Bd. V: 6) THE FISHES OF THE SWEDISH SOUTH POLAR EXPEDITION. 7 



about 7 times in length of head. Snout a little longer than diameter of eye. Upper 

 lateral line with 45 — 46 tubular .scales, lower lateral line only with 5 — 6 tubular 

 scales, but in front of them may be counted a great number of pitted scales, on 

 one side 20. First dorsal basally somewhat connected with second. Longest ray 

 of former shorter than longest raj- of latter which is equal to half the length of 

 the head. Longest anal rays about Va of length of head. Pectoral rounded about 

 = 3 of length of head, reaching beyond origin of anal. Ventral about ^:'^ length of 

 head, reaching beyond origin of anal. Caudal very strongly rounded. Caudal 

 peduncle much deeper than long, so short that as well anal as especially second 

 dorsal when laid back reach beyond the same, its depth not even contained twice 

 in length of head. Anal and ventral fins as well as gill-membrane dusky. 



It is not agreeable to create a species of Nototlienia on a single specimen, but 

 it cannot be avoided in this case. N. brevicauda is very easily distinguished from 

 other species of this genus. In its general shape it perhaps resembles most N. 

 coriiceps RiCHARDSOX of such as I have seen myself, but differs widely from the 

 same in having occipital and interorbital regions as well as opercles and cheeks 

 densely scaly, a narrower interorbital region and much deeper caudal peduncle. 

 Similar characteristics distinguish N. brevicauda from N. cyanobrancha RICHARDSON 

 although the latter has scales on the cheeks but not on the interorbital and occi- 

 pital regions. N. karlandreœ (described below) has also some exterior resemblance 

 to this fish, but has a much smaller number of scales (about 46) and rays in second 

 dorsal (28 — 30) and anal (28) as well as a much more slender caudal peduncle, etc. 

 N. tessellata RICHARDSON has a greater number of rays in first dorsal, smaller 

 scales, narrower caudal peduncle. The slenderness of the caudal peduncle is also 

 a sharply distinguishing characteristic when N. brevipes (described below), xV. longi- 

 pes Steindachner, and N. marionensis Günther are compared with this fish so 

 that hardly any others are needed, although such exist, viz. in different numbers of 

 scales and fin rays, length of ventrals, shape of caudal, etc. N. elegans GÜNTHER 

 and N. nicolai BOULENGER are recognized by their naked interorbital region etc 

 The remaining species of the genus differ still more so that they need not to be 

 compared with tliis one. The following exact measurements shew the dimensions of 

 the single specimen. 



Total length without caudal 120 mm. 



Greatest depth of body 25 ' 



Depth of caudal peduncle 13 ' 



Length of head 34 



Interorbital width 4i8 > 



Diameter of eye 8.5 > 



Length of snout 10 > 



Length of ventral 25 > 



