92 
ACTINOPTERYGII. 
are slender, denticulated, calcified gill-supports. Some 
of the elongated basal bones of the pectoral fin are shown, 
and the coracoid is preserved on the left side. The 
characters of the squamation can be observed, and the 
three enlarged anal scales occur in position. Leeds Coll. 
P. 6899. Portion of trunk in hard nodule, with associated fragments 
of head and fins; Peterborough. Part of the frontals, 
a portion of the right mandibular ramus, and the right 
quadrate are shown. Fragments of the pectoral, pelvic, 
and dorsal fins occur in position, and the dorsal fulcra are 
seen to be remarkably slender. The caudal fin-rays 
exhibit small patches of enamel; and the denticulation 
of the scales is especially well displayed. Leeds Coll. 
P. 6900. Associated set of fragmentary bones and scales, comprising 
. left parietal, right frontal, hyomandibular, ceratohyal, 
supraclavicle, &c., and the three anal scales ; Peterborough. 
The portions of clavicle show several longitudinal close 
series of minute denticulations on the middle of its outer 
face. Leeds Coll. 
Lepidotus notopterus, Agassiz. 
1835-37. Lepidotus notopterus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
p. 257, pi. xxxv. 
1850. Lepidotus notopterus?, V. Thiolliere, Ann. Sci. phys. & nat. 
Lyon, [2] vol. iii. p. 138. 
1852. Lepidotus notopterus , F. A. Quenstedt, Handb. Petrefakt. p. 197, 
pi. xv. fig. 4. 
1863. Lepidotus notopterus, A. Wagner, Abh. k. bay. Akad. Wiss., 
math.-phys. Cl. vol. ix. p. 628. 
1873. Lepidotus notopterus ?, V. Thiolliere, Poiss. Foss. Bugey, pt. ii. 
p. 15, pi. iv. 
1887. Lepidotus notopterus, W. Branco, Abh. geol. Specialk. Preussen 
u. Thiiring. Staaten, vol. vii. p. 382, pi. viii. fig. 5. 
1887. Lepidotus notopterus, K. A. von Zittel, Handb. Palaeont. vol. iii. 
p. 209, fig. 218. 
Type. Well-preserved fish; British Museum. 
A species attaining a length of about 0*4. Length of head with 
opercular apparatus nearly equal to the maximum depth of the 
trunk, and occupying about one-quarter of the total length. Oper¬ 
culum twice as deep as its maximum breadth, which is contained 
more than three times in the length of the head; cranial roof-bones 
with few sparse tuberculations; marginal teeth on much elongated 
