450 Mr. C. T. Regan on Fishes from 



the eye is larger, and the interorbital space far narrower; in 

 contradistinction to the comparatively short gape and weak, 

 maxilla in P. Alleni, P. atrum has a gape extending far 

 beyond the hind margin of the eye and a stout maxilla with 

 a broad distal end. 



These points are shown by the following percentages, taken 

 from three specimens 80-90 mm. long (without caudal) of 

 P. atrum and the type of P. Alleni'. — 



P. (drum. P. Alleni. 



Length of head 26-2-5 28 p. c. of total lenprth 



(without caudal; . 



„ snout 25-23 24 p. c. of head. 



„ eye 14-12-.'5 1(3-5 „ 



Interoibitar width ... . 2G-23 15 „ 



Height of head 70 55 „ 



Breadth „ 50-45 55 „ 



Length of upper jaw . , 60-55 35 „ 



The following key should suffice (at any rate until further 

 material is available) to distinguish the species apart : — 



Pteridium (Scopoli), GUnther. 



1. Breadth of head not more than half its length or 



f of its height at isthmus. Interorbital width 

 about equal to snout and more than 1^ times as 

 long as eye. Upper jaw broad distally and ex- 

 tending far beyond hind margin of eye P. ntrum (Risso). 



2. Breadth of head more than half its length and 



equal to its height at isthmus. Interorbital 

 width less than length of eye and more than H 

 times in snout. Upper jaw narrow dist;d)y, 

 reaching as far as hind margin of eye P. Alleni, By. 



LXX. — A Collection of Fishes from the King Iiicerj JVestern 

 Australia. By C. Tate Keg an, B.A. 



A SMALL series of freshwater fishes from the King Eiver, 

 Western Australia, collected by Mr. G. C. iShorlridge and 

 presented to the British Museum by W. E. Balston, Esq., is 

 of some interest, although only six species are represented. 



Galaxiidae. 

 Galaxias occidentalis, Ogilby, 1899. 



This species is the only Galaxias so far recorded from 

 Western Australia. 



