168 
MEMOIRS OF THE QUEENSLAND MUSEUM. 
The cranial bones do not differ markedly from those of the living 
P. colonorum (Gunther). The pre-operculum is spinous, the spines on the lower 
limb antrorse, but exhibiting great variations (see Fig. 11). The operculum 
has two spines. The upper and lower pharyngeals (see Fig. 12), the vomer, 
palatines, premaxillae, maxillae, and dentaries bear villiform teeth. The maxilla 
has a supplemental bone. The sub- orbitals are serrated. The skull roof is 
simple, and differs little from that of P. colonorum. The parietals. which are 
Text-figure 12. — Percolates antiquus sp. nov. a , right lower pharyngeal [RP/P] lb, X 3/2; 
b, c, upper pharyngeals ; b, [RP/P] 12 ; c, [RP/P] la. 
separated by the supraoccipitals, apparently extend round the sides of the 
frontals more than in that species. There are (?) six branchiostegals. The 
mouth is large and protrusible (see Plate XXI). 
Text-figure 13. — Percolates antiquus sp. nov. [RP/P] 17a. X 1. Roof of skull, eo, ox-occipital 
fr, frontal; par, parietal; pt, post -temporal ; so, supra-occipital. 
Genus PERCALATES (?) RAMSAY AND OGILBY, 1887. 
Locality . — Oil shales, West of Strathpine and East of Bald Hills, near 
edge of Bald Hills basin. 
