﻿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. Ganoino smooth and 

 uniformly punctate. 



This is also the type species of the so-called Centrodus, Para- 

 batrachus, and Ganolodus. 



Form,. <$f Log. Coal-Measures : all Coal-fields of England, Wales, 

 and Scotland (? and Ireland). 



P. 6284. Fish 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. 800. 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. Fronto- ethmoidal region of skull, somewhat crushed and 

 obscured by matrix ; Carluke. Purchased, 1847. 



P. 3306. Similar specimen ; Carluke. EnnisMllen Coll. 



P. 3307. Similar specimen : Longton, Staffordshire. 



EnnisMllen Coll. 



39164. Fragment of premaxilla and dentary ; Coalbrookdale. 



Bowerbank Coll. 



P. 3312. Left maxilla, with portions of other bones and scales, 

 wanting most of the superficial ganoine ; Dalkeith. 



EnnisMllen Coll. 



P. 3313. Fragmentary maxilla, associated with scales ; Dalkeith. 



Enniskillen Coll. 



