﻿472 ACTINOPTERYGII. 



bones arc observed, and the smoothness of the operculum 

 and suboperculuin is doubtless due to superficial corrosion. 



Enniskillen Coll. 



18505. Portions of head and trunk showing pectoral and pelvic 

 fins ; Thuringia. Purchased, 1844. 



28427-28. Two imperfect specimens of the head and opercular 

 apparatus ; Eisleben. Mantell Coll. 



P. 834. Portion of jaws and pectoral arch ; Riechelsdorf. 



Egerton Coll. 



P. 3414 a. Portion of coiled-up trunk, with pectoral, pelvic, and 

 dorsal fins ; Mansfeld. Enniskillen Coll. 



P. 3414 b. Middle portion of trunk with fragments of pelvic, dorsal, 

 and anal fins ; Biechelsdorf. Enniskillen Coll. 



14371. Imperfect caudal region, wanting the greater portion of the 

 anal and caudal fins ; Eisleben. The proportions of the 

 neural arches beneath the dorsal fin are distinct. 



Purchased, 1841. 



18509. Small fish, 0*16 in length from the hinder border of the 

 pectoral arch to the base of the caudal fin, probably young 

 of this species ; Eisleben. There are well-preserved re- 

 mains of all the fins except the caudal, though the posterior 

 extension of the anal is broken away ; and some of the 

 neural and haemal arches of the vertebral axis are dis- 

 tinctly seen under the thin squamation. Purchased, 1844. 



(ii.) Marl Slate. 



P. 3416. Nearly complete fish, 0*6 in length, with much crushed 

 head; Midderidge. In the abdominal region the neural 

 spines are distinctly shown, not less than thirty in number; 

 and in the anterior half of the caudal region both neural 

 and haemal arches are preserved. The fins and squama- 

 tion are also indicated, but too imperfect for detailed 

 description. Enniskillen Coll. 



P. 3416 a. Slightly smaller individual, the head and abdominal 

 region being very imperfect, but the caudal region almost 

 complete; Midderidge. Some of the cranial roof-bones 

 and the maxilla exhibit the characteristic irregular stria- 

 tions, and there are traces of the large laniary teeth. 



