41 
1) ones of the pectoral arch are sufficiently displaced aud exposed for precise 
description. The pectoral fin is very large, and placed upon the side of the 
trunk slightly l)elo\v the level of the lower margin of the snl)opercnlnm. In 
the original of PL VII, Pig. 1, not less than twelve or thirteen rays can he 
counted, spreading distally, and being at least equal to the head in length. 
The pelvic fins (PI. VIII, Pig. 2) were evidently smaller, though well 
developed for a fish of this type. 
Of the median fins (PL VII, Pig. o), the dorsal is longer than the 
anal, hut relatively less elevated ; and the posterior points of termination of 
these fins seem to corres 2 iond, the anal thus arising further back than the 
dorsal. In each fin, the rays gradually diminish in length backwards, and 
are most widely spaced posteriorly ; they are about seventeen in number in 
the dorsal, and not more than twelve iji the anal. Both in these fins and in 
the caudal, the rays are stout, exhibit numerous articulations, and begin to 
bifurcate at a considerable distance from the distal extremity, and the fulcra 
upon the anterior margin are prominent. The caudal fin is well shown in 
PL VII, Pig. 5, being very large and powerful, consisting of twenty-four to 
twenty-six rays, widely spread, and slightly forked ; at its base also are a few 
large fulcral scales, both above and below. 
Squaniation . — Though individual scales are rarely distinguishable, the 
general characters of the squaniation can be well determined. Sir Philip 
Egerton has already pointed out that the scales arc deep, superficially granu- 
lated, and united together by a peg-and- socket arrangement of the anterior 
thickened margin. It is now possi1)le to add some interesting information 
concerning their variation and disposition. The lateral line is prominently 
marked in sjiecimens sufliciently well preserved (not in PL VII, Pigs. 1 and 
2) , by its perforation of a horizontal scries of scales almost along the middle 
line of the flank ; and in one specimen (No. h) these scales towards the 
posterior part of the abdominal region arc seen to be five or six times as deep 
as broad, witli the perforation marking the lower limit of the superior third 
or slightly above the middle point (PL VII, Pig. C). The scales above and 
below this series are also much deeper than broad, except near the dorsal and 
ventral margin ; and upon the caudal region, at the point of origin of tlie 
dorsal fin, the vertical series of scales are rapidly narrowed, though in some 
specimens this feature is evidently emphasised by distortion during fossili- 
zation. jMorcover, to a depth of about 0 005 from the base both on the 
dorsal and anal lins, the series of scales arc distinctly displaced from their 
