88 
ACTIXOPTERYGII. 
1871. Pycnodus midis, J. Phillips, ibid. p. 180, wmcdc. xl. fig. 1. [Mandi¬ 
bular ramus; Oxford Museum.] 
1890. Lepidotus unguiculatus, A. S. Woodward, Proc. Geol. Assoc. 
yoI. xi. p. 292, pi. iii. figs. 7, 8. 
1892. Lepidotus unguiculatus , A. S. Woodward, ibid. vol. xii. p. 239. 
Type. Left suboperculum ; Oxford Museum. 
This specific name was originally applied to a large, coarsely- 
tubereulated suboperculum from the Stonesfield Slate, erroneously 
regarded by Agassiz as a scale. No second example has been dis¬ 
covered, and the only known remains of Lepidotus of the same age 
are fragmentary. It is thus impossible, as yet, to define L. tuber- 
culatus scientifically ; and we merely adopt the name provisionally 
for all the scattered remains of Lepidotus discovered in the English 
Bathonian formation. Such remains have hitherto been described 
as L. unguiculatus , Ag. ; but since the type specimen of the latter 
species was obtained from the Kimmeridgian of Bavaria, it is ex¬ 
tremely improbable that the Bathonian fossils pertain to the same 
fish, while it may be regarded as certain that at least a large 
proportion of these specimens will eventually prove to have been 
correctly referred to the position where they are now placed. 
A premaxilla in the Northampton Museum exhibits four robust 
styliform teeth ; and all the teeth on the inner elements hitherto 
discovered in the Bathonian are rounded and stout, though fixed 
on comparatively loug pedicles. The teeth of the dentary bone, 
known in two specimens from the neighbourhood of Oxford and in 
one from Orton, near Peterborough, are not acuminate, but smaller 
than the splenial teeth and with more slender pedicles ; the splenial 
teeth do not appear to form more than three irregular concentric 
series, and the crown in some is oval. The principal flank-scales 
exhibit two, three, or more large slender denticulations in the lower 
half of the hinder margin. 
Form. Sf Loc. Bathonian : Oxfordshire, Gloucestershire, Somerset¬ 
shire, Wiltshire, and Northamptonshire. 
P. 1111 a. Small right squamosal, showing rugosity and course of 
slime-canal; Stonesfield Slate, Stonesfield, near Oxford. 
Egerton Coll. 
47141. Imperfect mandibular ramus, with dentary and some splenial 
teeth ; Great Oolite, Orton, near Peterborough. 
Sharp Coll. 
P. 7411. Fragment, apparently of upper dentition; Eorest Marble, 
Stanton, Wiltshire. Cunnington Coll. 
