﻿403 CROSSOPTERYGII. 



Coelacanthus gracilis, Agassiz. 

 1844. Coelacanthus gracilis, L. Agassiz, Pois. Foss. vol. ii. pt. ii. p. 173. 



Type. Portion of caudal region ; British Museum. 



An imperfecta definable species, known only by the type spe- 

 cimen mentioned below. Body apparently elongated and slender ; 

 principal caudal fin comprising about 14 widely-spaced rays above 

 and below ; scales in part coarsely striated, in part tuberculated. 



Form. Sf Loc. Unknown (? Muschelkalk, Germany). 



P. 3341. Type specimen, 0*11 in length, comprising the principal 

 caudal fin and a portion of the caudal region in advance of 

 this. The body is very narrow, and the caudal fin-rays 

 are relatively long, showing wide articulations distally. 

 Several portions of scales occur, and there are apparently 

 traces of fossilized muscle. Enniskillen Coll, 



The following specimens are also probably referable to a species of 

 Coelacanthus : — 



P. 3346-51. Jugular plate and five other external bones, orna- 

 mented with irregular striae, ascribed to Coelacanthus by 

 J". W. Davis, Trans. Eoy. Dublin Soc. [2] vol. i. p. 524, 

 pi. lxiii. figs. 7-12 ; Lower Carboniferous Limestone, 

 Armagh. EnnisJcillen Coll. 



The undefined species, Coelacanthus minor, Agassiz (Poiss. Foss. 

 vol. ii. pt. ii. 1844, p. 173), from the Muschelkalk of Luneville, may 

 pertain either to this genus or to Heptanema. 



The genus Peplorhina, E. D. Cope (Proc. Acad. JS"at. Sci. Philad. 

 1873, pp. 343, 418), is placed near to Coelacanthus (Conchiopsis) by 

 its founder, but regarded as Amphibian by J. S. Newberry (ibid. 

 p. 426). The type species, from the Coal-Measures of Linton, Ohio, 

 is named P. anthracina, E. D. Cope (ibid. p. 343, and Rep. Geol. 

 Surv. Ohio, vol. ii. pt. ii. 1875, p. 410, pi. xxxv. fig. 6, pi. xli. figs. 

 4, 5), and also includes Conchiopsis exanthematicus, E. D. Cope 

 (Proc. Acad. Nat. Sci. Philad. 1873, p. 342). The type specimens 

 are in the Museum of Columbia College, New York. A diamond- 

 shaped dentigerous plate, from the Permian of East Illinois, has 

 also been assigned to the genus under the name of P. arctata, E. D. 

 Cope (Proc. Amer. Phil. Soc. vol. xvii. 1878, p. 54). 



