25 
striations. The anal fin is fragmentary in the fossils, bnt must have been 
comparatively small. The apparently complete length of the lower lobe of 
the caudal fin is shown in PI. IY, Fig. 8. 
Squaw ation . — The scales exhibit little more than their shape. In the 
two principal specimens the only markings observable on the remains of 
scales are the concentric lines of growth ; but in one fragmentary specimen, 
perhaps of the same species, there arc impressions of a coarse crimping of the 
posterior margin. The principal flank-scales are slightly deeper than broad, 
while the dorsal and ventral scales are nearly as deep as broad. I he dorsal 
ridge-scales are seen, but not very prominent. The lateral line impresses a 
deep, obliquely-directed groove on each scale traversed. 
Affinities . — This species is distinguished from Semicnotus tenuis and 
S. australis by the less deepened shape of its principal flank-scales. The 
definition given above also separates it from other known species. 
Genus — CLEITIIROLEPIS, Eger ton, 18G,f. 
(Quart. Journ. Geol. Soc., xx, p. 3.) 
Cleithrolepis granulatus, Egerton. 
Obs.—Two imperfect examples of this sjiecies arc included in a 
supplementary collection from the mudstone of St. Peter’s, sent to me by 
Mr. J. E. Carne. 
Family — PH0LID0PH0 R IDiE. 
Genus — PHOLIDOPHOIMJS, Agassiz, 1832. 
(Neues Jahrb. f. Min., 1832, p. 145.) 
Ohs . — A small and rather abnormal species of this genus has already 
been described from the Hawkesbury Beds at Gosford. A unique specimen 
in Mr. Dunstan’s collection from St, Peter’s seems to represent a more 
ordinary member of the genus. 
§8125 F 
