FISHES. MCCULLOCH. 169 



Affinities. This species differs from P. corythceolus 

 Alcock, in its larger number of dorsal rays and photo- 

 phores. It is very near P. africanus Gilchrist and von 

 Bonde, but the number and arrangement of the photo- 

 phores in that species are different from those of 

 P. ill list r is, in which they are uniform in all of my nine 

 specimens. P. africanus has only 25 rays in the anal fin 

 as against 27-32 in P. illustris. 



Localities. Great Australian Bight, south from 

 Eucla, 350-450 fathoms ; 14th May, 1913. 



Great Australian Bight, long. 127 40' E., S.W. of 

 Eucla, 200 fathoms; 29th May, 1913. 



South of Gabo Island, Victoria, 200 fathoms; 6th 

 October, 1914. 



ARGYRIPXUS IRIDBSCENS sp. nov. 

 (Plate xlv, fig. 2.) 



Br. 10; D.13; A.25 ; P.16; V.7; C.19. About 44 

 muscle bands between the shoulder and the base of the 

 caudal fin. 



Depth (30-5 mm.) 3-3 in the length to the hypural 

 joint (103) ; head (31-5) 3-2 in the same. Eye (12) 2-6 

 in the head; interorbital width (6-5) a trifle less than 

 the length of the snout (7), which is 1-7 in the eye. 

 Fourth dorsal ray (18) 1-7, third anal ray (13) 2-4, and 

 pectoral fin (25) 1-2 in the head. 



Head and body strongly compressed ; the dorsal and 

 ventral profiles almost evenly arched anteriorly. Inter- 

 orbital space a little concave, with arched crests above 

 the eyes, from which ridges extend forward converging 

 on the snout. Nostrils close together in the middle of 

 the snout. Eye touching the upper profile. Mouth 

 oblique; the anterior fourth of the upper jaw formed by 

 the premaxillaries, the remainder by the large maxillary 

 which reaches backward to the vertical of the posterior 

 margin of the eye; it is but little expanded posteriorly, 

 and its hinder portion is overlain by a large spatuliform 

 supramaxillary. Premaxillaries, maxillaries, and man- 

 dible each with a single row of curved needle-like teeth, 

 of which those on the maxillaries are no larger than else- 

 where. One or two small teeth on each side of the vomer. 



