TERTIARY FRESH WATER FISHES FROM SOUTHERN QUEENSLAND. 165 
There are 14 caudal and 29 or 20 abdominal vertebrae, which bear a 
strong lateral ridge between deeply excavated dorsal and ventral hollows. 
The last vertebra is continued as a strong urostyle, to which is apposed a 
dorsal element covering the end of the spinal cord. There are 5 or 6 hypurals 
(see Fig. 8). The neural and haemal spines are slender, the ribs even more 
so. Intermuscular bones are present. 
Te -ct -figure 8 . — Notogoneus parvus sp. nov. Detail of caudrl fin. <i. [RP/N] 3 ; b, [RP/N] 5 : 
c, [RP/N] 4. X about 2. 
The caudal fin is slightly excavated at its posterior margin, and has 
about 24 jointed rays, with a few fucral spines. The number of rays in the 
other fins is uncertain, but there are approximately ten or eleven rays and 2 
or 3 small anterior spines in the dorsal, seven rays in the pelvics, and eight 
rays and 1 or 2 spines in the anal. The rays are supported by somewhat 
expanded baseosts. 
The scales are typically Gonorhynchid in shape, being small, subrect angular, 
ornamented with concentric ridges, and possessing a raised posterior border, 
but close examination failed to reveal denticles such as are present in other 
Notogoneus species and in Gonorhynchus . Scales cover the operculum and 
pre-operciilum, and traces of these can be seen on the frontals also, so that 
it is possible that the head was completely covered. 
Text-figure 9 . — Notogoneus parvus sp. nov. [RP/N] 4. x 2. No. F. 2364, Qld. Mus. Coll. 
Holotj pe. or, articular ; b . at, branchiostegal rays ; d, dentary ; fr, frontal ; by, 
hyo -mandibular ; i. op, inter -operculum ; op, operculum ; pa, parasphenoid ; p. op, 
pre-operculum ; qu, quadrate ; s. op, sub -operculum. 
The operculum in one example (No. 4) bears three slits in its posterior 
border, in another (No. 2) four. These characteristics are regarded as of less 
than specific value, as no other significant differences are to be seen in the 
