DERCF.TIM. 
187 
exposed from its inner face, but distinctly showing through 
its transparent bone an external ornament of tubercles. 
The triradiate scutes further back are also distinctly 
tuberculated and radiately striated, and in the region 
probably of the pelvic fins three of these are shown to be 
of relatively gigantic size, the hindermost and largest 
nearly as wide as the occiput. Capron Coll. 
41198. Imperfect coiled-up fish in counterpart, showing remains of 
the head and about 52 vertebrae ; Upper Chalk, Charlton, 
Kent. Purchased, 1868. 
43512. Another similar specimen in counterpart, displaying some 
of the caudal scutes ; Upper Chalk, Bromley, Kent. 
Purchased, 1872. 
43574. More imperfect specimen displaying the cranium and pro- 
jecting premaxillae ; Bromley. Purchased, 1872. 
44624. Fragment of caudal region ; Bromley. Purchased, 1873. 
P ■ 1905. Portion of anterior abdominal region ; Kent. 
Egerton Coll. 
P- 1905 a. Portion of trunk ; Dover. Egerton Coll. 
P- 6457. Fragmentary remains ; English Chalk. Heckles Coll. 
43098. Bemains of large skull, probably of this species, showing 
slender clustered teeth ; English Chalk. Wetherell Coll. 
P- 9100. Impression of part of trunk in flint, from beach at 
Hunstanton, Norfolk. 
Presented by B. B. Woodward, Esq., 1899. 
The following species have also been described but are not 
represented in the Collection : — 
Leptotrachelus lovgipinnis, E. D. Cope, Bull. U.S. Geol. Surv. 
Territ. vol. iv. (1878), p. 68. — Upper Cretaceous (Niobrara 
Group) ; Dakota. [Imperfect fish.] 
Leptotrachelus sayittatus, W. von derMarck, Pateontogr. vol. xxii. 
(1873), p. 63, pl.ii. fig. 1. — Upper Cretaceous ; Sendenhoret, 
Westphalia. [Imperfect fish ; Academy of Munster.] 
Leptotrachelus virgulat-us: Triamaspis virgulatus, E. D. Cope, 
loc. cit. 1878, p. 67. — Upper Cretaceous (Niobrara Group); 
Dakota. [The type species of Tricenaspis. Imperfect 
fish.] 
