608 Photis 



b^^ scarcely so long as 4^^ or 6*'\ Peraeopod 4 longer than peraeopod 3. 

 Peraeopod 5 much longer than peraeopod 4; 2*^ Joint rather narrowly oblong, 

 üropod 3 (Fig. 103), outer ramus about as long as peduncle, 2*^ Joint tipped 

 yfith a long straight spine. Telson (Fig. 103) about as broad as long, with 

 setules on either side of the triangulär apex. L. less than 4 mm. 



Southern Indian Ocean (Kerguelen Island). 



4. P. longicaudata (Bäte & Westw.) 1862 Eiscladus longicaudatus, Bäte & 

 Westwood, Brit. sess. Crust., v.l p. 412 f. | 1869 Heiscladus l., A. M. Norman in: Rep. 

 Brit. Ass., Meet. 38 p.284 ! 1874 Heiscladius l., M'Intosh in: Ann. nat. Hist., ser. 4 w. 14 

 p. 269 I 1877 Photis longicaudata, Meinert in: Naturh. Tidsskr., ser. 3 ?;.ll p. 142 j 1887 

 P.l, Chevreux in: Bull. Soc. zool. France, tj. 12 p.311 \ 1894 P. l, G.O. Sars, Crust. 

 Norway, v.l p. 571 t. 203 f . 1 | 1895 P. longicaudatus, A. O.Walker in: Ann. nat. Hist., 

 ser. 6 «;. 15 p.471 \ 1871 P lütkeni, A. Boeck in: Forh. Selsk. Christian., 1870 p. 233 | 

 1876 P. l, A. Boeck, Skand. Arkt. Amphip., v. 2 p. 556 t. 26 f . 2 | 1893 P. reinhardi 

 <part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 395 t. 3 f. 3, 1. 10 f. 1—19. 



Body more slender than in P. reinhardi (p. 607) and side-plates less 

 deep. Head, lateral lobes greatly projecting, narrowly rounded. Side-plate 5 

 distally narrowly rounded. Pleon segment 3, p oster o-lateral corners rounded. 

 Eyes very small, round, close to margin of lateral lobes of head. Antennae 1 

 and 2 slender, not densely setose, subequal, more than half as long as body, 

 flagellura 8- or 9-jointed. Antenna 2, antepenultimate Joint of peduncle 

 unusually narrow and elongate. Gnathopod 1, 5*^* Joint not greatly widened 

 ■distally, about as long as 6*^, which widens to the oblique, obtuse-angled palra^ 

 Gnathopod 2 in d, 2^ Joint produced into a rounded decurrent lobe at 

 distal front corner; 5*^ Joint cup-shaped; d^^ widening to the palm, which 

 is defined by a projecting angle, being also somewhat excavated in the 

 middle, and exhibiting, on either side of the excavation, a slight angular 

 projection (Sars), deeply excavated and slightly ciliated (Bäte). Peraeo- 

 pods 1 — 5 much more slender than in P. reinhardi. Peraeopods 1 and 2, 

 6*^ Joint very narrow, nearly twice as long as 5*^. Peraeopod 5 conside- 

 rably longer than the other peraeopods. üropod 3, outer ramus longer than 

 peduncle, 2^ Joint tipped only with 2 slender setae. Telson very small, 

 shaped as in P. reinhardi. Colour whitish with light brown bands, flagella 

 of antennae crimson. L. ö scarcely over 4 mm (Sars), reaching 12 mm 

 (Bäte, Walker). 



North-Atlantic with adjoining seas (Norway, Denmark, Great Britain, France); 

 Mediterranean (Naples). Depth 10 — 56 m. 



5. P. tenuieornis O. Sars 1882 P. t, G. O. Sars in: Forh. Selsk. Christian., 

 nr. 18 p. 110 t. 6 f. 4 I 1894 P. t., G. O. Sars, Crust. Norway, v.l p. 572 t.203 f. 2 | 1893 

 P. reinhardi (part.)?, A. Della Valle in: F. Fl. Neapel, ».20 p. 397. 



Body Short, stout, back broadly rounded. Head, lateral corners well 

 produced, narrowly rounded. Side-plates 1 — 5 large and deep, especially 

 in 9 ; 1^* rather narrowed distally ; 6^^ large, distally expanded. Pleon 

 segment 3, postero-lateral corners subquadrate, slightly produced. Eyes veiy 

 small, close to margin of lateral lobes of head. Antennae 1 and 2 equal, 

 veiy slender, sparsely setose, about ^s ^s long as body. Antenna 1, 1^* Joint 

 shorter than 2^, a little longer than 3<^; flagellum nearly as long as peduncle, 

 5-jointed. Antenna 2, flagellum as long as ultimate and penultimate joints of 

 peduncle, 5-jointed. Gnathopod 1 in d, b^^ Joint as long as 6*^ distally 

 widened; 6**^ oval, but with the oblique palm deeply excavate, defined by a 



