FISHES. MCCULLOCH. 171 



blackish dots form oblique rows along the muscle bands 

 on the upper half, which unite to form a dark patch on 

 the caudal peduncle. All the photophores with black 

 borders. The remainder of the body was apparently 

 silver in life, and such scales as remain show highly 

 iridescent colours of bronze and green. Apical half of 

 dorsal fin black, and a black dot at the base of each ray. 

 Supplementary caudal rays and the outer ray of each 

 lobe black. 



Described and figured from a specimen 128 mm. long, 

 from the Great Australian Bight, 350450 fathoms. 



Variation. A tabulation of the characters of fifteen 

 specimens exhibits some little variation. D. 12-14; 

 A.24-25; P.16-17; V.7. The number of photophores on 

 the sides of the abdomen and before the ventral fins is 

 constant, but those in the curved series behind the ventral 

 vary from 20-21 ; there are always live together above 

 the middle of the anal, and 12-11 pairs beneath the 

 caudal peduncle. Depth 3-1-3-4 in the length to the 

 hypural joint; head 3-2-3-8 in the same. Eye 2-5-2-7 in 

 the> head. 



Affinities. This species is so similar to A. ephip- 

 piatus Gilbert and Cramer, that I separate it with much 

 hesitation. The number of dorsal and anal rays is con- 

 sistently greater in A. iridescens, and the numbers of 

 photophores in the branchiostegal, ventro-anal, and 

 caudal series is slightly different from those of 

 A. ephippiatus. 



Localities. Twenty-six specimens, 90-135 mm. long, 

 are preserved from the following localities : 



Great Australian Bight, south from Eucla, 350-450 

 fathoms; 14th May, 1913. 



Great Australian Bight, long. 127 40' E., 200 

 fathoms; 29th May, 1913. 



Family HALOSAURID.E. 



HALOSAUUUS PECTORALIS sp. nov. 

 (Plate xliii, fig. 3.) 



Br. 18; D.10; A.158; P.16; V.l/9; C.13. About 17 

 scales between the middle of the dorsal fin and the belly. 



Head and trunk (217 mm.) 1-6 in the tail. Head, 

 without opercular lobe (73), a trifle more than half as 



