370 MR C. TATE REGAN ON THE 



Chaenocephalus aceratus. (PL XL) 



Chxnichthys aceratus, Ldnnberg, Kungl. Svensk. Vet.-Akad. Handl., xl., 1906, No. 5, p. 97. 



Depth of body 5 to 6 in the length, length of head 2 to 2|, Snout a little less 

 than | the length of head. Diameter of eye 5 to 6 in the length of head, interorbital 

 width about 5. Supraorbital edges raised ; operculum with 3 radiating ridges ending 

 in spines, the uppermost bifid. Maxillary extending to below middle of eye or beyond. 

 Dorsal VII-VIII, 39-40 ; third spine longest, J to more than f the length of head. 

 Anal 37-38. Pectoral and pelvic fins subequal in length, nearly | the length of head. 

 Greyish, with 4 or 5 dark cross bands, the first from spinous dorsal through base of 

 pectoral, the second downwards' from origin of soft dorsal, the others less regular and 

 sometimes with narrower bars developed between them. 



South Georgia. 



Four specimens, 480 to 530 mm. in total length, collected by Mr DAVID FERGUSON, 

 and presented to the Scottish Oceanographical Laboratory by Messrs SALVESEN. 



6. Chionodraco, Lonnberg, 1906. 

 Kungl. Svensk. Vet.-Akad. Handl., xl., No. 5, p. 99. 



Apparently intermediate between Chssnocephalus and Cryodraco, resembling the 

 former in fin-structure, the latter in the three lateral lines and the well-developed 

 rostral spine. 



Graham Land. 



Chionodraco hamatus. 



Cheenichthys rhinoceratus subsp. hamatus, Lonnberg, Swedish South Polar Exped., Fish., p. 47 (1905). 

 Chionodraco hamatus, Lonnberg, Kungl. Svensk. Vet.-Akad. Handl., xl., 1906, No. 5, p. 99. 



Head 3 in total length (with caudal). Snout nearly ^ length of head, nearly twice 

 diameter of eye, and 1^ interorbital width. Dorsal VIL, 37. Anal 33. 

 Snow Hill. 

 Total length 330 mm. 



7. Cryodraco, Dollo, 1900.* 

 Bull. Acad. Roy. Belg. Sciences, p. 129. 



Differs from Chsenocephcdus especially in the structure of the pelvic fins, with the 

 rays simple, the two outer enlarged and prolonged, and in the presence of an additional 

 lateral line at the base of the anal fin. 

 Graham Land ; Wilhelm Land. 



(1) Cryodraco antarcticus. 



Dollo, i.e., p. 130, and Res. Voy. " Belgica," Poiss., p. 20, pi. i. pi. v. fig. 7 (1904). 

 Depth of body 8 in the length, length of head 3^. Snout 2, eye 4, interorbital width 

 5 in the length of head. Dorsal III, 44. Anal 43. Pelvic fin more than the length 



* A fish from Wilhelm Land, 69 mm. long, is recorded by PAFPENHEIM under the name Pagetodes antarcticus. The 

 number of fin-rays (D IV, 31. A 31) scarcely justifies this determination, and the fish may well belong to an undescribed 

 species. But as it is so juvenile and even its generic position uncertain, I refrain from giving it a specific name, 



(ROY. soc. EDIN. TRANS., VOL. XLIX., 288.) 



