BERYCOPSLS. 



forwards, ])ut its inclination is increased hy crnsliing in the original of fig. 1. The 

 sensory canal is abrnptly bent downwards when it reaches the middle of this plate 

 and spreads in a few radiating branches. When the cheek is well preserved it is 

 seen to be completely covered with scales behind and below the circnmorbital ring, 

 and remains of these are observable in fig. 1. As shown by B. M, no. P. GO-1-9, 

 these scales are large and dee})ly overlapping, less conspicuously rugose than the 

 circnmorbital plates, and not serrated. 



The opercular apparatus is complete. The preoperculum (figs. 1, 2, j)(>/).) is 

 very deep and narrow, and not much expanded at the angle, Avhich is greater than 

 a right angle. Its straight ascending limb tapers to its pointed upper end at the 

 hyomandibular suspension of the operculum ; its short lower limb is more Ijluntly 

 pointed below. Its thickened anterior border overhangs the deep groove for the 

 sensory canal ; its narrow hinder wing, when well preserved, is covered with a fine 

 rugose ornament l)ut not serrated. The exact foi'm of the operculum (op.) is 

 difficult to determine, Ijut it only seems to lack an insignificant fragment of the 

 hinder border in fig. 1, and the postero-superior angle in fig. 2. In the former 

 specimen it is completely exposed and exhibits only remains of a radiating rugose 

 ornament in its hinder half. In better preserved specimens, however, as in the 

 original of fig. 2, it is always covered with scales like those of the cheek, and its 

 hinder ornamented portion is very little exposed. The suboperculum (soj).) and 

 interoperculum (/"/?.) are narrow, antero-posteriorly extended bony plates, display- 

 ing a fine rugose ornament when well preserved, never covered with scales. The 

 outline of these two elements seems to be complete in fig. 1, but the lower margin 

 of the interoperculum is accidentally indented in fig. 2. Fragments of branchio- 

 stegal rays (hr.) are see]i in fig. 2, but these are imperfectly known. Three or 

 perhaps four of them are shown on the i-ight side in B. M. no. P. 6465. The 

 branchial arches seem to l)ear a few large pointed gill-rakers (B. M. no. P. 5695). 



The vertebral column is imperfectly known, but it comprises at least 26, 

 perhaps as many as 30 vertebrae. The centra are much constricted cylinders, 

 and most of them seem to be strengthened by a stout, lateral, longitudinal ridge. 

 The arches are all very stout and large. The neural arches are fused with the 

 centra in the alidominal, as well as in the caudal region. The anterior riljs articu- 

 late directly with the centra, but there may have been small transverse processes. 

 There are expanded hypural bones (B. M. no. P. 6465). 



The pectoral arch is suspended from the cranium by a small supratemporal 

 (PI. II, fig. 1, St.), and by a larger, forked post-temporal {2)tt.). The supratemporal 

 is an irregularly crescentic lamina, its concave border smooth and turned forwards, 

 its convex border marked with a rugose ornament and turned backwards. Its 

 antero-superior angle overlaps the epiotic, while its postero-inferior portion is in 

 contact with the exposed laminar part of the post-temporal. This })late {jiff.) 

 tapers a little above, but is truncated lielow where it articulates with the supra- 



