﻿124 h n rHTODORULITES. 



( 1 8 78), p. 3, pi. i. fig. 19: (^)Ichthy odontites, F. A. Roemer, 

 Palaontogr. vol. iii. (1852), p. 75, pi. xi. fig. 26. — Lower 

 Devonian ; Harz Mts. 



Machasracanihus archiaci : Machcerius archiaci, M. Rouanlt, 

 Comptes Rendus, vol. xlvii. (1858), p. 103. — Lower De- 

 vonian; Brittany. 



MaeJuvmcanthus bohemicus, 0. Novak, Sitzungsb. k. bbhm. Gesell. 

 Wiss. 1886 (1887), p. 663, pi. i. fig. 14: Ctenacanthus 

 bohemicus, J. Barrande, Syst. Silur. Boheme, Suppl. to 

 vol. i. (1872), p. 641, pis. xxviii., xxx., xxxiv. : Machcera- 

 canthus, E. Kayser, Neues Jahrb. 1884, vol. ii. p. 82. — 

 Lower Devonian ; Bohemia. [Royal Bohemian Museum, 

 Prague.] 



Machceracanthus larteti: Machcerius larteti, M. Rouault, torn. cit. 

 (1858), p. 102. — Lower Devonian ; Brittany. [Type 

 species of Machcerius. ,] 



Machceracanthus major, J. S. Newberry, Bull. Nat. Inst. (1857), 

 p. 6, and Rep. Geol. Surv. Ohio, vol. i. pt. ii. (1873), 

 p. 304, pi. xxv. fig. 2, and Palseoz. Fishes N. America 

 (1889), p. 39, pi. xxix. fig. 4. — Lower Devonian (Corni- 

 ferous Limestone) ; Ohio. [Columbia College, New York.] 



Machceracanthus peracutus, J. S. Newberry, torn. cit. (1857), p. 6, 

 and torn. cit. (1873), pp. 303, 305, pi. xxix. fig. 6, and 

 woodc, and torn. cit. (1889), pp. 38, 40, pi. xxix. fig. 6, 

 and woodc. — Corniferous Limestone ; Ohio. [The type 

 species. Columbia College, New York.] 



Genus HAPLACANTHUS, Agassiz. 

 [Poiss. Foss. V. G. R. 1845, p. 114.] 



Spines of small size, elongated, tapering, more or less curved and 

 laterally compressed, apparently without posterior denticles ; a deep 

 longitudinal groove separating a yarrow anterior rim from the rest 

 of the spine, which has smooth sides or exhibits faint longitudinal 

 striae. 



As remarked by von Eichwald, spines of this form may be com- 

 pared with those of Cheiracanthus and allied Acanthodian genera. 



Haplacanthus marginalis, Agassiz. 



1845. Haplacanthus marginalis, L. Agassiz, Poiss. Foss. V. G. R. p. 114, 

 pi. xxxiii. figs. 4-6. 



1846. Onchus tenuisulcatus, E. von Eichwald, Bull. Soc. Imp. Nat. 

 Moscou, vol. xix. pt. ii. p. 292, pi. x. figs. 6, 7. 



