338 Melphidippella, Eusiridae, Eiisirus 



rather narrow, in length subequal to the sublinear 6^^, wMch has a very short 

 palm and finger to match. Peraeopods 1 and 2, 4*^, 5*^ and 6*^ joints 

 subequal. Peraeopods 3 — 5 longer and somewhat stronger. Uropod 3, rami 

 a little longer tban peduncle. Telson cleft much beyond the middle, slender 

 spinules along lateral margins, a long spine in each apical notcb. Colour 

 brick-red, mottled with opaque white. L. 6 mm. 



North- Atlantic, North-Sea and Skagerrak (Norway, Shetland Isles); Kattegat. 

 Depth 11— 54 m. 



27. Farn. Eusiridae 



1888 Emiridae, T. Stebbing in: ßep. Voy. Challenger, v. 29 p. 953 | 1893 E., 

 (j. O. Sars, Crust. Norway, v. 1 p. 414. 



Pleon strongly developed. Head, margins incised for base of antenna 2. 

 Side-plate 1 usually distally expanded (Fig. 79 p. 341). Antennae 1 and 2 

 (Fig. 82 p. 347), peduncle long; antenna 1 usually with small accessory 

 flagellum. Upper lip not bilobed. Lower lip with small inner lobes. Mandible, 

 molar generally well developed, 3*^ Joint of palp elongate. Maxillae 1 and 

 2 and maxillipeds normal; maxillipeds with strong palp. Gnathopods 1 

 and 2 (Fig. 80 p. 344) subequal, with large subchelate hands. Peraeopods 1 

 and 2 slender, shorter than the hinder peraeopods. üropod 3 usually with 

 subequal rami (Fig. 81 p. 344). Telson large, partly cleft. 



Marine. 



6 genera, 26 accepted species and 1 obscure. 



Synopsis of, genera: 



, Gnathopods 1 and 2, 6*^ Joint attached to 

 ^ j produced apex of öth — 2. 



\ Gnathopods 1 and 2, 6tli Joint with normal 

 ^ attachment to öth — 3. 



I Gnathopods 1 and 2 (Fig. 79), 5th Joint with 



) hind lobe prominent . 1. Gen. Eusirus p. 338 



j Gnathopods 1 and 2, 5th joint with hind lobe 



' not prominent 2. Gen. Eusiropsis . . . p. 343 



J Peraeopods stout 3. Gen. Eusiroides . . • p. 345 



I Peraeopods (Fig. 83 p. 347) slender — 4. 



J Body smooth 4. Gen. Cleonardo . . . p. 346 



\ Body spiny and carinate — 5. 



f Telson elongate 5. Gen. Rhachotropis . p. 347 



\ Telson short 6. Gen. Rozinante . . . p. 354 



1. Gen. Ensirus Kr0yer 



1845 Eusirus (Sp. un. : E. cuspidatus), Kreyer in : Naturh. Tidsskr., ser. 2 n 1 

 p. 501, 511 I 1861 E., A. Boeck in: Forh. Skand. Naturf., Mede 8 p. 655 | 1888 E., 

 T. Stebbing in: Hep.Voy. Challenger, zj. 29 p. 964 | 1893 E., A. DellaValle in: F.Fl. 

 Neapel, v. 20 p. 669 1 1893 E., G. 0. Sars, Crust. Norway, v. 1 p. 415 | 1873 Eusinus, 

 A. Marschall, Nomencl. zool., p. 409. 



Body compressed, more or less carinate, with dorsal projections. Head, 

 rostrum small, lateral corners short, broad. Side-plate 4 the largest, emarginate 

 behind. Pleon segment 3, postero-lateral angles not produced, iat^al margin 



