82 Ürchomenella 



Head, lateral angles broadly rounded iu 9, iiarrower iu ö. Side- 

 plate 1 of uniform width, 5*^ of equal breadth and depth, lower hinder angle 

 scarcely produced. Pleou segment 3, postero-lateral angles rounded, bind margin 

 smooth, 4*^^ segment witli deep dorsal depression. Eyes large, oval, widened 

 below, light red. Antenna 1, flagellum in 9 witb 8 joints, in d with 12, 1 *** large 

 and birsute, accessory flagellum witb 3 joints, 1^* long, sligbtly dilated, birsute. 

 Antenna 2 in 9 little longer tban antenna 1, in d about once and a balf as 

 long. Epistome flattened in front, not projecting beyond upper lip. Gnathopod 1 

 ratber robust, 6^^ Joint a little longer tban 5^^, sligbtly tapering, palm 

 ti-ansverse. Gnatbopod 2, 6^^ Joint oval, fully balf as long as 5*^, obtusely 

 produced beneatb tbe minute finger. Peraeopods 3 — 5, 2*^ Joint nearly as 

 long as rest of leg. Uropod 3 iu 9 , inner ramus not longer tban basal Joint 

 of outer. Telson ratber broad, triangulär, with 1 pair of marginal spinules, 

 cleft naiTOw, extending beyond tbe centre. Colour greyisb wbite. L. 9 

 over 5 mm. 



North-Atlantic, North-Sea and Skagerrak (Sonth-Norvvay, France, Holland, 

 Great Britain). 



3. O. pinguis (Boeck) 18öl Anonyx p., A. ßoeck in: Forh. Skand. Naturf., 

 Mede 8 p. 642 ! 1893 A. p., A. Della Valle in: F. Fl. Xeapel, v. 20 p. 821 t. 28 f. 22—35 | 

 1871 Orchomene pingvis, A. Boeck in: Forh. Selsk. Christian., 1870 p. 115 | 1872 & 76 

 O.p., A. Boeck, Skand. Arkt. Amphip., v.l t. 5 f . 1 ; v.2 p. 176 j 1890 &95 Orchomenella p., 

 G. 0. Sars, Crust. Norway, v.l p. 67 t. 24 f. 2; p. 683 | 1893 Tryphosa pinguis, J. 

 Bonnier in: Bull. sei. France Belgique, w. 24 p. 196. 



Head, lateral angles narrowly rounded, produced. Side-plate 1 a little 

 expanded or narrowed (Della Valle) below, 5*^ deeper tban wide, produced 

 downward bebind. Pleon segment 3, postero-lateral angles scarcely rounded, 

 bind margin minutely crenulate or smootb (Della Valle). Eyes narrow, reniform, 

 ligbt red. Antenna 1, flagellum witb 8 — 11 joints, 1^* large, birsute, accessory 

 flagellum witb 4 joints. Antenna 2 in 9 decidedly longer tban antenna 1, 

 flagellum witb 15 joints, in ö witb 20 joints. Epistome scarcely projecting in 

 front of Upper lip, defined from it by distinct incision. Gnatbopod 1 ratber short 

 and stout, 6*^ joint mucb longer tban 5*^ tapering to tbe transverse palm. 

 Peraeopods 3 — 5, 2*^ Joint sborter tban tbe rest of tbe limb. Uropod 3, 

 inner ramus scarcely as long as basal Joint of outer, wbicb in 9 bas 3 setae 

 on inner margin. Telson tapering, witb 2 pairs of marginal spinules, cleft 

 usually extending beyond tbe centi*e, scarcely debiscent. Colour wbitisb. 

 L. 9 4 — 7-5 mm. 



Arctic Ocean, North-Atlantic, North-Sea and Skagerrak (Siberia, South- and West- 

 Norway, Malangenfjoi-d [Finmark]); Mediterranean. 



4. O. minuta (Kreyer) 1846 Anonyx minutus, Xreyer in: Naturh. Tidsskr., 

 ser. 2 v.2 p. 23 ', 1846 A. m., Xreyer in: Voy. Nord, Crust. t. 18 f. 2 a— t j 1893 A.m., 

 A. Della Valle in: F. Fl. Neapel, u 20 p. 826 \ 1866 Lysiannssa minuta, Goes in: Öfv. 

 Ak. Förh., r. 22 p. 520 | 1871 Orchomene minutus, A. Boeck in: Forh. Selsk. Christian., 

 1870 p. 116 1 1893 0. m., J. Bonnier in: Bull. sei. France Belgique, i;.24 p. 194 | 1890 & 

 95 Orchomenella minuta, G. 0. Sars, Crust. Norway, v. 1 p. 66 t. 24 f. 1 ; p. 683 [ 1895 

 0. m., Ohlin in: Acta Univ. Lund., «.31 ur. 6 p. 22 | 1894 0. minuttcs, T. Stebbing in: 

 Bijdr. Dierk., v. 17 p. 6. 



Head, lateral angles in. 9 almost quadrate, in (5 ratber naiTOW and 

 acute. Side-plate 1 of uniform widtb, 5*^ deeper tban broad, produced 

 downward behind in ti'iangular lobe. Pleon segment 3, postero-lateral angles 

 a very little produced, bind margin smootb, 4*^^ segment witb sballow dorsal 



