166 
MEMOIRS OF THE QUEENSLAND MUSEUM. 
various examples preserved. The notch in the operculum itself (see Fig. 9) is 
broader than in N. osculus Cope (see Smith Woodward, 1896) and the sub-operculum 
is overlapped by the operculum to a greater extent than in that species, and 
is also situated higher up on the head. The fact that the scales are still to be 
observed in this region indicates that any relative displacement of the bones 
has been small. The other cranial bones are very similar to those of N. 
osculus (see Smith Woodward. 1896 and the reconstruction given by Hussakof, 
1908). There are a few broad branchiostegal rays. No teeth were observed 
in any part of the skull. 
Remarks. — The above remains have been referred to Notogoneus , in spite 
of the absence of denticles on the scales, because of the resemblance of the 
cranial and axial skeleton to that genus. Better material may reveal differences 
sufficient to separate the Queensland remains from Notogoneus , but the affinities 
are certainly with it rather than with Charitosomus. 
The recognition of the presence of a Gonorhynchid in fresh water 
Tertiary strata in Queensland is perhaps the most interesting result of the 
present investigation. Gonorhynchus, the only living genus of the family 
Gonorhychidae, is exclusively marine, and restricted in its occurrence to the 
Indian Ocean and the Western Pacific. Of the already known fossil genera, 
Notogoneus (Upper Eocene to Upper Oligocene of Western Europe and Lower 
Eocene of Wyoming) is elsewhere chiefly or exclusively freshwater, and 
Charitosomus (Upper Cretaceous of Mount Lebanon and Westphalia) chiefly 
or exclusively marine. It is certainly unexpected to find Notogoneus also in 
Queensland, and even more so to find the association of Phare, odus and 
Notogoneus in the lower Tertiary both there and in Wyoming. 
Order Percomorphi. 
Family MORONIDiE. 
Genus PERCALATES RAMSAY AND OGILBY, 1887. 
PERCALATES ANTIQUUS sp. nov. 
(Plates XXI— XXIV ; Text-figures 10-13) 
Locality. — Redbank Plains. 
Material. — [RP/P]. Nineteen specimens preserved in concretionary limonitic 
mudstone. Holotype, No. 5 a , b. 
Description. — Medium sized fishes, estimated maximum known length 
0-25 metres. The dorsal surface from in front of the spinous dorsal to the 
tip of the snout is slightly concave, and the maximum depth of the body 
is just in front of the spinous dorsal. 
