30 Cyphocaris, ('yclocaris 



of 5*^ Joint, inner margin of process cut into about 7 teeth, end of limb 

 as in peraeopods 1 and 2. Peraeopod 4, 2<^ Joint little produced bebind, tbe 

 bind margin divided into 11 teetli. joints 4, 5 and 6 longer tban in peraeopod 3, 

 palm narrower. Peraeopod 5, 2*^ Joint with bind margin cut into 14 teetb, 

 5*^ and 6*^ joints very elongate, no palm mai-gin, finger nearly sti-iigbt. 

 üropod 3, outer ramus witb small 2^ Joint, inner not shorter tban outer, 

 botb witb plumose setae. Telson long, narrow. cleft nearly % of lengtb, 

 with 2 or 3 pairs of lateral spinules, and an apical pair. L. 14 mm. 



South-Pacific (west of South America, depth 2700 ni); South-Atlantic (Tristan 

 da Ciinha, depth 2565 m); North- Atlantic (Cape Farewell, depth 540 m). 



16. Gen. Cyclocaris Stebb. 



1888 Cyclocaris, T. Stebbing in: Rep. Voy. Challenger, t\ 29 p. 664 | 1893 C, 

 A. Delia Valle in: F. FI. Neapel, f. 20 p. 843. 



Head deep. Side-plates 1 and 2 very small, 3<i and 4*^ large. Antenna 1, 

 peduncle very sbort. Mandible, cutting edge broad, simple accessory plate 

 minute, molar weak or wanting, palp central (Fig. 7). Maxiila 1 with 

 several plumose setae ou inner plate, 11 spines on broad apex of outer plate, 

 2'^ Joint of palp long, quinque-dentate. Maxilla 2, inner 

 plate mucb shorter tban outer, inner margin setose. Maxilli- 

 peds, inner plates witb wide concave distal margin. outer 

 plates broad and long, fringed with setae, spines and teetb. 

 Gnathopod 1 simple, 3*^ Joint mucb louger tban 4^^, b^^ 

 longer and slightly wider tban tbe long narrow tapering 6*^, 

 7*'^ slender. Gnathopod 2 slender. 5'^'> Joint mucb longer 

 tban ö^h, which is also long and narrow, not tapering; 

 7**1 Joint small, tbick at base. closing over sbort palm. 

 Peraeopods 1 and 2 not very slender, side-plate of peraeo- 

 pod 1 distally dilated, tbat of peraeopod 2 very little 

 Fig. 7. c. tahitensis. excavate behiud, 4*ii Joint in each rather large. Peraeo- 

 Mandibie. pods 3—5 pretty strongly spined, 2*^ Joint broadly expanded, 



4th yej.y iiioderately. Uropod 2 with rami unequal, uropod 3 reaching far beyond 

 uropod 2, tbe outer ramus tbe longer. with a small 2*^ Joint. Telson long, 

 narrow, tapering, cleft nearly to tbe base, a spiniferous notch at each apex 

 with tbe inner point tbe longer. 



2 species. 



Synopsis of species: 



Side-plate 1 distally narrowed 1. C. tahitensis . . p. 30 



Side-plate 1 not distally narrowed 2. C. giiilelmi . . p. 31 



1. C. tahitensis Stebb. 1888 C. t., T. Stebbing in: Hep. Voy. Challenger, «;.29 

 p. 664 t. 18. 



Side-plate 1 distally narrowed. Pleon segment 3 with blunt angles. 

 Eyes uncertain. Antenna 1, peduncle tumid, 2<^ and 3*^ joints very sbort; 

 flagellum with 10. joints, 1^* stout, as long as peduncle or as rest of flagellum; 

 accessory flagellum with 6 joints, 1** long. Antenna 2, ultimate Joint of 

 peduncle a little longer tban penultimate; flagellum 25-joiuted. Mandible with 

 a tooth at the top of cutting edge, and lower margin behiud its lower angle 

 slightly serrate (Fig. 7), molar obscure. Gnathopod 2, 5*^ Joint mucb longer 

 than 3*^. üropod 1, rami subequal. L. about 10 mm. 



Tropical Pacific (Tahiti). Taken in townet. 



