﻿420 CROSSOPTERYGII. 



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 ba si-branchial, inferior aspect ; Lewes. 



Mantell CoU. 



28388. Similar specimen, showing also the inferior two-thirds of 

 the clavicles and portions of the infraclavicles ; Lewes. 

 The infraclavicle (PI. XIY. 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 infraclavicle, 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. Nos. 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. 



