25 
only about one-halt' their height, hut otherwise of a very similar character. 
It is also probable that outside this dentition, a row of v^ery small teeth 
occupies the extreme margin; for in No. c such a series is to he seen, and 
its components are too small to he considered equivalent to the lesser teeth 
of No. b. All the teeth are destitute of complete sockets, and are anchyloscd 
to the hone. 
The opercular hones arc not distinctly shown, hut in the type-specimen 
there are indications of an operculum corresponding in shape and size to that 
of the typical B. striolatus from llaihl. 
Axial Sheleton of Trunk. — In every example of the trunk, there is a 
well-marked vacant space between the opposed series of neural and hremal 
arches ; and it may, therefore, he inferred that the notochord was persistent. 
In some cases, moreover, as in the originals of PL IX, Pigs. 1, 2, the space 
between the two sets of arches has been much increased by crushing — a 
circumstance suggestive of the same conclusion. In the type-specimen the 
respective lengths of the abdominal and caudal regions arc about 0T8 and 
0T45 ; and the pelvic fins arc placed nearly at the hindermost extremity of 
the former. In both regions, the neural arches (PI. X, Pig. 2, n) are all 
exj)anded, and each neural spine is broad at its base, gradually tapering to a 
pointed distal extremity. In the caudal region, the hannal arches and spines 
(PI. X, Pig. 2, h) are also similar to these, and exhibit complete symmetry 
wdtli those neurals opposed to them In the abdominal region, a series of 
robust, nearly straight ribs is conspicuous, giving to imperfect specimens the 
false appearance of a covering of deep lateral scales, like those characterizing 
the genus Belonostomus. The ty^ie-specimen (PI. IX, Pig. 1) exhibits the 
ril)s of the left side to the number of at least nineteen, and it is not 
improbable that these were succeeded by others too little ossified to be preserved. 
Each rib is expanded at its proximal extremity, the successive expansions 
doubtlessly being more or less connected one with another ; and this affords 
an explanation of their regular linear arrangement even when displaced. 
Appendicular Skeleton. — The paired fins have already been referred 
to — the pectorals as probably small and delicate, the pel vies as being of 
considerable size and placed near the hinder extremity of the abdominal 
region. The latter are also remarkable for the length of their base-line. 
There is no trace of the basal (“ pelvic”) bone, but the fin-rays are at least 
sixteen in number (PI. IX, Pig. 2), and each is comparatively broad and 
