PHOLIDOPIIOHID2E. 
483 
tuberculations ; maxilla more or less arched and the oral margin 
convex ; teeth minute. Vertebral centra annular. Fulcra present 
on all the fins. Pelvic fins well developed, but smaller than the 
pectorals; dorsal and anal fins longer than deep, opposite. Scales 
thick and moderately overlapping; those of the middle of the 
flank excessively deepened, covering nearly the whole of it, each 
strengthened within by a broad rib and exhibiting a peg-and-socket 
articululation ; dorsal and ventral scales few, relatively small and 
rhomboidal. Lateral line deflected, passing down the second or 
third deepened flank-scale and then traversing the uppermost series 
of small ventral scales. 
Flenropholis attenuata, Egerton. 
1854. PleuropJiolis attenuatus , J. Morris (ex Egerton, MS.), Catal. Brit. 
Foss. ed. 2, p. 339 (name only). 
1858. PleuropJiolis attenuatus , Sir P. Egerton, Figs. & Descript. Brit. 
Organic Remains, dec. ix. (Mem. Geol. Surv.), no. 7, p. 1, pi. vii. 
fig. 1. 
Type. Nearly complete fish ; olim Bristow Collection. 
The type species attaining a length of about 0*05. Length of 
head with opercular apparatus slightly exceeding the maximum 
depth of the trunk and contained about five times in the total length 
of the fish; caudal pedicle slender, its width equalling about half 
the depth of the flank-scales in the middle of the abdominal region. 
Opercular bones smooth. Pelvic fins arising midway between the 
pectorals and the anal; dorsal fin with ten rays, arising directly 
opposite to the origin of the anal fin, which has at least twelve rays, 
and arises nearly midway between the pectoral and caudal fins. 
Scales smooth, not serrated. 
Form, Log. Middle Purbeckian: Apsel Lane, near Sutton 
Mandeville. 
Not represented in the Collection. 
Fleuropholis longieaudata* Egerton. 
1858. PleuropJiolis longicaudus, Sir P. Egerton, Figs. & Descript. Brit. 
Organic Remains, dec. ix. (Mem. Geol. Surv.), no. 7, p. 3, pi. vii. 
fig. 4. 
Type. Nearly complete fish ; olim collection of W. Brodie. 
A fish not yet clearly distinguished from the type species, but 
apparently with slightly less deepened flank-scales. 
Form. Sf Log. Middle Purbeckian : Dorsetshire. 
2 t 2 
