66 DISCOVERY REPORTS 



Hab. Graham Land and neighbouring islands. 



The type of this species consists of a head, 145 mm. in length (measured to tips of 

 opercular spines), and a portion of the tail-end of the body, the latter very poorly 

 preserved, in the Paris Museum (No. 06 — 144). As the jaws and opercles of this 

 specimen are fully expanded, as shown in Vaillant's figure, the general appearance of 

 the head appears at first sight unlike that of a Parachaenichthys. I have carefully 

 examined the type, however, and have little doubt that it belongs to the same species 

 as the much smaller fish obtained by the ' Discovery II '. The type is from Booth Wandel 

 Island, at a depth of 30 metres. 



Genus PSILODRACO 



Psilodraco, Norman, 1937, Ann. Mag. Nat. Hist., (10) xx, p. 475. Type Psilodraco breviceps, 

 Norman. 



Body naked, subcylindrical anteriorly, compressed posteriorly; three lateral lines, 

 consisting of series of imperforate scales more or less embedded in the skin. Head 

 not much depressed; snout not produced, bluntly pointed; mouth moderately pro- 

 tractile; a band of villiform teeth in the upper jaw; each praemaxillary with a group 

 of canine teeth anteriorly; teeth in lower jaw in several rows anteriorly, becoming 

 uniserial laterally. Gill-membranes forming a fold across the isthmus; 6 branchio- 

 stegals ; gill-rakers reduced to a few vestiges near the angles of the arches ; operculum 

 with a fairly strong spine with a hooked branch; suboperculum without spine. No 

 spinous dorsal fin. Pelvic fins short, with the middle rays longest. Vertebrae 48 

 (16 + 32). 



A single species. 



South Georgia. 



This genus is clearly related to Gymnodraco, and examination of a skeleton prepared 

 for me by Mr W. R. Sherrin reveals no important osteological differences. Psilodraco 

 differs from Gymnodraco mainly in the shape of the head and body, the form of the 

 jaws and teeth, and in the presence of three lateral lines. 



Psilodraco breviceps, Norman. 



Psilodraco breviceps, Norman, 1937, t.c, p. 476. 



St. MS 68. 2. iii. 26. East Cumberland Bay, South Georgia. Large rectangular net, 220-247 i"-- 

 I specimen, 128 mm. 



St. MS 71. 9. iii. 26. East Cumberland Bay, South Georgia. Small beam trawl, 110-60 m.: 

 I specimen, 36 mm. 



St. 39. 25. iii. 26. East Cumberland Bay, South Georgia. Large otter trawl, 179-235 m.: 22 

 specimens, 36-195 mm. (holotype, 190 mm.). 



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

 12 specimens, 48-137 mm. 



St. 45. 6. iv. 26. 27 miles S 85° E of Jason Light, South Georgia. Large otter trawl, 238- 

 270 m.: 22 specimens, 90—180 mm. 



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

 250 m. : 6 specimens, 70-115 mm. 



