420 
CKOSSOPTEKYG1I. 
43851. Fragment of head, displaying the dentary and the apparent 
separation of an extremely-tuberculated infra-dentary 
element; Upper Chalk, Warne’s Place, Rochester. 
Purchased, 1872. 
4246. Scattered remains of head, showing the inner aspect of the 
operculum, parietals, and the right pterygo-suspensorial, 
the latter noticed by Huxley, loc. cit. p. 36; Lewes. 
Mantell Coll. 
4238. Fragment showing parts of the branchial arches and the 
imperfect basi-branchial, inferior aspect; Lewes. 
Mantell Coll. 
28388. Similar specimen, showing also the inferior two-thirds of 
the clavicles and portions of the infraclavicles; Lewes. 
The infraclavicle (PI. XIV. fig. 3, i.cl ) is an elongated, 
slender bone, sharply bent at a point one third of its total 
length from the inferior extremity, and this third appears 
to consist of a triangular expansion in an almost horizontal 
plane; the upper two-thirds are of spatulate form over¬ 
lapping the outer face of the lower end of the clavicle (cl.). 
The figure shows the right iufraclavicle, outer and partly 
inferior aspect, restored in outline from evidence afforded 
by the element of the left side. Mantell Coll. 
4260. Portion of abdominal region, with fragments of head, the 
air-bladder, first dorsal fin, and the basal bone of the 
second dorsal; Lewes. The basal bone of the first dorsal 
fin is noticed by Huxley, loc. cit. p. 38. Mantell Coll. 
4216-17, 4221, 4236, 4241, 4243-44, 4250, 4258-59, 4261-62. 
Ten examples of the trunk, displaying various portions 
of the axial skeleton, the air-bladder, median fins, and 
scales ; Lewes. Xos. 4216, 4241, and 4250 are preserved 
in counterpart, and the third exhibits, in transverse sec¬ 
tion, the longitudinal series of very large hollow spines 
occurring upon the middle of several horizontal rows of 
scales; the perforations are at first sight suggestive of 
the openings of sensory canals. Nos. 4236, 4250 show the 
distal articulation of the caudal fin-rays. Mantell Coll. 
25789. Imperfect trunk exhibiting scales and portions of the median 
fins; Sussex. Dixon Coll . 
25944. Imperfect trunk, showing an apparently lobate pelvic fin, 
noticed by Huxley, loc. cit. p. 33 ; Sussex. Dixon Coll. 
