MANSFIELD DISTRICT, VICTORIA. 
traversed by the usual well-developed slime-canal, while the 
suboperculum is relatively deep. 
Appendicular Skeleton.—Vhe supraclavicle and clavicle are 
seen in the type-specimen as moderately wide plates, which are 
ornamented with fine ridges or striations disposed in the direction 
of the long axis of these bones. There aré also remains of the 
pectoral fins, which show that all their rays were articulated, 
though not very closely, for the greater part of their length. 
Both pelvic fins are likewise imperfectly preserved, arising 
slightly nearer to the anal fin than to the pectorals. Each com- 
prises at least 28 rays, of which all are articulated to the base, 
although the length of the spaces between the joints considerably 
exceeds their width. The dorsal and anal fins must have been 
nearly equal in size and shape, the former completely in advance 
of the latter. ‘They are short and deep, comprising from 25 to 30 
rays, which exhibit distant articulations. Traces of the fringe of 
small and delicate fulera are seen on the anal fin in the type- 
specimen. The caudal fin is imperfect in this specimen, and the 
inequality of its lobes is better seen in the original of PI. IX, fig. 
la. The lower lobe is fringed with a close series of delicate 
fulera, and its rays are very finely divided distally. It is 
uncertain whether any of the fin-rays were ornamented, but 
sometimes they appear to bear indications of fine longitudinal 
ridges. 
Scales.—The principal scales on the flank of the abdominal 
region are shown by the type-specimen to be about as deep as 
broad. Those on the caudal region are somewhat broader than 
deep, while those near the ventral edge of the fish are at least 
twice as broad as deep. ‘Those of the flank are united by a large 
and broad peg-and-socket articulation (Pl. X, figs. 1, la, 10). 
Isolated scales on several specimens show that their overlapped 
anterior border was narrow, as usual in Llonichthys. The outer 
face of all the scales is completely covered with ganoine, which 
forms numerous delicate rounded ridges separated by little sharp 
clefts. These ridges have a general oblique, antero-posterior ’ 
trend, and terminate at the hinder edge of each scale in feeble 
serrations. They often exhibit a tendency to curve upwards in 
[21] 
