484 
ACTIN0PIERYG1I. 
P. 1101. Imperfect specimen labelled by Egerton ; Swanage. There 
are crushed remains of ring-vertebras, and the origin of 
the dorsal fin appears to be directly opposed to that of 
the anal. Egerton Coll. 
Pleuropholis crassicaudata, Egerton. 
[Plate XIV. fig. 5.] 
1858. Pleuropholis crassicaudus, Sir P. Egerton, Figs. & Descript. Brit. 
•' Organic Remains, dec. ix. (Mem. Geol. Surv.), no. 7, p. 3, pi. vii. 
fig. 2. 
Type. Imperfect fish ; collection of Rev. P. B. Brodie. 
A small, comparatively robust species attaining a length of about 
0*06. Length of head with opercular apparatus about equalling 
the maximum depth of the trunk, and contained slightly more 
than five times in the total length of the fish ; width of caudal 
pedicle equalling about two-thirds the depth of the flank-scales 
in the middle of the abdominal region. Pelvic fins arising mid¬ 
way between the pectorals and the anal; distance between the 
origin of the pectoral and anal fins nearly twice as great as that 
between the origin of the latter and the caudal. Scales smooth, not 
serrated. 
This definition of the species is based upon the specimen recorded 
below. 
Form. Sf Loc. Lower Purbeckian (“ Insect Bed ”): Durdlestone 
Bay, Swanage, Dorsetshire. 
43615. Well-preserved fish shown of the natural size in PL XIV. 
fig. 5 ; in marl from the “ Dirt Bed ” series. The propor¬ 
tions of the head and relatively large eye are indicated, 
and the squamation is distinct. Of the fins only the 
dorsal is entirely wanting, and the others exhibit traces J 
of fulcra. The scales are shown to be united by peg- 
and-socket articulation, and there are four series beneath 
the deepened flank-scales, while only two or three 
can be recognized above. The lateral line passes 
from the hinder angle of the cranium across the first 
(and perhaps the second) deepened flank-scale, is then 
deflected down the second (perhaps third) scale, and 
thence passes directly along the upper series of ventral 
scales, which are slightly deeper than those below. 
Purchased, 1872. 
