44 



ürchomene 



26. Gen. Orchomene Boeck 



1871 Orchomene (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p. 114 I 187f> 

 0., A. Boeck, Skand. Arkt. Aniphip., v.2 p. 171 | 1890 0., G. 0. Sars, Crust. Norway, 

 v.l p.59 I 1893 0., J.Bonnier in: Bull. sei. France Belgique, ».24 p. 174 | 1873 Orchomena^ 

 E. V. Martens in: Zool. Rec, v.8 p. 188. 



Side-plates large. Pleon segment 3, postero-lateral angies uot produced,. 



generally serrate. Antenna 1, flagellura iu ö with calceoli, accessory flagellum 



well developed (Fig. 9). Antenna 2 in o , antepenultimate Joint of peduncle long, 



flagellum short, in d flagellum long filiform, with calceoli. Epistome projecting 



FiageUum Accessory flageUum roundly in fVont of uppei" lip. Mandible long^ 



molar very small. palp slender, set far back. 

 Maxiila 1, 2 setae on inner plate, outer with 

 apex scarcely oblique, palp with spine-teeth not 

 numerous. Maxilla 2, both plates long, narrow, 

 setiferous only apically. Maxillipeds, inner plates 

 elongate, outer long oval, weakly crenulate, palp 

 not very large. Gnathopod 1 short, stout, sub- 

 chelate, 6*^^ Joint longer than distally widened 5*^\ with distinct trausverse 

 palm, finger short, curved. Gnathopod 2 slender, 6*^ Joint narrow, produced 

 beneath the minute finger. Peraeopods 3 — 5, 2^ Joint very large. Uropod :} 

 in Q scarcely reaching beyond uropod 2, in ö much larger and plumose. 

 Cleft of telson not always reaching the centre. 



6 species. 



4' 



Synopsis of species: 



Pleon segment 3, hinder edge coarsely serrate — 2. 

 Pleon segment 3, hinder edge finely serrate or 

 smooth — 3. 



Pleon segment 4 with evenly rounded carina . . . 

 Pleon segment 4 with carina ending acutely .... 



Eyes dark — 4. 

 Eyes not dark — 5. . 



Pleon segment 3, bind margin- minutely crenulate . 

 Pleon segment 3, hind margin perfectly smooth . . 



Head, lateral angies acute, greatly projecting . . . 

 Head, lateral jwigles quadrate, slightly projecting . . 



1. O. serrata . 



2. O. pectinata 



3. O. batei . . 



4. O. hanseni . 



5. O. erispata. 



6. O. amblyops 



p. 44 



p.4& 



p.4& 

 p.4ft 



p.4& 

 p.4ft 



1. O. serrata (Boeck) 1861 Anonyx serratus, A. Boeck in: Forh. Skand. Naturf., 

 Mede 8 p. 641 | 1893 A. s., A. DellaYalle in: F. Fl. Neapel, v.20 p. 819 i 1871 Orcho- 

 menes. (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.ll5 | 1872&76 0. s., A. Boeck, 

 Skand. Arkt. Amphip., v.\ t. 5 f. 2; v.2 p. 172 | 1890 & 95 0. s., G. O. Sars, Crust. 

 Norway, v. 1 p. 62 t. 23 f. 1 ; p. 682 t. IV f. 1. 



Head, lateral angies considerably projecting and obtuse. Pleon segment 3,. 

 lateral angies quadrate, with their hind margin straight, coarsely serrate, forming 

 16— 20points,4*^ segment with evenly rounded dorsal carina behind the depression. 

 Eyes narrow oval, tapering above in 9, broad oval in d. Antenna 1 (Fig. 9)^ 

 flagellum with 8 joints, 1^* very large, especially in d, accessory flagellum 

 6-jointed. Antenna 2, flagellum 6-jointed in 9, little longer in d, but with 

 8 joints, 3 carrying calceoli. Gnathopod 1, 6*^ Joint of nearly uniform breadth, 

 nearly twice as long as 5*^ which is equal to 4*^. Peraeopods 3 - 5, 2"^ Joint 

 subequal in length to rest of limb. uropod 3 alike in 9 and d, inner ramus 



