NO. 5 BARNARD: AMPHIPODA 61 



Family ARGISSIDAE 



Argissa hamatipes (Norman) 

 Argissa hamatipes (Norman). — Stebbing 1906: 277; Shoemaker 1930: 



37-40, figs. 15-16; Stephensen 1931a: 261; Stephensen 1935: 140; 



Stephensen 1940: 41; Stephensen 1944: 52; Gurjanova 1951: 327- 



328, fig. 193; J. L. Barnard 1962c: 151 ; Gurjanova 1962: 392-393. 

 Argissa typica Boeck. — Sars 1895 : 141-142, pi. 48. 



Canyon material : 6819(1). 



Family ATYLIDAE 



Atylus tridens (Alderman) 



(Fig. 9) 

 Nototropis tridens Alderman 1936: 58-59, figs. 20-25. 



Atylus tridens Mills 1961 : 26-32, figs. 3, 4C. 



Canyon material: 7043 ( 1 ) . 



Relationship: This small specimen fits Atylus serratus (Schellen- 

 berg 1925) in Mills' (1961) key because the metasomal carinae are 

 obsolete. It differs from A. serratus in various minor characteristics, 

 such as the longer rostrum, the spination and setation of the appendages, 

 the absence of a process on article 2 of pereopod 4, but especially in 

 the very short fifth articles of pereopods 3-5 which are elongated in 

 A. serratus. Atylus tridens differs from A. swammerdami (see Sars 

 1895: pi. 163) in these same vrays. From A. minikoi (Walker 1905), 

 A. tridens differs in the slightly produced posterodistal corner of ar- 

 ticle 2 on pereopod 3 (note damage on one side of animal), but espe- 

 cially in the absence of dorsal notches on urosomites 4 and 5-6 (fused). 

 I am confused by Pillai's (1957) redescription of A. minikoi for it dif- 

 fers in many ways from the animal described by Walker ( 1905) . 



Family COROPHIIDAE 



Ericthonius brasiliensis (Dana) 

 Ericthonius brasiliensis (Dana). — Stebbing 1906: 671-672; J. L. Bar- 

 nard 1955a: 37-38 (with references) ; Pillai 1957: 60, fig. 16, 3-7; 

 J. L. Barnard 1959c : 39 ; J. L. Barnard 1961a : 183. 

 Canyon material: 4851 ( 1 ) , 4852 (4) , 6803 ( 1 ) . 



Ericthonius ?difformis Milne Edwards 

 (Fig. 10) 

 Ericthonius dijformis Milne Edwards.— Sars 1895: 604-605, pi. 216, 

 fig. 1; Stebbing 1906: 672-673; Chevreux and Fage 1925: 354, 



