PI10LID0rH0RID.£. 
489 
the fish; maximum depth of trank equalling nearly one-half of the 
length from the pectoral arch to the base of the caudal fin. Dorsal 
fin comprising about 10 rays, arising at the middle point between 
the occiput and the base of the caudal fin, opposite the origin of 
the anal fin, which has not less than 14 rays. Scales exhibiting 
only the concentric lines of growth. 
Form. Loc. Upper Hawkesbury-Wianamatta Series : Talbragar, 
N. S. Wales. 
Not represented in the Collection. 
Genus CERAMURUS, Egerton. 
[Brodie’s Foss. Insects, 1845, p. 17.] 
Trunk not much deepened and head relatively large; notochord 
persistent, surrounded with spaced ring-vertebrae ; ribs short and 
delicate. Ein-fulcra few, long and slender. Pectoral and pelvic 
fins of moderate size ; dorsal and anal fins not extended, the former 
in advance of the latter. [Flank-scales unknown, but] a series of 
robust ganoid ridge-scales on both borders of the hinder half of the 
caudal region. 
Ceramurus macrocephalus, Egerton. 
1845. Ceramurus macrocephalus , Sir P. Egerton, in Brodie’s Foss, 
Insects, p. 17, pi. i. fig'. 2. 
1895. Ceramurus macrocephalus, A. S. Woodward, Geol. Mag. [4] 
vol. ii. p. 401, 
Type. Nearly complete fish ; collection of Bev. P. B. Brodie. 
The type species, known only by a unique specimen 0*043 in 
length. Length of head with opercular apparatus about twice as 
great as the maximum depth of the trunk, and contained about 
four times in the total length of the fish. Dorsal fin with about 
10 rays, opposed to the pelvic pair; anal with about 8 rays, com¬ 
pletely behind the dorsal. Bidge-scales of upper caudal lobe 
especially acuminate and each produced into a long point. 
Form. Sf Loc. Purbeckian : Yale of Wardour, Wiltshire, 
^ ->Net represented in the Collection. 
Some indeterminable immature Triassic fishes, not represented in 
the Collection, but sometimes compared with the Pholidophoridae, 
sometimes with the Leptolepidac, bear the undefined generic name 
of Prohalecites (W. Deecke, Palaeontogr. vol. xxxv. 1889, p. 125). 
Two forms are distinguished as follows :— 
Prohalecites microlepidotus : Pholidophorus microlepidotus, It. 
Kner, Sitzungsb, k. Akad. Wiss., math.-naturw, Cl. vol. liii. 
