178 U.S. NATIONAL MUSEUM BULLETIN 2 60 



lateral process, of uropod 2 with obsolescent process; telson cleft 

 about halfway. 



Female. — Antenna 1 slightly longer than antenna 2, very slender, 

 article 2 about 1.3 times as long as article 1, article 3 about 0.85 times 

 as long as article 1, basal flagellar articles not coalesced. 



HoLOTYPE. — AHF No. 6124, male, 5.1 mm. 



Type-locality.— Station 7358, 27°35'45'' N, 115°08'30" W, 1095- 

 1205 m, Apr. 21, 1961. 



ISIaterial. — 25 specimens from the type-locality. 



Relationship. — This species closely resembles S. coh russet a^ new 

 species, and might be a more fully developed male of that species 

 although it differs from S. cohasseta in having a well-developed 

 posteroventral tooth on pleonal epimeron 2, a shorter article 5 of 

 gnathopod 2, a shorter cleft of the telson, a much broader, slightly more 

 ventrally extended and more finely serrate lobe on article 2 of pereopod 

 5 and numerous other small differences, which may be seen by com- 

 paring the illustrations. 



Syrrhoites yusilla Enequist (1950) has pleonites and epimera similar 

 to those of S. dulcis but its rostrum is much longer and strongly down- 

 turned, it lacks a peduncular process on uropod 1, has a smaller coxa 

 4, a poorly developed tooth on pleonite 4 and a much larger tooth on 

 pleonite 5. In the type-series of S. cohasseta^ one specimen has the 

 tooth of pleonite 5 poorly developed and another specimen has the tooth 

 of pleonal epimeron 3 poorly developed. 



Syrrhoites dulcis has many morphological similarities to S. tercerls 

 J. L. Barnard (1964b). Specimens of the latter species were in poor 

 condition when described and the following characters may not have 

 been assessed adequately : the occurrence of a process on urosomite 1 

 above the insertion of uropod 1, and the presence of a peduncular proc- 

 ess on uropod 1. Syrrhoites dulcis differs from S. terceris in the 

 shape of pleonal epimeron 3 (the latter species having an oblique 

 ventral margin, a short posterior margin and a distinct tooth at the 

 posteroventral corner), by the occurrence of a peduncular process on 

 uropod 1, a process above the insertion of uropod 1, and the commence- 

 ment of dorsal teeth on pereonite 3 instead of pereonite 5. No article 

 2 on the outer ramus of uropod 3 has been observed in S. dulcis. 



Syrrhoites redox, new species 



Figures 87, 88 



Diagnosis or female. — Rostrum of medium length, slender ap- 

 parently turned downwards slightly (reconstructed in illustration) ; 

 lateral cephalic lobe broad, poorly projecting, smooth, rounded, an- 

 teroventral comer subacute; antennae moderately slender, antenna 2 



