CESTRACIONTIDiE. 
267 
P. 2208. Portions of left pterygo-quadrate, mandibular, hyoman- 
dibular, and ceratohyal cartilages, with a few imperfect 
teeth, and fragments of three U Sphenonchi” and one 
dorsal spine. Egerton Coll. 
P. 3162. A few scattered teeth, associated with fragments of carti¬ 
lage and shagreen. Enniskillen Coll. 
P. 5876. Fragments of skull, jaws, and branchial arches, associated 
with teeth and the two dorsal fin-spines. Some caudal 
vertebrae of a small Ichthyosaurus are mingled with the 
remains. Enniskillen Coll. 
P. 3156. Remains of a crushed head, with traces of teeth, two 
“ Sphenonchi,” and the first dorsal spine. Enniskillen Coll. 
P. 423. Remains of the head, about five teeth, the first dorsal fin- 
spine, and shagreen. 
Presented by E. Seymour Ha den, Esq., 1882. 
The dorsal fin-spines of this species are not readily distinguishable 
from those of Acroclus anningice. The anterior dorsal is long and 
slender, with the lateral ribs more or less acute and evenly spaced, 
and the denticles of moderate size, placed upon a longitudinal 
elevation of the posterior face. The following specimens are provi¬ 
sionally placed here :— 
P. 3170. Anterior and posterior dorsal fin-spines, associated with 
fragments of cartilage. The superficial ganoine layer of 
the spines is almost destroyed. Enniskillen Coll. 
P. 5865. Associated anterior and posterior spines, the exserted 
portion of the first measuring 0’22 in length, that of the 
second O’185. History unknoivn. 
42297. Much abraded and broken spine. Purchased, 1870. 
P. 2166 h. Broken anterior spine, labelled by Agassiz Hybodus in- 
curvus. Egerton Coll. 
P. 2162. Slender spine, with comparatively flat posterior face, the 
exserted portion measuring 0'37. Egerton Coll. 
P. 2826. Anterior spine, wanting posterior denticles and most of 
the inserted portion ; the exserted portion measures 0*295, 
and the lateral ridges are not crowded behind in the 
proximal half. Enniskillen Coll. 
