NATURAL SCIENCES OF PHILADELPHIA. 519 



structure has not been mentioned. They must, therefore, for the present at 

 least, be retained in the same genus. 



The following analytical synopsis is chiefly intended to show the gradations 

 in the extension of the scales on the head : 



[. Anal rays 25 33, not exceeding those of soft dorsal. 

 la. Anal rays 2733. 

 A. Second dorsal with more rays than anal. Head 

 naked above. 

 a. Scales before or on sides of nuchal groove none. 

 Operculum above upper rib scaly ; scattered 

 scales before tipper angle of preoperculurn. 

 D. V. 3133. A. 2729. 

 Broad lateral band and narrow dorsal band yellow. .N. virgata. 



Bands none. Dorsal and anal uniform N. cornucola. 



Bands none. Dorsal and anal margined with 



lighter N. marginata. 



aa. Scales between nuchal and oculo-scapular 

 grooves. 

 b. Prenuchal scales in one oblique band on each 

 side. Operculum above superior rib scaly. 

 Scattered nearly uniserial scales below sub- 

 orbitals. D. V. 35 A. 28 N. coriiceps. 



bb. Prenuchal scales in two patches on each side. 

 Operculum above inferior rib with imbricated 

 scales, 

 c. Cheeks with loicerhalf naked. D. IV. 35, A. 31. .N. purpuriceps. 

 cc. Cheeks entirely scaly. Preopercular margin 



naked as usual. D. V. 35, A. 31 33. N. cyanobrancha. 



AA. Second dorsal and anal nearly equiradiate. Head 

 scaly above and between eyes. Operculum en- 

 tirely covered with imbricated scales. Cheeks 

 entirely scaly. (Naked along preopercular mar- 

 gin and behind maxillaries as in others.) 

 b. Scales above irregular or scattered. D. VI. 28, 



A. 28 N. sima. 



bb. Scales above imbricated. D. VI. 33 34, A. 33. .N. tessellata. 

 laa. Anal rays 25. D. V. 31 N. magellanicus. 



II. Anal rays 30 ; dorsal only (IV.) 25 N. pbocEe. 



III. Anal rays only 21 (D. V. 30 31.) N. macrocephalus. 



1. Notothenia virgata Richardson. 



Notothenia virgata Richardson, Ichthyology of the Erebus and Terror, p. 

 18, pi. xi., figs. 5, 6. 

 Habitat. Falkland Islands. 



2. Notothenia cornucola Richardson. 



Notothenia cornucola Richardson, Ichthyology of the Erebus and Terror, 

 p. 8, pi. viii., figs. 4, 5 ; ib. p. 18, pi. xi., figs. 3, 4. 

 Habitat. Falkland Islands. 



This species is closely allied to A r . virgata, and may be the same ; it still 

 more nearly resembles the following. 



3. Notothenia marginata Richardson. 



Notothenia marginata Rich., Ichthyology of the Erebus and Terror, p. 18, 

 pi. xii., figs. 1, 2. 

 Habitat. Falkland Islands. 



This may be identical with the former, and has been united to it by Dr. 

 Giinther ; it differs by the paler margins of the dorsal and anal fins. 



1861.] 



