HORN EXPEDITION—PISCES. 
177 
l)ody; interorbital space flat. Its width is twice as much as tlie diameter of tlie 
eye, and ratlier more than the distance from the tip of the snout to the anterior 
margin of the eye. The maxillary reaches to aliout one-tliird below the diameter 
of the eye, and its length is about equal to the distance from the tip of the snout 
to the anterior margin of the eye ; lips thick, cleft of tlie mouth oblique; pr.'B- 
orbital smooth and not serrated on its lower margin; praioperculum nearly 
semicircular, denticulated on its posterior margin, but this can only be noticed 
after the skin has been removed. Operculum with two flat obtuse spines, which 
terminate in two blunt points in the largest specimen ; but these points are single, 
and sharp in the smaller ones. Coracoid denticulated on its upper margin ; lateral 
line distinct, bending downwards below the soft portion of the dorsal fin. It 
occupies about forty-six scales. Scales semicircular, ctenoid. Upper region of the 
head and neck scaleless, supraorbital space with four shallow longitudinal grooves. 
Prieoperculura with seven or eight rows of scales, operculum with four or five 
rows. 
Colouration .—Dark above, yellow beneath. All the scales, except on the belly, 
are more or less tinged and spotted with a bright steel-blue tint; those on the 
belly are silvery. All the fins, except the ventrals, are of a blackish colour. The 
teeth are strong, pointed, and curved inwards. Innerside of lips with numerous 
fleshy papillie. 
The type specimen described by the late Hon. Sir W. Macleay was caught in 
the Endeavour River. 
Localities .—Red Bank Creek, Finke River, Palm Creek, and Walker’s Gorge. 
(2) Therapon percoides, Giinth. (Fig. 1.) 
Ann. and Mag. Nat. Hist., Vol. XIV., p. 374. 
D. 13/9. A. 3/7. L. lat. 39. L. transv. 7/13. 
The length of the largest specimen from Red Bank Creek, McDonnell Ranges, 
is three inches without the caudal fin; the height of body one and one-eighth inch; 
the length of the head is contained three and one-half times in the total length. 
Upper surface of head scaleless; interorbital space with four longitudinal grooves, 
the length of the snout is equal to the diameter of the eye and a little longer than 
the width of the interorbital space. Mouth small, the maxillary does not reach 
to below the anterior margin of the orbit. Prajorbital with six small, sharp, 
pointed, slightly-curved spines on its lower margin. Pneoperculum serrated, but 
