60 RAMSAY H. TRAQUAIR’S 
externally, beautifully striated in the direction of their length, with fine straight 
ridges ; anteriorly the transverse articulations are distant, forming joints which 
are considerably longer than broad ; posteriorly they become closer, and the 
joints nearly square, though even here the articulations are more distant 
towards the extremities of the rays. 
The anal fin is in a better state of preservation; its base, commencing 
3 inch behind the origin of the ventral, and extending to the tail pedicle, attains 
only one-half the length of that of the dorsal opposite. Anteriorly it is acu- 
minate, the rays rapidly elongating until a length of 14 inch is attained at the 
eleventh, whence the contour of the fin again falls away, the posterior part 
being fringe-like, and with rays of about 4 inch in length. The rays are similar 
in character to those of the dorsal, being finely striated longitudinally, and 
having their transverse articulations distant in the anterior and close in the 
posterior rays; they are also seen to dichotomise towards their extremities, 
while the anterior margin of the fin is set with very distinct fulcra. 
The caudal is of moderate dimensions, heterocercal, and deeply cleft, but in 
this specimen the lower lobe is deficient towards the apex. The rays of the 
lower lobe are pretty stout, divided by closer articulations than those of the 
dorsal, and are rather punctured than striated, although striz appear as we 
pass to the upper division of the fin ; the anterior margin is distinctly fulcrated. 
The rays of the upper lobe are short and delicate, with rather close articulations, 
which, however, still leave the joints rather longer than broad. On the scales 
of this caudal body-prolongation regular striation has disappeared, the orna- 
ment being now reduced to indented furrows and punctures. 
There are two fragmentary specimens in the collection, of which especial 
notice must be taken. One of these represents a portion of the back with the 
upper part of the head of a considerably smaller example than that last de- 
scribed, and showing the anterior part of the dorsal fin in a perfect condition. 
We have here a clear demonstration of the very large development of this fin, 
its longest rays, forming the apex, being larger by one-eighth than the distance 
between the commencement of the fin and the posterior margin of the parietal 
bone. Unfortunately, the hinder part of the fin is not included in the specimen, 
but it is evident that its free margin does not fall away behind the apex, as in 
the case of the anal, and that, consequently, the contour is not so acuminated. 
The anterior margin is distinctly fulcrated. 
In another fragment the entire caudal and anal fins are shown with some 
remains of the ventral. The two latter yield no information beyond what may 
be learned from the first specimen, but the two lobes of the caudal are seen to 
be, as nearly as possible, of equal length. The caudal body-prolongation is, as 
is characteristic of this genus, weak and slender, but its scales are traceable to 
the extremity of the upper lobe. 
