66 EINAR LÖNNBERG, (Schwed. Südpolar-Exp. 



a little more than half way to vent. Distance from snout to origin of dorsal equal 

 to distance from snout to ventrals. No adipose fin below in front of vent. Dorsal 

 adipose fin beginning opposite tenth anal ray. Barbel a little longer than head, 

 with an unpigmented, somewhat clubshaped, luminous organ at the extreme end. 

 35 pairs of luminous spots from the anterior part of the isthmus to the ventrals, 

 i6 pairs from the ventrals to the vent and 3 more on either side of the anal, but 

 whether the series is continued still further, cannot be discerned on the present spe- 

 cimen. The latero-ventral row contains probably according to an approximate esti- 

 mation about 56 luminous spots, but only the 42 anterior ones of those are con- 

 spicuous on the present specimen, extending from the opercle to opposite the seventh 

 anal ray. There has also been luminous spots on the head (on the opercle and 

 above the upper jaw), but nothing can be said about them. Skin black with small 

 white spots. 



Dimensions: 



Total length without caudal 188 mm. 



Length of head 37 • 



Greatest depth of body 33 » 



Depth of body at beginning of dorsal 29 » 



Least depth of caudal peduncle 10 > 



Distance from snout to dorsal fin 100 » 



1 » ' ventrals 100 > 



> > beginning of dorsal to root of caudal 87 > 



> 5 > anal > » > » 42 > 



Base of dorsal 18 > 



Postorbital length of he'ad 23 > 



Diameter of eye 6.5 > 



Length of snout 10 



Length of barbel 42 > 



With regard to the number of fin-rays this new species resembles A. richard- 

 sotiii Poky from the Cuban waters but differs from the same through some relative 

 dimensions. A. aiifarcticus is not so slender, so that, for instance, its height at the 

 dorsal is more than the postorbital length ot the head. It has a longer snout which 

 is as may be seen from the measurements above a good deal longer than the dia- 

 meter of the eye, while it is only two thirds the length of the eye in A. richard- 

 sonii. The distance from the anal origin to the root of caudal equals in the latter 

 the length of the head, but in the new species the former measurement is longer. 

 A. niger RICHARDSON, A. gcmmifcr GOODE & Bean, A. barbatus K\ER and A. 

 indiens Brauer have a much larger number of dorsal rays (16 — 17) and dift'er also 

 in other respects. A. boiilcngeri GiLCllRlST * has 16 dorsal rays and ventral adipose 



* Marine Investigations in South Africa Vol. II. Cape Town 1904. 



