424 
ACTIXOPTERYGII. 
truncated below, strengthened with a ridge on its anterior 
margin, and evidently to be interpreted as the left post¬ 
temporal element. The presymphysial bone exhibits its 
characteristic tapering form, with the large unsymmetri- 
cally-placed tooth at its base. Most of the scales are 
exposed from the inner aspect, showing the large peg-and- 
socket articulation and broad, flattened, inner ridge ; but 
the external face is evidently rugose. Purchased , 1867. 
p. 7575. Crushed remains of small head and abdominal region. 
The large teeth on the presymphysial bone are well 
displayed. ' History unknown. 
P. 967 a, b. Two fragmentary specimens of the head and abdominal 
region, the first showing the base of the pectoral fin and 
the rugose ornament of the scales, besides some tuber- 
culated head-bones. Egerton Coll. 
46345—a. Small head, in counterpart, lateral aspect, showing the 
jaws but wanting the dentary bone; also a detached 
rostrum. Cunnington Coll. 
P. 5147, P. 967 c. Imperfect remains of a small head, and a 
detached rostrum. Egerton Coll. 
P. 4281-2. Portions of head in side view, showing the associated 
rostrum, presymphysial bone, operculum, and suboper¬ 
culum, and detached splenial bones. Enniskillen Coll. 
29042-44. Fine large cranium broken across the middle, the cranial 
roof exposed from above and the rostrum from below 
(PI. XVII. fig. 7); an equally large cranium, imperfect 
behind, displayed from the infero-lateral aspect; and a 
detached rostrum with premaxillary dentition. In the 
first specimen, as shown in the figure, the cranial roof is 
ornamented with tubercles and longitudinal rugae, and is 
produced backwards at its postero-lateral angles; the 
frontals (fr.) are evidently large compared with the 
parietals (pa.), though the intervening suture is not very 
clear; and the parasphenoid (pas.) is crushed outwards 
on the right side. At the base of the rostrum a V" s ^ a P e( i 
eminence (y.) on its inferior face seems to represent a 
pair of toothless vomers united in front; and the groove 
between the long dentigerous premaxillas (pmcc.) is con¬ 
tinued forwards along the lower face of the rostral prolon¬ 
gation. The prefrentals (pf.) seem to have been well 
ossified. Purchased , 1854. 
