406 
CROSSOPTERYGII. 
P. 6101. Group of scales and fragments of head-bones ; Instow. 
Purchased , 1886. 
Ccelacanthus robustus, Newberry. 
1856. Ccelacanthus robustus , J. S. Newberry, Proc. Acad. Nat. Sci. 
Philad. vol. will. p. 98. 
1873. Ccelacanthus robustus , J. S. Newberry, Rep. Geol. Surv. Ohio, 
vol. i. pt. ii. p. 341, pi. xl. fig. 2. 
1888. Rhabdoderma robustum , 0. M. Reis, Pakeontogr. vol. xxxv. p. 5. 
Type. Imperfect fishes ; Columbia College, New York. 
A species of moderate size, not very satisfactorily distinguished 
from C. elegans. Jugular plates rapidly tapering and acuminate in 
front, three and a half times as long as broad ; operculum some¬ 
what less than one and a half times as deep as broad ; both orna¬ 
mented with fine, concentric, and vermiculating striae. Cranial 
roof-bones tuberculated. Scales as in C. elegans. 
Form. Loc. Coal-Measures: Ohio. 
P. 747. Two examples of the operculum and remains of a head 
showing portions of the jugular plates, labelled by Dr. 
Newberry ; Linton, Ohio. Egerton Coll. 
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Ccelacanthus elongatus, Huxley. 
1866. Ccelacanthus elongatus , T. II. Huxley, Figs. & Descrips. Brit. 
Organic Remains (Mem. Geol. Surv.), dec. xii. p. 23, pi. v. figs. 6, 7. 
Type. Imperfect fishes : Geological Survey of Ireland. 
An imperfectly known species, with well-developed fins; ap¬ 
parently distinguished from other species hitherto described in the 
narrow elongated form of the head and trunk. 
Form. Loc. Coal-Measures ; Ballyhedy near Ballinhassig, Co. 
Cork. 
Not represented in the Collection. . 
According to J. S. Newberry (Rep. Geol. Surv. Ohio, vol. i. pt. ii. 
1873, p. 340), C. elongatus is probably represented in America by 
a species from the Coal-Measures of Linton, Ohio, named C. ornatus, 
J. S. Newberry, Proc. Acad. Nat. Sci. Philad. vol. viii. (1856), p. 98, 
and Palaeoz. Fishes N. America (Mon. U. S. Geol. Surv. no. xvi. 
1889), p. 227. By 0. M. Reis (Pakeontogr. vol. xxxv. 1888, p. 5) 
the former is retained in the genus Ccelacanthus , while the latter is 
removed to the so-called Rhabdoderma. 
