14 
longitudinal ridges ornamenting the rays. In the type specimen and No. b, 
the pelvic fins are almost completely in advance of the dorsal fin ; and the 
latter specimen seems to show that they are deeper than long. Both the 
dorsal and anal fins are incomplete even in No. b, hut the former seems to 
have been slightly larger than the latter, and it is proved by the type specimen 
to have been supported by the usual double series of cartilages (PI. IV, 
Fig. 1, cl.b., d.a.). The stout, hour-glass-shaped baseosts ( d.b .) are half as 
long as the corresponding axonosts {d.a.), which are distorted in such a 
manner as to suggest that they were only slightly ossified. 
Squamation . — The scales are only well seen in part of the type 
specimen. They are slightly deeper than broad on the middle of the 
flank in the abdominal region, while the dorsal scales are approximately 
equilateral, and those near the ventral border are not much broader than 
deep. The upper and lower borders are straight, and the external face is 
completely covered with ornament (PI. IY, Fig. 1«). The chief portion of the 
ornament consists of oblique ridges, which begin few, broad, and flattened in 
the antero-superior area, and then subdivide into numerous finer ridges, which 
terminate at the hinder border of the scale, perhaps in a finely serrated edge. 
Near the lower border of the scale the ornament consists of fine horizontal 
lines. Two enlarged ovate ridge-scales, closely ornamented with longitudinal 
ridges, occur in front of the dorsal fin in the type specimen ; and there is an 
obscure trace of a similar scale in front of the anal fin in No. b. 
Affinities . — The relative coarseness of the ornament on the antero- 
superior portion of the scales distinguishes Elonichtliys semilineatus from all 
the known species of the same genus. 
Genus — MYRIOLEPIS, Egerton, 1864. 
(Quart. Journ. Geol. Soc., xx, p. 3.) 
Gen. Char . — Trunk fusiform, but robust. Mandibular suspensorium 
very oblique; dentition comprising a spaced series of large conical teeth. 
Fins rather large, with fulcra, the rays branching distallv ; dorsal fin 
opposed to space between pelvic and anal fins ; caudal fin deeply cleft, 
equilobate. Scales very small, obliquely striated, enlarged upon the sides of 
the upper caudal lobe ; ridge-scales of upper caudal lobe prominent. 
