GAMMARIDEAN AMPHIPODA 183 



lateral process of pleonite 4, the elongation of pereopods 3-5 and the 

 shapes of article 2 on pereopod 5 also demonstrate the relationship 

 of this male to the female of /S. redox and not to that of /S. nilex. 



Article 2 on tlie outer ramus of uropod o was not observed in pris- 

 tine condition in the two individuals of this species and is restored 

 in the drawings. 



Syrrhoites silex, new species 



Figure 89 



Diagnosis of female. — Rostrum of medium length, slender, nearly 

 horizontal; lateral cephalic lobe broadly rounded, poorly projecting, 

 smooth, anteroventral corner rounded; antennae of medium thick- 

 ness, antenna 2 not elongate, article 2 of antenna 1 longer than article 

 1, article 3 slightly shorter than article 1, mediodistal end of article 1 

 with complex cuspidation; accessory flagellum biarticulate, article 2 

 very short; giiathopods of medium thickness, article 5 of gnathopod 

 2 scarcely elongated; anteroventral corner of coxa 1 rounded-quadrate, 

 anterior margin scarcely excavate, posteroventral corner of coxa 3 

 rounded-quadrate, posterior margin scarcely excavate, coxa 4 with 

 very oblique ventral (seemingly posterior) margin, posteroventral 

 corner scarcely protruding, rounded-quadrate; pereopods 1 and 2 

 with very few posterior setae on articles 5 and 6 ; article 2 of pereopod 

 5 poorly expanded for genus, tapering distally, posteroventral corner 

 quadrate-subacute, extended nearly to end of article 3, ventral margin 

 slightly oblique and short, posterior edge with fine serrations; dorsal 

 carina moderately weak, commencing about on pereonite 2, pereonites 

 5-7 and pleonites 1 and 2 with distinct posteriorly directed, blunt pos- 

 terodorsal teeth, pleonite 3 with retrorse, acute dorsal tooth, pleonite 

 4 with elevated but weak quadrate tooth, pleonite 5 with short, thick 

 tooth; pleonite 4 with posterolateral, acutely upturned, thick tooth; 

 posteroventral comer of pleonal epimeron 1 roimded, of epimeron 2 

 with sinuous posterior margin and short, broad, acute posteroventral 

 tooth, of epimeron 3 with small, narrow, sharp tooth, above which 

 posterior margin straight and furnished with two large serrations 

 nearly as large as posteroventral tooth; only epimeron 2 with four 

 conspicuous spines; peduncle of uropod 1 with medium-sized lateral 

 process, of uropod 1 witli small process; telson cleft nearly two thirds 

 of its length. 



jMale. — An immature male has basal flagellar article of antenna 

 1 elongated slightly as seen in the accompanying figure. 



HoLOTYPE. — AHF No. 6120, female, 3.7 mm. 



