5° 



DISCOVERY REPORTS 



Length of head 4I (young) to 6 in the total length. Snout as long as or a little shorter 

 (a little longer in large examples) than eye, diameter of which is 3^ (young) to 4 in 

 length of head ; interorbital width about 5. Maxillary extending to below posterior edge 

 of pupil; lower jaw projecting, length about ii in that of head; teeth in lower jaw 

 stronger than those in upper, 7 to 9 on each side ; vomerine teeth present. Gill-rakers 

 slender, the longest about \ as long as eye, 22 to 25 on lower part of anterior arch. 

 First dorsal with 12 rays, narrowly separated from the second, which has about 98 rays. 

 Anal with about 95 rays, its origin \\ to \\ times as distant from end of tail as from 

 tip of snout. Pectoral with 17 to 19 rays, length i\ to if in that of head. Pelvic with 

 8 rays, length if to twice in that of head. 



Hab. Coasts of Argentina, northwards to Buenos Aires; Patagonian-Falklands 

 region ; Straits of Magellan. 



This species is very close to M. novae-zelandiae (Hector), from New Zealand and 

 Tasmania, 1 but the latter has a distinctly larger eye, which is 3 J (young) to 3! in length 

 of head. In addition, the interorbital width is 4§ to 4I, the lower jaw if to nearly if in 

 length of head, the maxillary extends to below the middle of the pupil, and the length 

 of the pectoral is 1^ to about ih in that of head. 



Fig. 2 1 . Macruronus magellanicus. x -J-. 



Mr E. R. Gunther notes that in life this fish is a pale lustrous blue on the sides, 

 becoming more intense on the back where the tones are sapphire and turquoise, and 

 silvery white beneath. 



GADIDAE 

 Key to the genera of southern South America 



I. Three dorsal and two anal fins Micromesistius. 



II. Two dorsal and one anal fin. 



A. Pelvic fin with flat base and 4 to 9 rays, never much longer than head. 



1. Teeth in villiform bands, those of outer row not enlarged. 



a. Vomerine teeth present ... ... ... ... ... ... ... Salilota. 



b. No vomerine teeth Physiculus. 



2. Teeth in villiform bands, those of the outer row in both jaws enlarged; no vomerine 

 teeth Lotella. 



1 A good description of this species has been given by Waite (191 1, Rec. Canterbury Mus., 1, p. 180, 

 pi. xxx, fig. 1). 



