148 
ACTIXOPTERYGII. 
on the opercular and cheek-plates. Teeth robust, unicuspid in the 
marginal series of the mandible. Tubercles on the dorsal and 
ventral scales very coarse and usually fused into rugae; the scales 
of the flank scarcely deeper than broad, not serrated, and covered 
with smooth enamel, which exhibits a coarse rugosity or digitation 
towards the anterior border. 
Form. ^ Loc. Upper Lias: Wiirtemberg. 
19659. Pish about 0*43 in length, with very imperfectly preserved 
head and abdominal region, but displaying the general 
form and proportions and some of the scales; Boll. 
Purchased , 1845. 
19659 a. More imperfect fish, in counterpart, exhibiting the squa- 
mation, the operculum and suboperculum, remains of 
some of the head-bones, and the lower marginal teeth ; 
Boll. Purchased, 1845. 
P. 7429. Similar specimen with well-preserved scales and opercular 
bones. Purchased. 
P. 2015-6. Two imperfect specimens. Egerton Coll. 
Dapedius granulatus, Agassiz. 
1835. Dapedius granulatus , L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 190, 
pi. xxv. figs. 2-6. 
1836-43. Tetragonolepis pustulatus, L. Agassiz, ibid. p. 201, pi. xxiii. c. 
[Anterior portion of fish ; British Museum.] 
1849. Dapidius granulosus , W. C. Williamson, Phil. Trans, p. 445, 
pi. xl. figs. 5, 6. 
1854. PEchmodus pustidatus, J. Morris, Catal. Brit. Foss. p. 317. 
1888. Dapedius cycloides, W. Deecke, Mittheil. Comm. Geol. Landes- 
Unters. Elsass-Lothringen, vol. i. p. 209, pi. iii. [Nearly complete 
fish; collection of Herr Fiirst, Buprechtsau, near Strassburg.] 
1890. Dapedius granulatus , Woodward & Sherborn, Catal. Brit. Foss. 
Vertebrata, p. 58. 
Type. Imperfect head and anterior abdominal region; Oxford 
Museum. 
The largest known species, attaining a length of 0*6. Maximum 
depth of trunk equalling or slightly exceeding its length (exclusive 
of the caudal fin) and about four and a half times as great as the 
depth of the caudal pedicle. Head with opercular apparatus 
occupying one-quarter of the total length of the fish; the external 
bones ornamented with numerous coarse, rounded tuberculations, 
very rarely fused into rugae. Marginal teeth stout, the majority 
