96 
ACTINOPTERTGII. 
bones about one-third as long as the frontals, which are three times 
as long as their maximum width, narrow in front, and united by a 
nearly straight median suture; mandibular symphysis not much 
deepened or extended. Marginal teeth on much elongated pedicles, 
the crown obtusely conical in the lower jaw; inner teeth mostly 
larger and obtuse, but on moderately long pedicles. Fin-fulcra 
very large, the principal dorsal fulcra more than half as long as the 
anterior dorsal fin-rays ; pelvic fins arising midway between the 
pectorals and the anal; dorsal and anal fins deeper than long. 
Scales smooth, those of the flank coarsely serrated in the young, 
partly without serrations, partly with few irregular denticulations 
in the adult; scales of lateral line notched; dorsal ridge-scales 
acutely pointed and prominent. 
The large collection catalogued below seems to indicate that the 
individuals of this species grow stouter with age, besides losing the 
conspicuous serrations on the scales of the flank. A restoration of 
a typical fish is attempted in the accompanying fig. 22, of one-half 
the natural size, the only part remaining doubtful being the 
arrangement of the bones of the snout. 
A small fish from the Wealden of the Deister, Hanover, assigned 
to this species by C. Struckmann (Wealdenbild. Hannover, 1880, 
p. 86), has received the provisional name of Lepidotus struckmanni 
(W. Branco, loc. cit. p. 368, pi. vi. fig. 1). 
Form. Sf Loc. Purbeckian: Horsetshire. 
The following specimens were all obtained from the neighbour¬ 
hood of Swanage :— 
19006. Pine adult fish, with imperfect head, about 0’34 in length 
and 0*12 in maximum depth. The dorsal fin-fulcra are 
especially robust, four pairs having a separate insertion 
in advance of the anterior ray; and the principal flank- 
scales exhibit only feeble coarse denticulations in their 
inferior half. Purchased , 1845. 
41157. Equally large individual, wanting the caudal and paired 
fins, displaying some of the ribs and median fin-supports, 
and the squamation of the left side from the inner aspect. 
Some of the left opercular and facial bones are also shown 
from within, and the mandibular ramus exhibits some of 
the splenial teeth on long pedicles posteriorly. 
Purchased, 1868. 
42308. Somewhat larger fish, the squamation shown only in im¬ 
pression and some of the cranial and facial bones from 
the inner aspect. Purchased, 1870. 
