HOLOPTYCHIIDiE. 
329 
26120 a. Portion of trunk of a somewhat smaller fish, displaying 
the scales of the ventral aspect; Dura Den. Four of 
these scales are shown, of the natural size, in PI. XI. 
figs. 1 a-d, the first two being taken from the abdominal 
region, the third and fourth from the caudal region. The 
two latter, it will be observed, are more delicate than the 
former, and exhibit the anterior radiating rows of tubercles 
usually regarded as characteristic of ‘ Glyptolepis .’ 
Purchased., 1851. 
26120 b. Slab with remains of about nine individuals, smaller than 
the foregoing; Dura Den. The fins are almost entirely 
wanting, and there are only fragments of the head and 
branchiostegal apparatus; but the scales are well pre¬ 
served and sometimes, in the anterior abdominal region, 
exhibit the partial subdivision of the superficial ridges. 
Purchased , 1851. 
26120 C. Group of typical scales and fragments; Dura Den. 
Purchased, 1851. 
P, 2077-a. Imperfect fish showing portions of head and trunk, and 
a small slab with remains of about four individuals; 
Dura Den. Egerton Coll. 
P. 3277-8. Two small slabs with imperfect remains of individuals 
showing the ventral aspect, associated with fragments of 
Phaneropleuron ; Dura Den. The first specimen exhibits 
the pair of jugular plates, well preserved but accompanied 
by no anterior median plate. Enniskillen Coll. 
P. 3280-1. Two slabs, the first with remains of three individuals of 
moderate size, the second exhibiting portions of several 
small fishes with fragments of fins ; Dura Den. 
Enniskillen Coll. 
P. 3282. Imperfect fish of moderate size, exhibiting portions of the 
head, left pectoral fin, and the ventral scales; Dura Den. 
Enniskillen Coll . 
26119. Type specimen of Holopty chius cindersoni, Agassiz, doubtless 
to be regarded as a young individual of H. Jlemingi ; 
Dura Den. The fossil is completely detached from the 
matrix and much crushed from above downwards. The 
dorsal aspect, figured by Agassiz, exhibits several of the 
bones of the head arranged as in No. 26117 b ; but most 
of the sutures are omitted in Dinkel s drawing. The 
