20 Euonyx, Opisa 



not mucli louger than antenna 1, ultimate joiut of peduucle shorter thau peii- 

 ultimate. flagellura 35-jointed. Mandible with molar distinct but not denticulate, 

 palp central. Maxiila 1 with 8 plumose setae on inner plate. Maxillipeds. outer 

 plates rather large, but not reaching end of 2^ Joint of palp, spine-teetli of 

 inner margin minute and numerous. Gnathopod 1 with few setules, 3^ Joint 

 longer tlian ö*'', mucli shorter tlian 6*^, 4*'' and 5^'' joints equal, 6*'' with 

 bind margin concave, the closely adjacent finger and thumb forming a chela 

 of not more than \\ length of band. Gnathopod 2 longer. not stronger than 

 gnathopod 1. 6**' Joint slender, not widening distally. about ^o length of b^^, 

 the minute 7^'' Joint not curved, but closely adjusted to the oblique palra. 

 Peraeopods 8 — 5, 2*^ Joint roundly quadrangular, 4**' very moderately expanded. 

 Uropod 3 with many little spines on tlie short broad rami, of which the 

 inner reaches the 2^ j(»int of the outer. Teison with some marginal spiuules, 

 oblong, cleft '^/^ length, apices blunt, notched. L. o 15 mm. 



Soutli-Pacific (Kermadef Islands). Depth 1140 m. 



10. Gen. Opisa Boeck 



18-12 Opis (Sp. im.: 0. eschrichtü) (non Defrance 1825, Mollusca!), Kreyer in: 

 Naturh. Tidsskr., ?i 4 p. 149 | 1876 Opisa (Sp. typ.: Opis typicn), A. Boeck, Skand. 

 Arkt. Amphip., v.2 p. 190 ! 1890 0., G. O. Sars, Crust. Noi-w^ay, v. l p. 36 j 1893 0. 

 (part.), A. Delhi Valle in: F. Fl. Neapel, v.'AO j). 806. 



Side-plate 1 short. partly concealed by 2'^, 4*'' deeply excavate behind. 

 Upper lip rather broadly rounded. Mandible. cutting edge smooth, spine-row 

 feeble, molar obscure, in any case without triturating surface; palp rather 

 far back, 2"^ Joint strongiy setiferous. Maxiila 1 normal, 2 setae on narrow 

 inner plate. Maxiila 2, plates setose only apically. Maxillipeds. inner plates 

 normal, outer plates augular at apex, inner margin denticulate. palp normal, 

 rather short. Gnathopod 1 chelate, 5*'' Joint small, ii^^ greatly widened, the 

 thuinb acute, not very long, leaving a great cavity between itself and the 

 much curved tinger (7^^ Joint). Gnathopod 2 subchelate. Peraeopods 1 - -5 

 not elongate, most of the joints slender, 2^ Joint in peraeopods 3 — 5 greatly 

 expanded. Uropod 3 elongate. Telson elongate, deeply cleft. 



1 species. 



1. O. eschrichtü (Kioyer) 1842 Opis e., (Holbell in MS.) Kreyer in: 

 Naturh. Tidsskr., v. 4 p. 149 | 1876 Opisa eschrichti, A. Boeck, Skand. Arkt. Amphip., 

 V. 2 p. 190 ; 1890 0. e., G. 0. Sars, Crust. Norway, v. 1 p. 36 t. 14 f. 1 ' 1893 O. eschrichtü, 

 A. Della Valle in: F. Fl. Neapel, v. 20 p. 806 | 1846 Opis tjjinca, Kroyer in: Naturh. 

 Tidsskr., ser. 2 v.'i p. 46 | 1846 0. t, Kroyer in: Voy. Nord, Crust. t. 17 Tl. 



Pleon Segment 3, postero-lateral angies rounded. Eyes rather large, 

 oblong, pigment dark brown. Antenna 1, 1^* Joint very large. flagelluin 

 8-jointed, about as long as peduncle, 1*** Joint very large, especially in cj. 

 accessory flagellum 5-jointed, rather long. Antenna 2 in 9 scarcely longer 

 than antenna 1, in (5 as long as body, with calceoli. Gnathopod 1, 6*^» Joint 

 nearly globular. Gnathopod 2, 6**» Joint about ^j^ length of 5*^, slightly 

 dilated distally, apex truncate. Peraeopods 3-— 5, 2"^ Joint large, rounded 

 oval, nearly as long as rest of limb. Uropod 3, rami mucli longer than 

 peduncle, outer ramus the louger, with distinct terminal Joint. Telson about 

 3 tiraes longer than broad, cleft nearly to base, 2 pairs of dorsal and 1 of 

 terminal spiimles. Whitish, with dark brown intestina seen through skin. 

 L. 7 — 8 mm. 



Arctic Ocean, North-Atlantic, North-Sea and Skagerrak (Iceland, Norway); 

 Korea Sea, depth 66 m. 



