ANTARCTIC FJSHES OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 265 



Islands, South Sandwich Islands, Marion Islands, Kerguelen, southern New Zealand, 

 and Chatham Islands. 



Although the interorbital region is relatively broader in the larger fish, its width, 

 compared with the length of the head, is an important specific character. By the 

 " interorbital width " is here understood the actual width of the osseous interorbital 

 space ; this is nearly always less, and when narrow proportionately much less, than the 

 interorbital width as measured by Boulenger. 



Syno2ysis of the Sjyecies. 

 I. Opercles fully scaled. 



A. Upper surface aud sides of head scaly, except snout and prasorbital ; inter- 

 orbital width ^ the length of head, or more. 



1. Upper lateral line of 62 to 65 tubular scales ; D VI, 32-34. A. 30-32. 



3 lateral lines . . . . ' 1- trigramma. 



2 lateral lines 2. canina. 



2. Upper lateral line of 40 to 55 tubular scales. D V-VII, 32-37. A 31-35. 



a. 21 to 25 gill-rakers on lower part of anterior arch. D VII (VIII), 



34-36. A. 32-34 3. ramsayi. 



h. 14 to 19 gill-rakers on lower part of anterior arch. 



a. Upper lateral line not or scarcely extending lieyond end of dorsal 



fin ; diameter of eye 4^ to 6 in length of head (in specimens up 



to 250 mm.). D VI-VII, 32-34. A. 31-34 4. tesselata. 



ft. Upper lateral line nearly reaching caudal fin. 



D VI-VII, 33-36. A 32-34. 16 to 19 gill-rakers on lower part of anterior 



arch. Eye 3| to 4| in length of head (in specimens of 125 to 250 mm.) 



5. tviltoni. 

 D V (VI), 35-37. A 32-35. 16 to 19 gill-rakers on lower part of anterior 

 arch. Eye 4 to 4.^ in length of head (in specimens of 90 to 180 mm.) 



6. brevicauda. 



D V-VI, 34-35. A 32-34. 14 or 15 gill-rakers on lower part of anterior arch. 



Eye 3 to 3| in length of head (in specimens of 130 to 180 mm.) 7. lo7}gipes. 



3. Upper lateral line of 30 to 35 tubular scales; D V-VI, 28-31. 



A 27-30. 8. sima. 



B. Upper surface and sides of head scaly, including prseorbital (and snout also 

 except in N. scotti). 



1. Interorbital width 6 in length of head ; D VI-VII, 32-33. A 35-36. 



9. lepidorhinus. 



2. Interorbital width 9 to 1 3 in length of head. 



D IV-V, 36-37. A 32 10. squamifrons. 



D VI, 37-39. A 38 11. kirseni. 



D V, 33. A 31 12. scofti. 



