50 " Aristias 



pigment, without Visual elements. Antenna 1 in 9 , peduncle thick, flagelliini 

 Dot as long as peduncle, 5-jointed, accessory flagellum 2-jointed. Antenna 2. 

 flagellum much shorter than peduncle, 4-jointed. Gnathopod 1, 5*'^ Joint 

 stout, 6*^ a little longer than 5**», bind margin serrulate, a small palm. 

 Gnathopod 2, 6*^ Joint more than half as long as 5*^, narrowed distally. 

 üropod 3, rami rather short, spiniform 2*^ Joint of outer abruptly narrower 

 than 1^* Joint, inner ramus mucroniform, a little shorter than outer. Telson 

 Short and broad, cleft narrowly neariy to the base, with a spinule at each 

 rounded apex. Body semi-pellucid, yellowish. L. 9 3 mm. 



Trondhjemsfjord, Aretic Ocean (Nordland, very deep water; Troiusö). 



3. A. commensalis Bonnier 1896 A. c, J. Bonnier in: Ann. Univ. Lyon, v.2iy 

 p. 614 t. 35 f. 4. 



Body thick, compact. Head, lateral corners slightly produced to obtuse 

 apex. Side-plates not very large; pleon segments 1 — 3, postero-lateral corners 

 subquadrate. Eyes round, remaining reddish in spirit. Antennae 1 and 2 short, 

 equal. Antenna 1, flagellum with 6 joints, 1^^ very large, densely clothed, the rest 

 small; accessory flagellum as long as 1^* Joint of primary, 5-jointed. Antenna 2, 

 ultimate and penultimate joints of peduncle equal, flagellum with 10 joints, 

 6 calceoli. Epistome carinate. Mandible, palp attached behind the molar. 

 Maxillipeds, inner plates forming a little double cfest, outer large, palp small, 

 1^* Joint broad, finger very short. Gnathopod 1, 5*^ Joint as long as 6'^, 6*^ 

 tapering, bind margin crenulate, finger small. Gnathopod 2, 0*^ Joint twice 6*^, 

 6**1 with the minute finger forming a tiny chela. Peraeopods 1 — 5 tolerably stout. 

 Pcraeopods 3 — 5, 2^ Joint expanded, bind margin serrate. Uropod 1 spinöse; 

 uropod 3, inner ramus broad, with 3 spinules on distal part of outer margin, 

 outer ramus longer, serrate on inner margin, with small 2<^ Joint. Telson 

 cleft to the base, with 1 or 2 pairs of marginal spines and 2 or 3 on the 

 obtuse apices. L. ö 10 mm. 



Bay of Biscay. Depth 800 and 960 m. Oii Pheronema grayi S. Kent, and Pteraster 

 personatus P. Sladen. 



4. A. neglectus H. J. Hansen 1859 Anonyx tumidus (err., non Krayer 1846!), 

 R. M. Bruzelius in: Svenska Ak*. Handl., n. ser. «7.3 nr. 1 p- 41 | 1867 A. t., Cam. Heller 

 in: Denk. Ak. Wien, u26ii p. 25 t. 3 f. 6— 12 | 1871 Aristias t., A. Boeck in: Forh. 

 Selsk. Christian., 1870 p. 107 j 1872 A. t, A. Boeck, Skand. Arkt. Amphip., v. 1 p. 148 

 t. 3 f.4 i ?1861 Lysianassa ciliata, E. Grube, Ausfl. Triest, p. 135 j 1887 Aristias neglectus, 

 H.J.Hansen in: Vid. Meddel., ser. 4 v.9 p. 67 j 1893 A.n., A. Della Valle in: F.FI. 

 Neapel, v.20 p. 844 t. 6 f. 9; t. 26 f. 16—31 | 1895 A. n., G. 0. Sars, Crust. Norway, r.l 

 j). 675 I 1890 A. aicdouinianus (err., non Lysianassa audouiniana Bäte 1856!), G. O. Sars. 

 Crust. Norway, v. 1 p. 48 t. 17 f. 2. 



Head, with lateral corners almost rectangular and slightly produced. 

 Pleon Segment 3, lateral angies narrowly rounded, margin smooth. Eyes 

 rounded oval, black with a whitish coating. Antenna 1 in 9 , flagellum 10-jointed. 

 accessory flagellum 5-joini;ed. Antenna 2 in 9 , flagellum 9-jointed. Gnatho- 

 pod 1, 6**^ Joint fully as long as 5*^ bind margin finely serrate, apically scarcely 

 forming a palm. Gnathopod 2 long and slender, 6*^ Joint about half length 

 of 5*^ Peraeopods 1—5, 6*"^ Joint produced to a short tooth-like process. 

 Peraeopods 3 — 5, 4*^^ Joint very little expanded. üropod 3, outer ramus 

 little longer or broader than inner. Telson longer than broad, cleft beyond 

 middle, not to base, with rather wide incision, 3 spinules at each apex. 

 Oolour corneous yellow, ovaries dark bluish. L. 8 mm. 



Aretic Ocean, North-Atlantic, Xorth-Sea, Skagerrak and Kattegat (South- and 

 West-Scandinavia, Shetland Islands); Mediterranean. 



