XIPHlIDjE, 
493 
the latter is evidently well ossified, and the postfrontal or 
sphenotic (pt.f.) is seen on both sides. The frontal hones 
(/r.) are incomplete anteriorly. All the bones have the 
peculiar squamous and radiating texture, well represented 
in the figure. Purchased, 1857. 
36133. Two imperfect rostra, one shown in outline in fig. 18, no. 1 
(p. 496), the other in three transverse sections, fig. 18, 
nos. 1 a,h. Cl Sheppey. The proximal transverse section 
of the second specimen (no. la) exhibits incomplete 
fusion of the premaxillse, and a large median cavity with 
which the upper pair of premaxillary canals are confluent. 
The next transverse section (no. 1 h), which corresponds 
approximately with the line marked h in no. 1, shows the 
premaxillse fused and the central cavity small, with two 
pairs of nutritive premaxillary canals. The third trans¬ 
verse section (no. 1 c) has the canals, but not the central 
cavity. Purchased, 1861. 
38921. Small hinder portion of cranium, doubtfully referred to 
young of this species ; Sheppey. Bowerhank Coll. 
The following Xiphioid vertebral centra probably belong to this 
genus, some perhaps to this species :— 
38887-88. Tour specimens ; London Clay, Sheppey. 
Boiverhank Coll. 
P. 4301. Two large abdominal vertebral centra associated in matrix; 
Sheppey. Enniskillen Coll. 
39444. Three imperfect large caudals, associated in matrix ; 
Sheppey. Bowerhank Coll. 
P. 165. Small abdominal vertebral centrum ; Sheppey. 
Purchased, 1880 
« 
30530. Small caudal; Sheppey. Purchased, 1855. 
32389. Two very small centra ; Sheppey. Purchased, 1857. 
P. 5441 a. Imperfect caudal centrum ; Bracklesham Beds, Brackles- 
ham, Sussex. Presented hy P. E. Coombe, Esq., 1888. 
The following imperfect Xiphioid rostra are not generically 
determined:— 
P. 1765. Portion of depressed and much-elongated rostrum, showing 
one central canal; London Clay, Sheppey. Egerton Coll. 
