GAMMARIDEAN AMPHIPODA 173 



9. Pleonal epimerou 3 lacking distinct posteroventral tootli . S. trux, new species 

 Pleonal epimeron 3 bearing distinct posteroventral tooth 10 



10. Tooth of pleonal epimeron 3 long and serrate . S. anaticauda K. H. Barnard 

 Tooth of pleonal epimeron 3 short and smooth 11 



11. Rostrum very long and downturned S. piisilla Enequist 



Rostrum medium in length and horizontal 12 



12. Pleonal epimeron 3 with posteriorly beveled ventral margin and very short 



posterior margin, lacking serrations, article 5 of pereopods 1 and 2 with 

 numerous posterior setae, article 5 of guathopod 2 elongated, article 2 of 



pereopod 5 broadly expanded ventrally S. dulcis, new species 



Plenal epimeron 3 with straight ventral margin and long posterior margin, 

 with 2 serrations, article i^ of pereopods 1 and 2 with few posterior setae, 

 article 5 of gnathopod 2 scarcely elongated, article 2 of pereopod 5 nar- 

 rowly expanded ventrally S. silox, new species 



Syrrhoites cohasseta, new species 



Figure 85 



Diagnosis of female. — Rostrum very slender, long, turned down- 

 ward strongly; lateral cephalic lobes scarcely projecting, truncate, 

 anteroventral corners rounded; antennae very slender but antenna 2 

 not elongated, articles 2 and 3 of antenna 1 peduncle each longer than 

 article 1, latter with small distomedial tooth, accessory flagellum biar- 

 ticulate, article 2 very short ; gnathopods slender, article 5 of gnathopod 

 2 unusually elongated ; anteroventral corner of coxa 1 rounded-quad- 

 rate, anterior edge concave, posteroventral corner of coxa 3 rounded- 

 quadrate, posterior margin scarcely excavate, coxa 4 with small blunt 

 posterodistal protrusion, ventral margin not strongly oblique; pereo- 

 pods 1 and 2 with long setae on article 5 and only one seta on posterior 

 edge of article 6 ; article 2 of pereopod 5 broadly expanded, posteroven- 

 tral corner quadrate, ventral edge horizontal and not extended down- 

 ward, posterior margin with coarse serrations; dorsal carina and teeth 

 commencing on pereonite 6, pereonites 6 and 7 and pleonites 1 and 5 

 with straight teeth, pleonites 2 and 3 with small reverted teeth, pleo- 

 nite 4 lacking tooth ; pleonite 4 with posteroventral tooth above inser- 

 tion of uropod 1 ; posteroventral corners of pleonal epimera 1 and 2 

 rounded-quadrate, ventral margin of epimeron 3 convex, not strongly 

 oblique, posteroventral corner with small, slightly upturned tooth, 

 posterior edge long and slightly convex ; epimera poorly setose ; pedun- 

 cle of uropod 1 with short lateral process, of uropod 2 with obsolescent 

 process; telson cleft about halfway. 



Male. — Badly damaged ; antenna 1 of typical male character, arti- 

 cles 1 and 2 subequal to each other in length, article 3 short, basal seg- 

 ments on flagellum coalesced and strongly setose posteriorly, accessory 

 flagellum large, 3-articulate, article 3 minute; antenna 2 long (broken). 



