Harpinia 141 



{Side-plates 13 with few setae, a tooth at lower 

 hind Corner 3. H. pectinata . . p. 142 

 Side-plates 1 — 3 with many setae, no tooth at 

 lower hind corner 4. H. serrata . . . p. 142 



\ Grnathopod 2. palm bidentate 5. H. excavata . . p. 142 



) Gnatliopod 2, palm not bidentate — 7. 



( Head with postero-antennal Corners muchproduced 6. H. antennaria. . p. 143 

 7 < Head with postero-antennal corners not much 

 I produced — 8. 



IPleon Segment 3, postero-lateral corners produced 

 into a small tooth 7. H. propinqua . . p. 143 

 Pleon Segment 3, postero-lateral corners produced 

 into a large tooth — 9. 

 / Side-plates 1 — 4, setae on lower margin close-set 



and numerous 8. H. obtusifrons . p. 143 



9 



\ Side-plates 1 — 4, setae on lower margin not close- 



set or numerous 9. H. plumosa . . . p. 144 



I Peraeopod 5, 2d Joint with hind margin obliquely 



10 ^ truncate below 10. H. truncata . . . p. 144 



I Peraeopod 5, 2d Joint with hind margin rounded — 11. 



I Pleon Segment 4 with dorsal hump 11. H. abyssi .... p. l44 



l Pleon segment 4 without dorsal hump 12. H. laevis . . . . p. 145 



1. H. mucronata O. Sars 1879 H. tn., G. O. Sars in: Arch. Naturv. Kristian., 

 ».4 p. 446 I 1885 H. ni., G. 0. Sars in: Norske Nordhavs-Exp., uH Grust. I p. 161 t. 13 

 f. 7, 7a— g I 1891 H. m., G. O. Sars, Crust. Norway, vA p.l57 t.54 f. 3 | 1893 H.m., 

 A. Della Valle in: F. Fl. Neapel, v. 20 p. 746 t. 60 f. 17. 



Body rather compressed, giabrous above. Hood promineut, slightly 

 convex. Side-plates 1 — 3 with small tooth at lower hind corner, setae few. 

 Pleon segment 3, postero-lateral angles slightly upturned in long spiniform 

 process. Antennae 1 and 2 comparatively slender, accessory flagellum nearly 

 as long as principal. Gnathopods 1 and 2, palm slightly longer than hind 

 margin in ü^^ Joint. Peraeopod 4 not very slender, scarcely more than 

 half the length of the body. Peraeopod 5 (Fig. 38) very small, 2*^ Joint 

 less expanded than usual, lower hind corner carrying a strong backward- 

 pointing acute spur, with a slight excavation above it and a few points of 

 serration below. üropod 3, inner ramus as long as 1^* Joint of outer, 2*^ 

 Joint of outer not nearly half as long as P*. Telson broader than long, 

 apices very obtuse. Colour greyish white. L. 9 5 mm. 



Arctic Ocean and North- Atlantic (Finmark, Greenland), North-Sea. 



2. H. crenulata (Boeck) 1871 Harpinac, A. Boeck in: Forh. Selsk. Christian., 

 1870 p. 136 ! 1876 Harpinia c, A. Boeck, Skand. Arkt. Amphip., v. 2 p. 221 t. 8 f. 2 | 

 1891 H. c, G. 0. Sars, Crust. Norway, v.l p.l58 t.55 f. 2 | 1893 H. c. (part.), A. Della 

 Valle in: F. Fl. Neapel, ??. 20 p. 745 | 1896 H. nana, J. Bonnier in: Ann. Univ. Lyon, 

 v.2(i p. 633 t. 37 f. 2. 



Body rather short and stout. Hood prominent. Side-plates, setae not 

 numerous. Pleon segment 3, postero-lateral angles rounded, with a little 

 upturned, scarcely projecting denticle above, the margin below it sometimes 

 crenulate; segments 1 — 3 dorsally densely hirsute; segment 4 with dorsal 

 depression in ö. Antenna 1, flagellum 6-jointed, accessory flagellum 5-jointed. 

 Antenna 2, flagellum 5-jointed. Gnathopods I and 2, palm longer than hind 

 margin of 6*^ Joint, especially in the more robust gnathopod 2. Peraeopod 4 

 slender, ^4 length of body. Peraeopod 5, 2^ Joint with expansion not 



