9 
(Z») Head and pectoral fin of a smaller individual, shown of the 
natural size in PL III, Pig. 1. 
(c) Imperfect head and trunk of a small individual, 0'215 in length. 
{(1) Dorsal liu of a large individual, shown of the natural size in 
PL II, Pig. 4. 
{e) Caudal pedicle, with portions of the caudal and anal fins. 
General Form . — The largest specimen (PL II, Pig. 3), measiu*es at least 
0'435 in length, and of this the head and opercular apparatus extend about 
0'09. The trunk is of almost uniform depth as far as the dorsal fin, equalling 
perhaps 0'095 ; and the caudal region gradually tapers to a stout caudal 
pedicle, produced terminally into a large upper lohe. All the fins are large 
and powerful. 
Head and Opercular Apparatus. — Nothing can he discerned of the 
cranial hones or the suspensorium, hut the marked ol)liquity of the latter is 
indicated Ijoth in PL II, Pig. 3, PL III, Pig. 1, and in No. d. The deeply cleft 
character of the gape is also very evident, and some indications of the 
elements of the ujiper jaw are ohservahle in the second fossil. A very short 
tooth-l)earing element, probably the premaxilla, occurs in front, at the 
extremity of the snout (PL III, Pig. 1, pni.v.) ; and a large narrow, hut gradu- 
ally widening, impression behind seems to he due anteriorly to the maxilla 
{mx.), and posteriorly to the palato-pterygoid arcade, the former half being 
j)rovided witli small conical teeth like those of the premaxilla. The lower 
jaw is somewhat sliorter than the upper ; hut tlie dentary element (d) is 
relatively long and slender, and this hears a few widely-spaced conical teeth 
of larger size than any exhibited in the opposing dentition. 
Behind the head, indications of the opercular apparatus are observed, 
of comparatively small dimensions. Unless appearances in No. 6 (PL III, 
Pig. 1) are deceptive, the operculum {op.) is very small and triangular, while 
the suhoperculum {s.op.) is at least twice as deep, quadrilateral, and of 
uniform breadth. B^emains of some of the branchiostegal rays {hr.) are 
preserved l3eneath, quite of the ordinary Palmoniscid character. 
Appendicular Skeleton. — In all the fins, the rays are broad and much 
fiattened, with a longitudinal median keel ; and, except perhaps in front of 
the pectorals, they are articulated, and divide distally into fine filaments. In 
