Bd. V: 6) 
THE FISHES OF THE SWEDISH SOUTH POLAR EXPEDITION. 
6l 
Although this species from the beginning was found in the Antarctic Ocean it 
was very far from the present locality viz. on resp. 95 0 44' E. long, and 108° 35' 
E. long., thus almost on the opposite side in the Australian quadrant. When it 
now has been found to be numerous in the Atlantic quadrant, and a single find also 
is recorded from the Pacific quadrant it is by all this made most probable that 
M. antarcticum is a circumpolar species. 
3. Myctophum anderssoni 1 n. sp. 
2 specimens from 2,700 m. depth. 27th June 1902. 49° 56' S. lat. 49° 56' W. long. 
I specimen from the same locality but laid in a separate glass. 
D. 10 — ii. A. 18. 
This species belongs to the same group as M. antarcticum , arcticum and rissoi 
according to Aug. Brauer’s arrangement, 1 2 which is followed here, and his system 
for signifying the luminous organs is also accepted. 
Length of head in the largest specimen 3 3 / 4 times, in the smallest 4 times in 
total length without caudal. Greatest depth of body in the largest about 5, in the 
smallest 4V6 times in total length. Diameter of eye about 3 times in head. Length 
of snout in the largest about 5 times in head. Interorbital width about 8 times in 
head. Posterior end of maxillary broadened and reaching somewhat beyond the 
vertical through the posterior margin of the eye. The lens of the eye has a nor- 
mal central position. The distribution of the luminous organs is as follows (with 
Brauer’s terms): No luminous organ above the lateral line. PO. 5 in a horizontal 
series; VO. 4; no Pol.; AO. in one specimen 14, in two others 15, but the two 
foremost of these are situated a little higher up on the side than the others. Prc. 2, 
on the same level. PLO. and both PVO. sit in the same almost horizontal row 
below the level of the base of the pectoral (the PLO. sits rather close to the ante- 
rior PVO.) VLO. above and a little behind the base of the ventrals. The SAO. are 
unfortunately lost). 
The fact that the two foremost SO. are lifted up above the following series 
separates this species from its three nearest relatives quoted above. Fom M. ant- 
arcticum and M. rissoi with resp. 16—19 ar *d 10 — 12 AO. it is distinct by having- 
14 — 15 AO. From M. arcticum it is distinct by the normally placed central lens, 
which organ in M. arcticum is moved dorsad so that it is excentric in the eye. The 
arrangement of PLO. and PVO. is also characteristic. 
1 Named for the Zoologist of the Expedition Mr. K. A. Andersson. 
’ Vide Zool. Anzeiger Bd. XXVIII N:o io: “Die Gattung Myctophum." 
