120 
ACTINOPTERYGII. 
the pectorals and the anal; anal fin arising opposite the hinder 
portion of the dorsal. Scales smooth, those of the flank with long, 
slender posterior denticulations, which are numerous and closely- 
arranged on the anterior part of the abdominal region, fewer be¬ 
hind ; principal flank-scales considerably deeper than broad ; dorsal 
ridge-scales acuminate and conspicuous. 
Branco recognizes a variety of this species in which the most 
anterior scales exhibit only sparse denticulations, named L. hauche- 
cornei var. paucidentata (loc. cit. p. 356, pi. v. fig. 1). To the same 
variety he also doubtfully assigns some fragments determined as 
L.fittoni by W. Dunker, Monogr. Norddeutsch. Wealdenbild. (1846), 
p. 63, pi. xiv., pi. xv. fig. 8. 
Form. Log. Wealden : Obernkirchen, Prussia. 
Not represented in the Collection. 
The following specifically indeterminable specimen exhibits scales 
much resembling those of L. hauchecornei :— 
28622. Opercular and pectoral region of a very large fish, with part 
of the abdominal squamation; Purbeck Beds, Swanage. 
The operculum measures 0*1 in maximum depth and 0055 
in maximum width, and is rugose though very sparsely 
tuberculated. It is more than four times as deep as the 
suboperculum, which is similarly rugose and exhibits the 
usual antero-superior ascending process. The serrations 
on the flank-scales are probably enlarged by imperfect 
preservation, but they must nevertheless have been origi¬ 
nally very conspicuous. Purchased , 1853. 
Lepidotus mawsoni, A. S. Woodward. 
1860. Lepidotus , Sir P. Egerton, in S. Allport, Quart. Journ. Geol. Soc. 
vol. xvi. p. 265, pi. xiv. figs. 5-13, pi. xv. figs. 1-4, pi. xvi. 
figs. 10-12. 
1888. Lepidotus maivsoni , A. S. Woodward, Ann. Mag. Nat. Hist. [6] 
vol. ii. p. 135. 
Type. Detached scales ; British Museum. 
A large species known only from detached scales, teeth, and 
fragments. Scales much thickened and deeply overlapping; prin¬ 
cipal flank-scales with frequently discontinuous enamel, marked 
with a few broad ridges and furrows radiating from the centre to 
the hinder border, where they form feeble indentations; none of 
the scales serrated. Teeth, apparently of the same fish, rounded 
and comparatively small. 
Form. Loc. Cretaceous : Bahia, Brazil. 
