324 MR C. TATE REGAN ON THE 



Teeth on vomer and palatines . . . . 3. Iluocostes. 



Palate toothless 4. Lycodichihys. 



b. Mouth moderate, with short lateral cleft ; teeth in jaws 

 uniserial laterally, usually bi- or tri-serial anteriorly ; no 

 well marked canines; teeth on palate. 



Head not depressed ; gill-opening cleft downward nearly to lower end of 

 base of pectoral ...... 5. Austrolydchthys. 



Head depressed ; gill-opening cleft downward only to middle of base of 

 pectoral ......... 6. Austrolycus. 



3. Origin of dorsal fin above base of pectoral ; gill-opening small, 

 above the pectoral ; teeth in upper jaw uniserial, in lower bi- 

 or tri-serial ; teeth on palate . . .7. Phucoccetes. 

 B. Snout and lower jaw with dermal fringes ; palate toothless. 



Teeth conical, bi- or tri-serial ; gill-opening almost, entirely above the 

 pectoral . . . . . . . . .8. Crossolycus. 



Teeth incisor-like, uniserial ; gill-opening cleft downward to middle of 

 base of pectoral . . . . . . . .9. Platea. 



11. No pelvic fins ; mouth terminal ; origin of dorsal just behind head ; teeth 



uuiserial, in jaws and on vomer and palatines. 



Gill-opening cleft downward to middle of base of pectoral . 10. Maynea. 

 Gill opening above base of pectoral . . . .11. Melanostigma . 



1. Lyccnchelys, Gill, 1884. 

 Proc. Acad. Philad., p. 110. 



Form elongate, with the tail long and slender ; mouth subterminal ; teeth in jaws 

 slender, uui- or bi-serial ; teeth on vomer ; palatine teeth uuiserial. Gill-opening rather 

 wide, cleft downwards to lower end of base of pectoral. Dorsal origin well behind head ; 

 pelvic fins present. 



Lycenchelys antarcticus, sp. n. (PI. IX. fig. 3.) 



Depth of body 16 in the length, length of head 6 and equal to its distance from 

 origin of anal fin. Head as broad as deep, its breadth a little more than ^ its length. 

 Snout twice as long as diameter of eye, which is 6 in length of head ; interorbital 

 width about 16. Muciferous channels of sides of head and lower jaw with large pores. 

 Lower jaw included ; teeth in jaws rather slender and obtuse, uniserial, biserial near 

 symphysis of lower jaw; teeth on palate acute, wide-set. About 110 rays in dorsal 

 fin, 9 in caudal, 103 in anal ; origin of anal ^ as distant from vertical through origin 

 of dorsal as from that through base of pectoral, which fin is a little more than ^ as long 

 as head. Bluish grey ; head darker ; fins brownish grey. 



A single specimen, 128 mm. in total length, from near the South Orkneys, Station 



(ROY. soc. EDIK. TRANS., VOL. XLIX., 242.) 



