480 
ACTIXOPTERYGII. 
centra annular. Fulcra wanting on the pectoral fins, confined to 
the bases of the median fins. Pectoral fins small, and pelvic fins 
absent; dorsal and anal fins opposed, acuminate in front, extended 
behind. Scales thick, with very thin ganoine ; those of the middle 
of the flank excessively deepened, covering the greater part of it, 
each strengthened within by a broad rib and nearly all the scales 
exhibiting a peg-and-socket articulation ; those of the ventral aspect 
numerous, broader than deep. Lateral line passing directly along 
the deepened flank-scales. 
This genus is doubtfully ascribed to the Pholidophoridae. 
Pholidopleurus typus, Bronn. 
1858. Pholidopleurus typus, H. G. Bronn, Neues Jahrb. p. 12, pi. i. 
figs. 11-15. 
1866. Pholidopleurus typus , R. Kner, Sitzungsb. k. Akad. Wiss., niatk- 
naturw. Cl. vol. liii. pt. i. p. 176, pi. iv. fig. 2. 
1886. Pholidopleurus typus, F. Bassani, Atti Soe. Ital. Sci. Nat. 
vol. xxix. p. 86. 
Type. Nearly complete fish. 
The type species, attaining a length of about 0*1. Length of 
head with opercular apparatus scarcely, if at all, exceeding the 
maximum depth of the trunk, and contained about five times or 
slightly more in the total length of the fish. Anal fin with about 
50 rays, arising at a point twice as distant from the pectorals as from 
the caudal; dorsal opposed to the hinder two-thirds of the anal fin, 
with about 40 rays. External bones and scales smooth, not serrated. 
The outline-restoration published by Bronn (loc. cit. pi. ii. fig. 2), 
being founded on a distorted specimen, is too stout and with a 
relatively too large head. The confusion of Peltopleurus with 
Pholidopleurus is the source of the pelvic fins shown. 
Form, cf* Loc. Upper Trias: Raibl, Carinthia, and Besano, 
Lombardy. 
P. 1099 C, d. Two fine specimens, the first displaying all the fins, 
the second showing the small conical teeth in the maxilla. 
Egerton Coll. 
P. 3618, P. 4409. Three fine specimens, the third vaguely showing 
the axial skeleton of the trunk. Enniskillen Coll. 
33062. Four more imperfect specimens. 
Purchased, 1858. 
