CHAENICHTHYIDAE 69 



b. Three lateral lines; dorsal fins well separated; dorsal VIII-X, 29-31; anal 

 28-31 ; gill-rakers short, but well-developed ... 3. Pseudochaenichthys. 



2. Spinous dorsal of 3 spines; operculum with a single broad, flat spine; two lateral 



lines (upper and lower) 4. Dacodraco. 



B. Lateral line with bony plates; a rostral spine; dorsal VII-VIII, 30-34; anal 28-33; 

 dorsal fins separated by an interspace; two lateral lines (upper and middle). 



5. Chaenichthys. 

 II. Two outer soft rays of pelvic fin longest. 



A. Sub- and inter-operculum not spinate; rostral spine reduced or absent. 



1. Pelvic fins comparatively short, with the rays branched or bifid (except in young); 

 spinous dorsal of 7 or 8 spines, separated from soft dorsal by a short interspace; 

 two lateral lines 6. Chaenocephalus. 



2. Pelvic fins long, with the rays simple; spinous dorsal of 3 to 5 spines, separated 

 from soft dorsal by a long interspace; three lateral lines ... ... 7. Cryodraco. 



B. Sub- and inter-operculum bearing a pair of spines behind angle of praeoperculum; 

 rostral spine well-developed; three lateral lines. 



1. Pelvics I 5; gill-rakers reduced to a few vestiges near the angles of the arches. 



8. Chionodraco. 



2. Pelvics I 4; gill-rakers developed as dentigerous knobs or patches 9. Chaenodraco. 



Genus CHAMPSOCEPHALUS 



Champsocephaliis, Gill, 1862, Proc. Acad. N.S. Philad., (1861), p. 509; Regan, 1913, Trans. R. 

 Soc. Edinburgh, XLix, p. 285. Type Chaenichthys eso.x, Giinther. 



Body naked, elongate; two lateral lines (upper and middle), without bony plates. 

 No rostral spine ; eye nearly in middle of length of head. Jaws with rather narrow bands 

 of small, sharp teeth, forming only two series laterally ; lower jaw not projecting. Gill- 

 rakers short, but well developed on all the branchial arches, dentigerous; operculum 

 with 3 radiating ridges terminating in spinous points. Spinous dorsal well developed, 

 its base less than | that of the soft dorsal, with which it is almost continuous; pelvics 

 comparatively short, with the rays normally branched, the middle ones the longest. 



Two species, of which one occurs in the Antarctic Zone. 



Patagonian Region; South Georgia; Kerguelen. 



Champsocephalus gunnari, Lonnberg. 



Champsocephaliis gtinnari, Lonnberg, 1905, Wiss. Ergebn. Schwed. Siidpol.-Exped., v (6), p. 37; 

 1906, K. Svensk. Vet.-Akad. Handl., XL (5), p. 96; Regan, 1913, t.c, p. 285, pi. x, fig. 2; 

 Norman, 1937, Rep. B.A.N.Z. Antarct. Res. Exped., Ser. B, i, p. 65. 



St. 39. 25. iii. 26. Cumberland Bay, South Georgia. Large otter trawl, 179-235 m.: 14 specimens, 



235-275 mm. 



St. 42. I. iv. 26. Off mouth of Cumberland Bay, South Georgia. Large otter trawl, 120-204 m. : 

 2 specimens, 250, 325 mm. 



St. 45. 6. iv. 26. 2-7 miles S 85" E of Jason Light, South Georgia. Largeotter trawl, 270-238 m.: 

 2 specimens, 205, 258 mm. 



St. 123. 15. xii. 26. Off mouth of Cumberland Bay, South Georgia. Large otter trawl, 230- 

 250 m.: 5 specimens, 220-270 mm. 



