306 
ACTINOPTERYGII. 
P. 2020. Posterior abdominal and caudal region of an equally large 
individual, the scales somewhat scattered dorsally and 
ventrally, and the fins imperfect. Egerton Coll. 
P. 7564. Crushed specimen as large as the type, with scattered head- 
bones. Several of the elements are displayed, notably the 
hyomandibular and symplectic of both sides. The hyo- 
mandibular is relatively broad, expanded below, and not 
much constricted mesially; the symplectic is elongated, 
triangular in form, the apex being inferior and much 
thickened. History unknown. 
P. 3579. A slightly smaller specimen, also with displaced head- 
bones and exhibiting some of the incomplete anterior 
vertebral rings. The base of the skull is imperfectly 
shown, and the left quadrato-pterygopalatine arch is 
exposed from the inner side. On the parasphenoid and 
the oral face of the pterygoids, as also on the hinder part 
of the splenial, the dentition is reduced to a fine granu¬ 
lation ; but at the antero-inferior border of the ectoptery- 
goid, either on that bone itself or on the palatine, the teeth 
are of moderate size and arranged in a dense cluster. 
Enniskillen Coll. 
P. 6395. Hinder portion of head and greater part of the squamation 
of a fish as large as the type, in indurated Lias. The 
postorbital and opercular bones are shown, and the 
ornament of the anterior scales is conspicuous. 
Beckles Coll. 
P. 3579 a. Remains of the trunk of a similar fish, showing the 
axial skeleton. The hypocentra in the abdominal region 
are broad and robust, flattened below, each with a pair of 
lateral processes bearing nearly straight slender ribs. 
The neural and haemal arches in the caudal region are 
robust, and appear to be anchylosed with their respective 
pleurocentra and hypocentra. Enniskillen Coll. 
P. 2009. Well-preserved smaller fish, wanting the region behind the 
dorsal fin. The supratemporal and post-temporal plates 
are shown behind the cranium and above the operculum, 
ornamented with tuberculations ; the robust maxilla is 
smooth. The perforations of the scales in the lateral line 
are distinguishable, though inconspicuous vertical slits; 
