380 ' 
CROSSOPTERYGII. 
long as deep; teeth with fine superficial vertical striae ; operculum 
nearly as broad as deep; each of the pair of jugular plates about 
two and a half times as long as broad, abruptly truncated poste¬ 
riorly. Ring-vertebrae relatively broad. Ganoine smooth and 
uniformly punctate. 
This is also the type species of the so-called Centrodus , Para- 
batrachus, and Ganolodus. 
Form. 6f Log. Coal-Measures: all Coal-fields of England, Wales, 
and Scotland (? and Ireland), r^x^ 
P. 6284. Eish 0*93 in length, wanting the extremity of the tail ; 
Coalbrookdale. The specimen shows the ventral aspect, 
and of fins exhibits only portions of the pectorals, which 
are distinctly obtusely lobate. Purchased . 
P.5231. Head and scales of anterior portion of trunk; Dudley. 
The cranial roof-bones, though broken, are well shown, 
and portions of the mandibular rami and opercular 
apparatus are distinct. Purchased , 1886. 
P. 5232. Similar specimen, of larger size; Dudley. 
Purchased , 1886. 
P. 806. Remains of a small head ; locality unknown. 
Egerton Coll. 
P. 805. Parietal bones and the squamosal and postfrontal elements 
of the right side, most of the superficial ganoine-layer 
removed ; locality unknown. Egerton Coll . 
21421. Pronto-ethmoidal region of skull, somewhat crushed and 
obscured by matrix ; Carluke. Purchased , 1847. 
P. 3306. Similar specimen ; Carluke. Enniskillen Coll. 
P.3307. Similar specimen; Longton, Staffordshire. 
Enniskillen Coll. 
39164. Fragment of premaxilla and dentary ; Coalbrookdale. 
Bowerhank Coll. 
P. 3312. Left maxilla, with portions of other bones and scales, 
wanting most of the superficial ganoine ; Dalkeith. 
Enniskillen Coll. 
P. 3313. Fragmentary maxilla, associated with scales; Dalkeith. 
Enniskillen Coll. 
