472 
ACTIXOPTEKYGII. 
bones are observed, and the smoothness of the operculum 
and suboperculum 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-np 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; Riechelsdorf. 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. 
