g8 discovery reports 



ZOARCIDAE 



In 1908, Lahille (Anal. Mus. Nac. B. Aires, xvi, p. 403) published an account of the 



genera and species found on the coast of Argentina, but, as his paper was omitted from 



the Zoological Record, it was overlooked by Regan when he prepared a revision of the 



South American and Antarctic Zoarcidae in 1913 (Trans. R. Soc. Edinb., xlix, p. 241). 



In view of the very extensive material obtained by the Discovery Expedition, it has 



seemed desirable to prepare a new revision of the species from the Patagonian region, 



leaving those of South Georgia and the Antarctic to be dealt with in the next part of 



this report. 



Key to the Patagonian genera 

 I. Pelvic fins present. 



A. Snout and lower jaw without fringes. 



1 . Origin of dorsal fin well behind base of pectoral ; gill-opening cleft downward nearly 



to lower end of base of pectoral; eye large, 3^ in head ... Ophthalmolycus. 



2. Origin of dorsal fin above base or anterior part of pectoral; eye smaller, more than 

 3! in head (except in young). 



a. Gill-opening cleft downward at least to middle of base of pectoral. 



(i) Gill-opening cleft downward almost or quite to lower end of base of pectoral; 



head not depressed ; canine teeth usually present, at least in lower jaw Iluocoetes. 

 (ii) Gill-opening cleft downward only to middle of base of pectoral ; head more 



or less depressed; no canine teeth ... ... ... ... Austrolycus. 



b. Gill-opening small, above the pectoral; head not depressed ... Phucocoetes. 



B. Snout and lower jaw with dermal fringes. 



1. Teeth conical, in 2 or more series in both jaws; small scales embedded in the skin. 



a. Gill-opening almost entirely above the pectoral; palate toothless Crossostomus. 



b. Gill-opening cleft downward to middle of base of pectoral; teeth on palate 



POGONOLYCUS. 



2. Teeth incisor-like, uniserial ; palate toothless ; skin naked ; gill-opening cleft downward 



to middle of base of pectoral ... ... ... ... ... ••• ••• Plate a. 



II. No pelvic fins. 



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



B. Gill-opening above base of pectoral Melanostigma. 



Genus Ophthalmolycus, Regan 

 1913, Trans. R. Soc. Edinb., xlix, p. 243. Type Lycodes macrops, Giinther. 

 Form elongate, compressed. Mouth subterminal ; teeth rather slender and acute, in 

 about 3 series in both jaws; no canines; 3 teeth on vomer and 2 near anterior end of 

 each palatine. Gill-opening rather wide, cleft downward nearly to lower end of base 

 of pectoral. Dorsal origin well behind head ; pelvic fins present. 



Ophthalmolycus macrops (Giinther). 



Lycodes macrops, Giinther, 1880, Shore Fish. 'Challenger' , p. 21, pi. xi, fig. B. 

 Ophthalmolycus macrops, Regan, 191 3, t.c, p. 243. 



Depth of body 1 1 1 in the length, length of head 5^. Diameter of eye 3^ in length 

 of head and 7 times interorbital width. Maxillary nearly reaching vertical from posterior 



