142 Haipiuia 



entirely overlapping 4t^joint, hiud margin in 9 carrying long setae between 

 about 12 points of serration, the lower ones bipartite; in d a few setules 

 between 5 or 6 obscure points. üropod 3 in 9 , outer ramus with 3 spines 

 on outer margin of 1^* Joint, 2^ Joint not half length of 1***, inner ramus 

 little more than half length of same; in ö 2<* Joint more than half length 

 of 1^*, and inner ramus louger than 1^* Joint of outer. Telson sCarcely 

 broader than long, apices divergent, narrowly rounded. Colour greyish white, 

 pellucid. L. about 4 mm. 



Arctic Ocean, North- Atlantic, North-Sea and Skagerrak (Nonvay, depth56— 188m; 

 Bohuslän); Kattegat; Bay of Biscay. depth 950 m. 



3. H. pectinata O. Sars 1891 H. p., G. 0. Sars, Crust. Norway, v. 1 |>. 154 

 t. 53 f. 2 I 1893 H. p., A. Della Valle in: F. Fl. Neapel, v. 20 p. 746. 



Body rather compressed, glabrous above. Hood prominent, postero- 

 antennal corners not produced. Side-plates 1 — 3 with small tooth at lower 

 bind corner, setae few. Pleon segment 3, postero-lateral angles slightly 

 upturned in rather short spiniform process. Antennae 1 aud 2 comparatively 

 slender. Gnatliopods 1 and 2, palm about equal to bind margin in 6^^ Joint. 

 Peraeopod 4 rather slender, about half length of body. Peraeopod 5, 2*^ Joint 

 obliquely expanded, overlapping 4*^ Joint, hiud margin coarsely seiTate with 

 5 or 6 unequal downward directed points. üropod 3 in 9 small, inner ramus 

 longer than 1^* Joint of outer, outer with 2 spines on outer margin, 2*^ Joint 

 half as long as 1^*. Telson small, broader than long, apices very obtuse 

 and divergent. Colour greyish white, pellucid. L. 9 4 mm. 



Arctic Ocean, North-Atlantic, North-Sea and Skagerrak (Norway, Bohuslän). 



4. H. serrata 0. Sars 1879 H. s., G. 0. Sars in: Arch. Naturv. Kristian., t>. 4 

 p.445 ! 1885 H. s., G. 0. Sars in: Norske Nordhavs-Exp., r. 6 Crust. I p. 162 t. 13 f. 8, 

 8a— d I 1891 H.8., G. 0. Sars, Crust. Norway, v.l p. 155 t. 54 f . 1 j 1893 H. s., A. Della 

 Valle in : F. Fl. Neapel, v. 20 p. 747 t. 60 f. 18. 



Body robust, broadly vaulted. Hood rather convex with blunted tip. 

 Side-plates without tooth at lower bind corner, setae many, 1^* much 

 widened distally, 5**1 with bind lobe unusually deep. Pleon segments 1 — 3 

 dorsally hirsute, postero-lateral angles of 3*^ with spiniform process slightly 

 upturned. Antenna 1, 1^* Joint of peduncle unusually large, flagellum rather 

 Short, 5-jointed, accessory flagellum 4-jointed. Antenna 2 strong, flagellum 

 Short, 5-jointed. Gnathopods 1 and 2, palm of 6*^ Joint about equal to bind 

 margin. Peraeopod 4 very slender, and much more than half length of 

 body. Peraeopod 5, 2*^ Joint obliquely oval, overlapping 4*^, bind margin 

 cut into 5 very large backward directed points. üropod 3 in 9 , inner ramus 

 much shorter than 1^* Joint of outer, which has 4 spines on outer margin, 

 the 2*^ Joint minute with long apical setae. Telson broader than long, 

 apices obtuse, not very divergent. Colour greyish white. L. 9 6 mm. 



Arctic Ocean (Jan Mayen; Norway?). 



5. H. excavata Chevreux 1887 H. e., Chevreux in : Bnll. Soc. zool. France, 

 a 12 p. 568 ; 1893 H. neglecta (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 747. 



Body elongate. Hood almost straight. Pleon segment 3, postero- 

 lateral angles strongly produced, acutely curved upward. Antenna 2, 

 penultimate Joint of peduncle with 2 rows of strong spines. Gnathopod 1, 6*^ 

 Joint long oval, palm crenulate, defined by a spine. Gnathopod 2, 6**^ Joint 

 more broadly oval, palm defined by a long sharp tooth, with another 



