350 Hhachotropis 



much larger, but still small, in all 3 oval, with lower bind corner acute, 

 üropod 1, rami nearly equal; uropod 2, outer ramus somewhat shorter than 

 inner; uropod 3, rami nearly equal, broad and long, narrowing rather 

 abruptly to the acute apex; all the rami spinuliferous. Telson long, narrow, 

 spinuliferous, more than 3 times as long as broad, tapering little tili near 

 tbe acute apices, wbich are separated by an exceediugly short slightly dehis- 

 cent slit. L. 11 mm. 



Southeru Indian Ocean (Kerguelen Island). 



3. R. grimaldii (Chevreux) 1887 Tritropis g., Chevreux in: Bull. Soc. zool. 

 France, ti. 12 p. 571 | 1888 Rhachotropis g., T. Stebbing in: Rep. Voy. Challenger, v. 29 

 p. 1641 I 1893 B. g., G. 0. Sars, Crust. Norway, v. 1 p. 424. 



Peraeon inflated, slightly carinate but without teeth, pleon Segments 1 — 3 

 tiicarinate, the carinae produced into long sharp teeth, upturned, especially 

 those on segment 3. Head. rostrum short, straight, forming an angle with 

 Upper surface of head, lateral corners elongated. slightly rounded at apex. 

 Side-plate 1 produced into a narrow angular lobe, lower margin behind 

 endiug in an obtuse tooth. Pleon segment 3, postero-lateral lobe prolouged 

 backward, broadly rounded, firmly sen-ate. Antenna 1, 1^* Joint ending in 

 2denticles, 2'^ rather longer, 3^ not quite half as long as 2*^, flageÜum 11-jointed; 

 no trace of accessory flagellum. Antenna 2 longer, ultimate and penultimate 

 joints of peduncle long, equal, flagellum 14-jointed. Gnathopod 1, 5*^ Joint 

 with long narrow lobe, 6*'^ large, elongate oval, finger shorter than palm, 

 thin, cuiTed. Gnathopod 2 unknown. Peraeopods 3 and 4, 2^ Joint naiTOW, 

 smooth. Peraeopod 5, 2*^ Joint with bind margin broadly rounded, sti'ongly serrate. 

 Uropods 1 — 3 long and equal (?). Telson very long, cleft '/^ of length. 

 L. 11 mm. 



North-Atlantic (Cape Finisterrc). Depth 510 m. 



4. R. elegans (ßonnier) 1896 Rachotropis e., .1. Bonnier in: Ann. Univ. Lyon, 

 V. 26 p. 658 t. 39 f. 4. 



Perhaps identical with ß. grimaldii. Slightly compressed, peraeon 

 Segments 1 — 7 dorsally raised behind, producing a regularly undulating 

 profile, pleon segments 1 — 3 tricarinate, carinae produced into teeth, some 

 slightly upward turned, the central preceded by a small hump, segments 4 — 6 

 without any crest. Head with dorsal hump, rostrum very small. Pleon 

 segment 3, postero-lateral margins rather produced, firmly sen-ate. Eyes 

 wanting. Antenna 1 in (5, V^ Joint long, little longer than 2^, S^ very 

 short, flagellum longer than peduncle, accessory flagellum a singie very 

 short Joint. Antenna 2 much longer, ultimate Joint of peduncle rather 

 longer than penultimate, flagellum much longer than peduncle. No calceoli, 

 but many long sensoiy setae. Peraeopod 5, 2*^ Joint figured as oblong 

 oval, not narrowed below. Telson reaching extremity of uropod 3 (in figure 

 surpassing it), cleft % of length. Many parts figured, but not described. 

 L. a little over 9 mm. 



Bay of Biscay. Depth 950 m. 



5. R. oeulata (H. J. Hansen) 1887 Tritropis o., H. J. Hansen in: Vid. Meddel., 

 ser.4«7.9 p.l40 t.5 f.7— 7e | 1888 Rhachotropis o., T. Stebbing in: Rep. Voy. Challenger, 

 V.29 p. 1644, 1721 | 1893 B. o., G. O. Sars, Crust. Norway, v. 1 p. 424 | 1893 Pontogeneia 

 aculeata (part.), A. Dell* Vall« in : F. Fl. Neapel, v. 20 p. 616. 



