CHAENICHTHYIDAE 75 



Hab. Kerguelen. 



The type of the species, 450 mm. in total length, was taken in the kelp close to the 

 shore, the fish being caught with the hook. In addition to this specimen, and a smaller 

 one (175mm.) collected by the 'Challenger', several examples (300 to 510mm.) 

 collected by the B.A.N. Z. Antarctic Research Expedition are included in the above 

 description. 



Chaenichthys rugosus, Regan. 



Chaenichthys rhinoceratiis (part), Giinther, i860, t.c, p. 249. 



Chaenichthys rhinoceratiis (non Richardson), Giinther, 1879, Phil. Trans. R. Soc. London, 



CLXVin (extra vol.), p. 166. 

 Chaenichthys rugosus, Regan, 1913, t.c, p. 287; Norman, 1937, t.c, p. 66. 



Very closely related to C. rhinoceratus, but diameter of eye y^ to 8 in length of head ; 

 maxillary extending to or nearly to below middle of eye. Head rougher and supra- 

 orbital edges more elevated. 62 or 63 plates in upper lateral line; a nearly continuous 

 series of plates on middle of side. Dorsal VIII, 30-31 ; third and fourth spines longest, 

 fifth about as long as first. Anal 28-29. Pectoral with 18 rays, scarcely extending to 

 above vent ; pelvics longer. Nearly uniformly brownish. 



Hab. Kerguelen. 



The type of the species, 400 mm. in total length, has the head and body much 

 distorted. The B.A.N.Z. Antarctic Research Expedition obtained a second example, 

 245 mm. in total length, which has been included in the above description. A stuffed 

 specimen in the British Museum collection may also belong to this species. 



Genus CHAENOCEPHALUS 

 Chaenocephalus, Regan, 1913, t.c, p. 287. Type Chaenichthys aceratus, Lonnberg. 



Body naked, elongate; two lateral lines, without distinct bony plates. A small 

 prominence at anterior end of ethmoid ; eye somewhat behind middle of head. Jaws 

 with small sharp teeth forming rather broad bands, there being several series even at 

 the sides; lower jaw not projecting; gill-rakers absent except for 3 or 4 very short 

 ones below the angle of the first arch ; operculum with 3 or 4 radiating ridges ending in 

 spines, the uppermost with two or more points. Spinous dorsal well developed, its 

 base about \ that of the soft dorsal, from which it is separated by an interspace; pelvics 

 comparatively short, with the two outer rays the longest, enveloped in thick skin, but 

 bifid, the others normally branched. 



A single species. 



Palmer Archipelago ; South Orkneys ; South Georgia. 



Chaenocephalus aceratus (Lonnberg). 



Chaenichthys aceratus, Lonnberg, 1906, K. Svensk. Vet.-Akad. Handl., xl (5), p. 97. 

 Chaenocephalus aceratus, Regan, 1913, t.c, p. 288, pi. xi. 



St. MS 68. 3. ii. 26. East Cumberland Bay, South Georgia. Large rectangular net, 220-247 m. : 

 I specimen, 515 mm. 



