PHOLIDOI’HORIDJE. 
487 
Pleuropholis serrata, Egerton. 
1858. Pleuropholis serratus , Sir P. Egerton, Figs. & Descript. Brit. 
Organic Remains, clec. ix. (Mem. Geol. Surv.), no. 7, p. 5, pi. vii. 
figs- 5-9- , Y\ (JU ^ . fiv&Q % 
/ X"' Lol Cik'Vis® Z^Hy 4, 
Type. Imperfect fish ; olim collection of Dr. John Lee, Hartwell. 
A species attaining a length of about Ol. Length of head with 
opercular apparatus about equalling the maximum depth of the 
trunk, and contained five times in the total length of the fish ; ^ 
width of caudal pedicle slightly exceeding one-half the depth of the - / 
flank-scales in the middle of the abdominal region. Distance 
between origin of anal fin and that of the caudal scarcely exceeding 
half that between the former and the pectorals ; dorsal fin arising /Jyc 
opposite or just behind the origin of the anal. Scales smooth, but 
those of the deepened series with fine oblique serrations. I 
Form. Sf Loc. Purbeckian : Buckinghamshire. - 
40316-17. Two imperfect fishes, the second wanting the head 
but displaying portions of all the fins ; Bishopstone. 
Purchased , 1867. 
P. 1102. Two fragments; Hartwell. Eyerton Coll. 
Fragmentary remains of a species of Pleuropliolis with serrated 
flank-scales, much resembling P. serrata and not yet distinguished 
from it, have been obtained from the Lower Kimmeridgian (Litho¬ 
graphic Stone) of Cirin, Ain, France. One imperfect fish in the 
Lyons Museum is figured by Thiolliere, Poiss. Foss. Bugey, pt. ii. 
(1873), pi. vi. fig. 5, and subsequently described under the name of 
P. egertoni , H. E. Sauvage ( non Wagner), Bull. Soc. Geol. France, 
[3] vol. xi. (1883), p. 498, pi. xiii. fig. 1. The following is a speci¬ 
men of the same form :— ' /? f * ** PiF* 
P. 4691 a. Imperfect fish originally about 0*07 in length, the head 
and abdominal region and serrated flank-scales displaced; 
Cirin. Purchased, 1884. 
The following specimen is not specifically determined :— 
40724. Head and abdominal region of a comparatively large fish 
with small head and deep trunk ; Purbeck Beds, Swanage. 
The head with opercular apparatus measures (>015 in 
length, and the depth of the deepened scales above the 
region of the pelvic fins is 0 - 013. The scales are smooth, 
none serrated. Purchased, 1867. 
