 7-9. * 



Type. Woodwardian Museum, Cambridge. 



The type species. 



Form. 6f Loc. Lower Carboniferous Limestone ; Armagh, Ireland . 



P. 2541-2. Twelve imperfect specimens. Enniskillen Cull. 



