ANTARCTIC FISHES OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 259 



Synopsis of the Species. 



I. Upper surface of head naked. 



A. Cheeks and opercles fully scaled. 



Interorbital width 3| to 5 in length of head. D VI-VIII, 32-38. 

 A 32-36 ........ 1. newnesii. 



Interorbital width 8 or 9 in length of head. D IV, 37. A 32-33. 



2. nicolai. 



B. Cheeks and opercles scaly above, naked below ; interorbital width 3 to 5| 



in length of head. 



D V-VI, 34-37. A 31-33 . . .3. horcligrevinkii. 



D IV- V, 30-33. A 29-30 .... 4. hrachysoma. 



II. Occiput scaly. 



A. Interorbital region naked, or not fully scaled. D IV-VI, 33-38. A 3 1-35. 



Diameter of eye 4f in length of head, interorbital width about 5 

 (in a specimen of about 270 mm.) ; 55 to 59 scales in a longi- 

 tudinal series . . . . . . . .5. vicarius. 



Diameter of eye 3 to 4^ in length of head, interorbital width 5 to 9 

 (in specimens up to 340 mm.); 60 to 75 scales in a longitudinal 

 series ........ 6. hernacchii. 



B. Interorbital region fully scaled; width 5 to 10 in length of head. 



D V-VII, 36-41. A 33-36 7. hansoni. 



D V-VI, 33-34. A 31-33 .... 8. loennbergii. 



( 1 ) Trematomus newnesii. 



Bouleng., "Southern Cross" Pisces, p. 177, pi. xi. (1902). 



Notothenia cyaneohrancha, Vaill., Exped. Antarct. Franr.aise, Poiss., p. 26 (1906). 



„ microlejndota, Vaill., t.c, p. 35. 



,, hoJgsoni, Bouleng., Nat. Antarctic Exped., Nat. Hist., ii.. Fish., p. 2, pi. i. fig. 2 (1907). 



Depth of body 4 to 5 1 in the length, length of head 3^ to 4^^. Diameter of eye 3 

 to 4;^ in the length of head, interorbital width 3| to 5. Maxillary extending to below 

 anterior part or middle of eye (young) or beyond (adult) ; upper surface of head naked, 

 cheeks and opercles scaly ; 15 to 20 gill-rakers on lower part of anterior arch. Dorsal 

 VI-VIII, 32-38. Anal 32-36. Pectoral | the length of head or more, longer than 

 pelvics, which reach the vent in the young, but not in the adult. Caudal truncate. 

 Caudal peduncle about as long as deep. 68 to 86 scales in a longitudinal series from 

 above base of pectoral fin to caudal, 40 to 52 in upper lateral line, which ends below 

 posterior rays of dorsal, 3 to 19 in lower lateral line. Brownish, usually spotted or 

 marbled or with irregular cross-bars ; spinous dorsal blackish ; other fins dusky, often 

 with small dark spots. 



Here described from a large series of specimens, 50 to 200 mm. in total length, in- 

 cluding the types of the species and of N. hodgsoni. The types came from Duke of 



