GAMMARIDEAN AMPHIPODA 175 



article 5 much longer than 4 ; uropods stouter than m female ; telson 

 cleft halfway ; pleonal epimeron 3 much deeper than hi female, with 

 long, oblique posterior edge below a medial quadrate cusp; tooth of 

 pleonite 4 much longer than in female, pleonite 6 with vertically 

 directed hump; pereopods in poor condition but article 2 of pereopod 

 5 apparently much broader than in female and not serrate posteriorly. 



Remarks. — Female specimens generally badly damaged ; telson and 

 uropods reasonably well reconstructed but perhaps inaccurately illus- 

 trated; uropods 1 and 2 like those of male but more slender, outer 

 ramus slightly longer on uropod 1 and peduncular process longer, outer 

 rami uniarticulate; uropod 3 as slender as that of Syrrhoites serrata 

 (Sars) with rami interequal in length and equal to peduncle, outer 

 ramus apparently uniarticulate; maxillae 1 and 2 like those of S. 

 serrata] mandible, lower lip and maxilliped generally like those of S. 

 seiTata but with small differences figured herein. 



HoLOTYrE. — AHF No. 6020, female, 3.4 mm. 



Type-locality.— Station 7229, 27°54'25" N, 115°40'00" W, 1720- 

 1748 m, Dec. 31, 1960. 



Material. — Stations 7229 (3 females) , 7358 (1 male) . 



Relationship. — This species closely resembles Syrrhoites pus'dla 

 Enequist (1950) in its dorsal sculpture, rostrum, telson, and, in general, 

 its uropods. Pereopods 1 and 2 of S. coltasseta have more setae on 

 article 5 than on article 6. Mouthparts of S. cohasseta and -6'. 'pusilla 

 are similar except for the longer articles 1 and 3 of the mandibular 

 palp in S. cohasseta. The new species further differs from S. fusilla 

 in the elongated article 3 of antenna 1 (female) , by the elongated arti- 

 cle 5 of gnathopod 2, the lack of a small, sharp projection on the first 

 and second pleonal epimera, the more regular shape of pleonal epi- 

 meron 3 in both sexes, by the presence of lateral peduncular processes 

 on uropod 1 and the longer fifth article of male antenna 2. 



The long second gnathopod of S. cohasseta resembles that of S. 

 terceris J. L. Barnard (1964b) but the shape of pleonal epimera 2 and 

 3, the more slender uropods and the elongated article 3 of female an- 

 tenna 1 are characteristic of S. cohasseta. 



The elongated article 3 of antenna 1 in S. cohasseta resembles that 

 of S. walkeri Bonnier (1896) but the latter has a stout rostrum and 

 very large teeth on pleonites 1-5. Males and females of S. cohasseta 



Figure 85. — Syrrhoites cohasseta, new species, holotypc, female, 3.4 mm, 7229: a, lateral 

 aspect; b~e, pereopods 1,3,4,5, some broken; /,g, uropods 1,2, broken; h, gnathopod 1; 

 i, antenna 2; ;', lower lip; k,l, mandibles; m, maxillipedal outer plate and palp; n, distal 

 cusp of article 1 of antenna 1; o, antenna 1; p, gnathopod 2. Male, 5.5 mm, 7358: 

 q, telson; r, uropod 3, broken; s, head; t, mandibular palp; u, antenna 1; v, pleonites 3-6, 

 left to right; zv, antenna 2; x, part of pereopod 5. 

 242-332— G7 13 



