16 NOTES FROM THE AUSTRALIAN MUSEUM, 



entirely inside the maxillary teeth ; the width of the gape of the 

 mouth is 7 of the length of the head. Median longitudinal groove 

 shallow and indistinct; occipital process narrow, the width of its 

 base being one half of its length, the sides are convergent behind 

 to immediately in front of the basal bone of the dorsal fin round 

 which they bend outwards ; posterior part of the head granulated. 

 The maxillary barbel reaches to the lower angle of the opercle, the 

 external mandibular to the base of the pectoral. A broad band of 

 obtusely conical villiform teeth on the jaws ; the vomei^ine teeth 

 form two small square patches, about their own length apart, and 

 contiguous with the divergent palatine bands, which are thrice as 

 long as broad. The dorsal fin is higher than the body, the spine 

 as long as the head excluding the snout ; it is roughened on its 

 lower part anteriorly, weakly serrated on its upper half and 

 posteriorly ; the length of the base of the adipose dorsal is ^ more 

 than that of the rayed fin : the pectoral spine is shorter than that 

 of the dorsal, and is weakly serrated on both sides : the ventrals 

 do not reach the anal fin : caudal deeply forked. Colors , brown 

 above, yellowish below ; an oblong white spot on the middle of the 

 occiput. 



Length of the specimen described 12^ inches; register number 

 B. 9,937. 



Hah. Strickland River. 



This species appears to be allied to Bleeker's Arius (Hemiarius) 

 stoi'mi, but it differs greatly in its comparative measurements, in 

 the arrangement and shape of its vomerine and palatine teeth, 

 shape of the occipital process, &c. 



Hemipimelodus dayi. sp. nov. 



B. V. D. 1/7. O : A. 20-21 : V. 6 : P. 1/10 : C. 17. 



Length of head 4|, of caudal fin 4J, height of body 5f in the 

 total length. Diameter of the eye 4J in the length of the head, J 

 of that of snout, and | of the interorbital space. The height of the 

 head nearly equals its width, which latter is equal to its length 

 behind the centre of the orbit. Upper jaw the longer ; the extent 

 of the gape of the mouth is f of the length of head. Upper 



