86 
ACTIXOPTERYGII. 
1837. Lepidotus semiserratus, L. Agassiz, ibid. p. 240, pis. xxix. a, b. 
1849. Lepidotus semiserratus, W. 0. Williamson, Phil. Trans, p. 441, 
pi. xl. figs. 3, 4. 
Type. Imperfect fishes ; Whitby and Scarborough Museums. 
An imperfectly known species, closely related to the typical 
L. elvensis , but apparently distinguished by its more elongated form, 
the maximum depth being contained four times in the total length. 
- The parietal bones also seem to be relatively longer, and the sutures 
between both these elements and the frontals more wavy and 
sharply angulated. 
Form, Log. Upper Lias : Yorkshire 1 . 
All the following specimens were obtained from the cliffs near 
Whitby 
P. 7409. Imperfect fish about 0’55 in length, with the base of the 
caudal fin and fragments of the dorsal and paired fins. 
P. 2012. Larger specimen, exhibiting the ventral and partly lateral 
aspect, with portions of the paired and aual tins, but 
wanting the caudal. Egerton Coll. 
P. 2012 a. Head and trunk, lateral aspect, with well-preserved 
squamation and remains of the paired fins. Some of the 
principal flank-scales are coarsely denticulated upon the 
lower half of their hinder border. The fulcra both of the 
pectoral and pelvic fins are prominent and, though im¬ 
perfectly preserved, appear to have been double. 
Egerton Coll. 
P. 3527. Imperfect fish, lateral aspect, about 0-6 in length, dis¬ 
playing the squamation. Enniskillen Coll. 
P. 3528. Two specimens, ventro-lateral aspect, showing the enlarged 
scales in the anal region, with well-displayed remains of 
the caudal, anal, and paired fins. The smaller specimen 
also exhibits some of the marginal teeth of the upper jaw. 
Emiskillen Coll. 
P. 7410. Head of a large individual with some of the anterior 
scales and the base of the pectoral fins. The general form 
of the mandible and some of its styliform teeth are well 
exhibited. Purchased. 
35556. A small head, with some of the anterior scales and the base 
of the pectoral fins. Purchased, 1859. 
1 Also recorded from Boll, Wiirtemberg, by F. A. Q.uenstedt, Flozgeb. 
Wiirttemb. p. 234. 
