36 EINAR LÖNNBERG, (Schwed. Siidpolar-Exp. 



tion in marmorata to be, as a rule, 3, and in a ver)- old individual even 3-5, which 

 latter may be an exception. 



For further comparison the following table of comparative measurements has 

 been prepared from 6 specimens of N. maniioraia representing different stages of 

 growth. 



Total length without caudal in mm 72 



Length of head in % of total length . 



Interorbital width » » » > • 



Length of mandible . > » > » 



> » maxillary > » > » » 



Distance from snout to first dorsal » i> » » » 



> > 1 > anal > » » > > 



Length of ventral > » j , » 



Depth of caudal peduncle : :■ > > 



Diameter of eye s > » » > 



The direction of the development of some parts is made clear through this. 

 Most remarkable is the increase of the maxillary and mandible with age, indicating 

 that the larger specimens become even comparatively more rapacious. The distance 

 from snout to anal increases also gradually with age, while the distance from snout 

 to first dorsal is rather constant. The interorbital width increases, but the diameter 

 of eye decreases comparatively, as usually is the case. 



The upper lateral line has from 39 to 50 scales, the lower 14 to 17. 



The younger and smaller specimë'ns of this fish, which live in less depth, very 

 well deserve the name marmorata^ as they are marbled with darker on light ground. 

 Such marbled specimens may be seen with a length up to 24 cm. or somewhat more, 

 perhaps, and be caught in a depth from 4 to 30 m. But in a depth of 10 some of the 

 specimens are uniformly dark above, and in such a depth are found specimens which 

 have attained a much greater size, from 30 to more than 50 cm. It is, however, not 

 necessary that the large specimens lose their marbled colouration, as the very largest 

 one in this collection has retained it. On the other hand, a specimen from station 

 22 might be termed melanistic, as it is quite black above and on the sides of head 

 and body, in strong contrast to the whitish belly. The two smallest specimens 

 which measure with caudal about 6, resp. 9 cm. are labelled as having been "yel- 

 lowish brown on the back and upper parts in general, sides and belly bright silvery. 

 Iris bright silvery". 



9. Parachaenichthys georgianus (FISCHER). 



2 specimens, Boiler Harbour, South Georgia, depth 10 m., caught on hook and 

 line 1 8th of May 1902. 



