Bd. V: 6) THE FISHES OF THE SWEDISH SOUTH POLAR EXPEDITION. 67 



fin. A. inartensii KlunzingER and A. splendidus Brauer have a similar number 

 of dorsal rays but have all of them a ventral adipose fin and the origin of the 

 dorsal is situated behind the origin of the ventrals. 



9. Bathylagus euryops GoODE & Bean var. latifrons n. 



I specimen from a depth of 2,700 m. 27th June 1902. 49' 56' S. lat. — 49' 56' 

 W. long. 



D. 9. A. 16. Sq. about 40. 



As may be seen from the measurements recorded below, this fish agrees very 

 well with the species, which has been named as above, except in one respect viz. 

 the interorbital breadth whicli appears to be so much larger in the southern form, 

 that it may deserve to be distinguished by a third name latifrons as a geographic 

 variety. The american ichthyologists who in their work "Oceanic Ichthyology" de- 

 scribed B. euryops said that the width of the interorbital space was "a little more 

 than one half the diameter of the eye". In the present fish, however, the inter- 

 orbital width measured above the middle of the eye is almost as large as the dia- 

 meter of the eye and even in front, above the snout, where the interorbital width 

 is narrowest, it is considerably more than "one half the diameter of eye". 



Total length without caudal 209 mm. 



Length of head 51 » 



Depth of body 44 ' 



Least depth of caudal peduncle 15 > 



Distance from snout to dorsal fin 97 » 



» > dorsal fin to root of caudal 114 ' 



» » vent Î > -^ Î 55 » 



Diameter of eye 23 > 



Length of snout 12 ; 



Interorbital width above ths middle of the eye 21 » 



» > in front on the snout 15 > 



The single specimen has lost its scales, but they seem to have been about 40 

 in a longitudinal series. It is black and the iris is said to have been yellow \\ith 

 metallic lustre which, no doubt, gave the fish a strange appearance. 



The typical B. euryops has been caught in the Atlantic off the North American 

 coast at different places about 39" 29' N. lat. — 40' 9' X. lat. and 71^46' — 67° 9' 

 W. long. There is thus a diiTerence in latitude of more than 88' between the 

 northern and southern locality and this may be sufficient to explain a racial dif- 

 ference. 



