348 MR C. TATE REGAN ON THE 



C. Upper surface and sides of head scaly (except in N~. nudifrons) ; praeorbital 

 naked ; interorbital width ^ the length of head, or less. 



1. Lower lateral line of 32 to 41 tubular scales; D V1I-V1II, 31-33. 

 A 3 1-33 13. yibberifrons. 



2. Lower lateral line of 15 to 18 tubular scales ; D VI-VII, 28-30. A 28-31. 



14. acuta. 



3. Lower lateral line without tubular scales. 



Upper surface of head scaly. D VII, 32. A 32 . . .15. vaillanti. 



Upper surface of head scaly. D IV-V, 35-37. A 33-35 . . 16. mizops. 



Upper surface of head naked. D IV-VI, 37-39. A 34-36 . 17. nudifrons. 



II. Opercles scaly above, naked below ; upper surface of head scaly. 



Interorbital width 10 in length of head. D VII, 29. A 27 18. marionen.ns. 

 Interorbital width 20 in length of head. D V-VI, 29-30. A 30-31. 



19. angustifrons. 



III. Opercles scaled only on upper part of operculum ; upper surface of head naked. 



A. Anal of 27-33 rays. 



a. Interorbital width 12 in length of head. D VI, 33. A 31. 



20. elegans. 



l>. Interorbital width 4 to 7 in length of head. 



Cheek usually scaly behind eye. D IV-VI, 31-34. A 27-31 21. cornucola. 

 Cheek scaly below and behind eye, its lower \ (young) or \ (adult) naked. 



D IV-VI, 33-36. A 30-33 22. cyaneobrancha. 



Cheek scaly behind eye. D III-VII, 35-41. A 27-31 . 23. coriiceps. 



c. Interorbital width 3} in length of head. D VI-VII, 33-35. A 27-29. 



24. rossii. 



B. Anal of 22 to 25 rays ; interorbital width 2| to 4| in length of head. 

 D IV, 29-31. 48 to 56 scales in a lateral longitudinal series. 



25. macrocephala. 

 D VI-VII, 28-29. 52 to 58 scales in a lateral longitudinal series. 



26. microlepidota. 

 D VI-VIII, 26-27. 84 to 92 scales in a lateral longitudinal series 27. colbecki. 



C. Anal of 18 to 20 rays ; interorbital width about 4 in length of head. 



28. filholi. 



(1) Notothenia trigramma, sp. n. (PI. VI. fig. 2.) 



Depth of body 5 in the length, length of head 4. Diameter of eye 5 in the length 

 of head and equal to the interorbital width. Lower jaw projecting ; maxillary 

 extending to below anterior ^ of eye ; upper surface of head, except snout, cheeks and 

 opercles scaly ; 15 gill-rakers on lower part of anterior arch. Dorsal VI, 34. Anal 32. 

 Pectoral longer than pelvics, f as long as head, extending to above anal. Caudal 

 rounded. About 85 scales in a lateral longitudinal series, 65 in upper lateral line, 



(ROY. soc. EDIN. TBANS., VOL. XLIX., 266.) 



