438 
ACTINOPTERYGII. 
Belonostomus cinctus, Agassiz, 
1837-44. Belonostomus cinctus, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 
p. 142, pi. lxvi. a. figs. 10-13. 
1850. Belonostomus cinctus, F. Dixon, Geol. Sussex, p. 367, pi. xxxv. 
figs. 3, 3*. 
1888. Belonostomus cinctus , A. S. Woodward, Quart. Journ. Geol. Soc. 
yol. xliv. p. 145, pi. vii. figs. 7-13. 
Type. Portion of squamation ; British Museum. 
An imperfectly known species of large size, the cranium attaining 
a length of at least 0’24. Jaws very slender, the presymphysial 
bone 15 times as long as its maximum depth, keeled below, 
marked with feeble longitudinal striae, and overlapping the mandi¬ 
bular symphysis in an oblique suture ; teeth obtuse, mammillated, 
on the splenial bone, and the median series on the presymphysial 
bone large, sharply conical, and well-spaced. Scales of dank 
smooth, those of the dorsal region marked with delicate longitudinal 
rugae; the scales of the lateral line truncated inferiorly and much 
exceeding in depth the series below, those on the anterior portion 
of the abdominal region being about four times as deep as broad. 
A mandible of this species in the Brighton Museum shows the 
dentary completely excluded by the splenial from the oral border. 
Form. Sf Loc . Upper Cretaceous : S.E. England. 
4266. Type specimen showing inner aspect of part of the squama¬ 
tion of the flank, described and figured by Agassiz, Poiss. 
Foss. vol. ii. pt. ii. p. 142, pi. lxvi. a. fig. 13 ; Upper 
Chalk, Lewes, Sussex. Mantell Coll. 
P. 7578. Fragment of squamation showing smooth flank-scales and 
ornamented dorsal scales ; English Chalk. 
History unknown. 
4267, 4268. Two imperfect presymplr^sial bones, noticed and 
figured by Agassiz, loc. cit. p. 142, pi. lxvi. a. figs. 10-12; 
Lewes. Mantell Coll. 
39057. Presymphysial bone, split longitudinally ; Chalk, Burham, 
Kent. Bowerbank Coll. 
P. 3804. Portion of presymphysial bone; Burham. 
Enniskillen Coll. 
P. 5627. Portion of presymphysial bone; Kent. Harford Coll. 
