SEMIOK’OTIDiE. 
89 
28606. Two detached teeth; Great Oolite, Eyeford, Gloucestershire. 
Purchased , 1853. 
47137. Imperfect caudal region, measuring about 0*12 from the 
dorsal fin to the extremity of the upper caudal lobe and 
0-065 in the depth of the caudal pedicle, noticed in Proc. 
Geol. Assoc, vol. xi. p. 292; Great Oolite, Collington, 
Northamptonshire. The scales are shown in impression 
and the median fins are very imperfect. The small anal 
is opposed to the hinder portion of the dorsal. Sharp Coll. 
P. 471. Scale described and figured by Agassiz, op. cit., under the 
name of Lepidotus unguiculatus , and recorded as Lepidotus 
maximus , Agassiz, in Egerton’s 4 Systematic Catalogue,’ 
1837 ; Stonesfield State. Egerton Coll. 
28607, 37219. Three imperfect small scales; Stonesfield Slate. 
Purchased , 1853, 1863. 
47980. Two caudal scales ; Stonesfield Slate. 
Presented by the Hon. Robert Mar sham , 1877. 
P. 1111, P. 3524. Fourteen small scales; Stonesfield Slate. 
Egerton Sf Enniskillen Colls. 
30569. Two small scales; Forest Marble, Atford, near Bath. 
Purchased , 1856. 
Lepidotus latifrons, A. S. Woodward. 
1893. Lepidotus latifrons, A. S. Woodward, Proc. Zool. Soc. p. 560, 
pi. xlix. figs. 1, 2, pi. 1. figs. 1, 2. 
Type. Bones and scales of head and trunk; British Museum. 
A species attaining a length of about 1 metre; form and pro¬ 
portions unknown. External bones rugose and ornamented for the 
most part with closely-arranged tuberculations, sometimes fused 
into short rugse ; parietal bones very unequal in size, averaging 
about half the length of the frontals, which are united in a much- 
jagged median suture, are not much narrowed in front, and are 
about twice as long as broad ; tooth-bearing portion of the dentary 
slender, somewhat deepened at the symphysis; series of supra- 
temporal plates comprising three scale-shaped median ones and a 
relatively large outer pair. Marginal teeth styliform and slender, 
a series of 6 in the premaxilla; inner teeth mostly larger, stouter, 
and obtuse, but fixed on long pedicles. Maximum width of oper¬ 
culum about two-thirds as great as its depth; and maximum depth 
of suboperculum not quite one-third that of operculum. Eing- 
