NO. 3 BARNARD : THE PHOXOCEPHALIDAE 319 



Key to the Genus Heterophoxus 



1. Third pleonal epimeron with long tooth 2 



1. Third pleonal epimeron with short tooth. videns 



2. Article 2 of peraeopod 5 reaches halfway along article 4 3 



2. Article 2 of peraeopod 5 reaches to the end of article ^....ophthalmicus 



3. Article 4 of peraeopod 5 stout, lobed on hind margin trichosus 



3. Article 4 of peraeopod 5 slender, not lobed oculatus 



Heterophoxus videns K. H. Barnard 



Heterophoxus videns K. H. Barnard 1930: 334-335, fig. 11; Schellen- 



berg 1931: 74-75, figs. 37b, 38; K. H. Barnard 1932: 100; Schel- 



lenberg 1935: 232; Nicholls 1938: 46, fig. 24. 



Diaffnosis. — Third pleonal epimeron with a short tooth; peraeopod 

 5, article 2 reaching to end of article 4, teeth on posterior edge rounded, 

 not acute (but see below). 



Remarks. — I have removed from the synonymy of this species the 

 specimens identified as Harpinia obtusifrons by Walker 1907, Chilton 

 1909 and 1912, referred to by K. H. Barnard 1932, for they could be 

 one of several other species, especially Proharpinia hurleyi J. L. Barnard. 

 However, I have examined a series of 6 slides representing 2 dissected 

 specimens identified by Dr. Chilton as H. obtusifrons and deposited in 

 Canterbury University Museum (courtesy of Prof. E. Percival). The 

 slides were labeled N-l to N-3 and X-l to X-3, penciled respectively 

 166-13-14-15 and 162-1-2-3, from McMurdo Bay, "Nimrod" Expe- 

 dition. Pleon segment 3 was not extant but the ensiform process of 

 antenna 2 and peraeopod 5 corresponded to H. videns except for the 

 sharp teeth. Other specimens of Chilton were P. hurleyi (see J. L. 

 Barnard 1958). 



The H. obtusifrons of Stephensen 1927 has been referred by J. L. 

 Barnard 1958 to P. hurleyi. 



Distribution. — (restricted): Antarctica at McMurdo Sound; off 

 Cape Adare; Commonwealth Bay. South Shetlands; South Georgia; 

 Falkland Islands; South America, numerous localities throughout the 

 Magellan-Fuego Archipelago and as far north as Valparaiso. 



