Leinbos 597 



Body rather slender, uear to L. longipes. Side-plate 1 as in d and Q 

 of L. spiniventris (p. 595), 2"^ — 4*** rotundo-quadrate, 5*** uearly as deep as 4*^. 

 Pleon Segment 3, postero-lateral coruers subqiiadrate. Eyes without Visual 

 elements, represented by patch of whitishpigment on each side. Antenna 1 slender, 

 nearly as long as body, 2*^ Joint much longer than l***, thrice as long as 3*^, 

 flagellum nearly twice as long as peduncle, about 20-jointed, accessory 

 flagellum 4-jointed. Antenna 2 little over half as long as antenna 1, ulti- 

 mate Joint of peduncle as long as penultimate, longer than flagellum. Gnatho- 

 pod 1 in (5, 2*1 Joint with tuft of short setae at lower hind corner; 3*^ — 5*^ 

 densely setose only along hind margin; 5^^ a little shorter than 6*^^; 6*** broad, 

 oblong oval, but with nearly transverse palm, defined by a sharp tooth 

 separated from a submedian angle by an excavation ; apex of finger crossing 

 the defining tooth. Gnathopod 2 in d slender, the rather long and naiTOW 

 5*^ and 6*^ joints densely setose on both margius, especially the front, palm 

 Short, slightly oblique, matching finger. Gnathopod 1 in o , palm oblique, 

 not strongly defined. Gnathopod 2 in o much smaller than gnathopod 1, 

 shaped as in the ö, but slightly furnished on front margin. Peraeopod 1 

 in d, but not peraeopod 2, having 4*^ Joint densely setose on both margins, 

 but especially on the front. Peraeopods 3 — 5, 2^ Joint little expanded; peraeo- 

 pod 5 very elongate in d and 9 . üropod 3, inner ramus somewhat larger 

 than the outer. Telson with a setule on either side of the apex. Colour 

 uniformly yellowish. L. d 8 mm. 



Arctic Ocean. North-Atlantic and North-Sea (Norway from Stavangerfjord up 

 to Finmark). Depth 94 — 564 m. 



6. L. longipes (Lilj.) 1852 Gammarus l, AV. Liljeborg in : Öfv. Ak. Förh., v.9 p. 10 1 

 1855 G.(Gammaropsis)l., W. Liljeborg in: Vetensk. Ak.Handl., 1853 [).457 i I85d Autonoel., 

 R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr. 1 p. 28 | 1893 Ä. l. (part.), A. 

 Della Valle in: F. Fl. Neapel, u 20 p. 403 | 1894 Autonoel., G. 0. Sars, Crust. Norway, 

 V. 1 p. 549 t. 195 f. 1 I 1895 A. l, A. M. Norman in: Ann. nat. Hist., ser. 6 v. 15 p. 490 j 

 1862 Microdentopus l, Bäte, Cat. Amphip. Brit. Mus., jj. 166 | 1895 Lembos l, T. Stebbing 

 in: Ann. nat. Hist., ser. 6 v. 16 p. 207 | 1871 Autonoe plumosa, A. Boeck in: Forh. Selsk. 

 Christian., 1870 p. 239 | 1876 Autonoe longipes (part.) -|- A. p., A. Boeck, Skand. Arkt. 

 Amphip., V. 2 p. 572 t. 25 f. 2; p. 574 t. 25 f. 3. 



. Body more slender and side-plate 1 in d less produced than in L. websterii 

 (p. 599). Pleon segment 3, postero-lateral corners rotundo-quadrate. Eyes small, 

 rounded, black. Antenna 1 about % as long as body, 2^ Joint much longer 

 than l^S thrice as long as 3*^; flagellum longer than peduncle, about 18-jointed; 

 accessory flagellum 3- or 4-jointed. Antenna 2 much shorter, ultimate Joint 

 of peduncle as long as penultimate, rather longer than the 6-jointed flagellum. 

 Gnathopod 1 in d, 2"^ Joint broad, with deuse brush of long setae at lower 

 hind corner, 4*^ and b^^ with fascicles of setae on hind margin, 5*^ fringed 

 only on distal part of front raargin, 6*^' all along it; 6*^ longer than o^^, 

 oblong oval; palm bideutate but oblique, so that the tip of the larger defining 

 tooth does not reach the level of the smaller inner tooth. Gnathopod 2 in d 

 nearly as long as gnathopod 1 but much more slender, 5*^ Joint longer than 6*^, 

 both long and setose, especially on the front margin; palm short, rather 

 oblique. Gnathopod 1 in 9 not robust, 6*^ Joint rather longer than 5*^ 

 widening a little to the rather oblique palm, defined by an obtuse angle and 

 slender spine. Gnathopod 2 in 9 rather more slender, 6*^ Joint subequal to 5*^ 

 narrow, palm almost transverse. Peraeopods 1 — 5 slightly armed. Peraeo- 

 pods 3 — 5, 2*^ Joint oblong oval. Peraeopod 5 much the longest. üropod 3, 



