DERCETID^. 
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 relatixely 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 o2 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. JJ ore imperfect specimen displaying the cranium and pro- 
jecting premaxillae ; Bromley. 1872.'^^^"^ 
44624. Fragment of caudal region ; Bromley. Purchased, 
P. 1905. Portion of anterior abdominal region ; Kent. 
P. 1905 a. Portion of trunk ; Dover. 
P. 6457. Fragmentary remains; English Chalk. 
Egerton Coll. 
Egerton Coll. 
BecTcles Coll. 
43098. Eemains of large skull, probably of this species, showing 
slender clustered teeth ; English Chalk. Wetlierell Coll. 
P. 9100. Impression of part of trunk in flint, from beach at 
Hunstanton, Korfolk. 
Presented hy B. B. Woodward, Esg., 1899. 
The following species have also been described but are not 
represented in the Collection :— 
Leptotrachelus longipinnis, E. D. Cope, Bull. U.S. Geol. Surv. 
Territ.^vol. iv. (1878), p. 68.—Upper Cretaceous (Kiobrara 
Group); Dakota. [Imperfect 
Leptotrachelus sagittatus, W. von derHarck, Palaeontogr. vol. xxii. ^ - 
(1873),p.63,pl.ii.fig. 1.—Upp Cretaceous; Sendenhorst,^^*^^"^^^'*’^®^^^ 
”\Yestphalia. [Imperfect fish ; Academy of Hiinster.] 
I^eptotrachelus virgulatus: Tricenaspis virgidatus, E. D. Cope, ' * ' * 
' loc. cit. 1878, p. 67.—Upper Cretaceous (Niobrara Group); 
Dakota. [The type species of Tricencespis. Imperfect 
fish.] 
