408 CKOSSOPTEEYGII. 
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Ccelacanthus gracilis, Agassiz. 
/ 
1844. Ccelacanthus gracilis, L. Agassiz, Pois. Foss. vol. ii. pt. ii. p. 173. 
Type. Portion of caudal region ; British Museum. 
An imperfectly 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. &f Log. 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 
Ccelacanthus :— 
P. 3346-51. Jugular plate and five other external bones, orna¬ 
mented with irregular striae, ascribed to Ccelacanthus by 
J. W. Davis, Trans. Boy. Dublin Soc. [2] vol. i. p. 524, 
pi. lxiii. figs. 7-12 ; Lower Carboniferous Limestone, 
Armagh. Enniskillen Coll. 
The undefined species, Ccelacanthus 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. Nat. Sci. Philad. 
1873, pp. 343, 418), is placed near to Ccelacanthus (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 Bep. Geol. 
Surv. Ohio, vol. ii. pt. ii. 1875, p. 410, pi. xxxv. fig. 6, pi. xli. figs. 
4, 5), and also includes Conchiopsis exanthemcdicus , 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. ardata, E. D. 
Cope (Proc. Amer. Phil. Soc. vol. xvii. 1878, p. 54). = 
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