118 Haploops, Haustoriidae 



Fascicles of long- slender setae rising from dorsal end of peraeon 

 Segments 5 — 7 and pleon segments 1 — 3. Head with lower corners distinctly 

 angular. Postero-lateral angies of 3*^ pleon segment veiy slightly produced. 

 Patches of reddish pigment in the position of the abseut corneal lenses. 

 Autenua 1 more than half as long as body, 2'^ Joint of pedunclo much 

 longer than P^ flagellum 24-jointed, twice as long as peduncle; antenna 2 

 subequal to antenna 1, ultimate and penultimate joints of peduncle subequal. 

 Guathopod 1, 6^^^ Joint distally narrow. Peraeopod 5, 2^ Joint broad, hind 

 luargin straight, lower lobe broad, descending rauch below the 3'\ the 

 expansion ou surface and raargin being deusely setose, 4**' and b^^ joints 

 subequal, 5^'^ not equalling in length the naiTow 6*'' and 7*'^ joints combined. 

 Uropod 1 slightly armed, inner ramus ^ length of outer; uropod 2 with rami 

 much shorter than those of uropod 3, which are foliaceous and setose, the inner 

 and shorter carry ing 2 spiues. Telson about as long as broad, cleft scarcely 

 beyond the middle, tapering to an almost acute apex. Colour gi-eyish white, 

 with brownish in testine. L. 9 13 mm. 



Arctic Ocean ; North- Atlantic, North-Sea and Skagerrak (South- and West-Norway). 



5. H. robusta ü. Sars 1891 H. r., G. 0. Sars, Crust. Norway, v. 1 p. 195 t. 68 

 f. 2 11893 JET. >•., H.setosa?, A. DellaValle in: F. FI. Neapel, f. 20 p. 907, 932 j 1894 

 H. r., T. Stebbing in: Bijdr. Dierk., v. 17 p. 18. 



Perhaps not distinct from H. setosa. Fascicles of setae as in H. setosa. 

 Head - with lower angies more or less rounded. Postero-lateral angies of 

 3*^ pleon segment not produced. Corneal lenses wanting. Antenna 1 in 

 the type speciraen less than half length of body, with 2*^ Joint of peduncle 

 little longer than 1^*, but soraetimes little differing from the proportions 

 in H. setosa; flagellum soraetimes consisting of 33 joints; antenna 2, flagellum 

 soraetimes of 30 joints. Peraeopod 5 as in H. setosa, but 4'^^ and 5**' joints 

 rather longer in proportion to breadtli. Uropod 3 with 3 spines on the 

 inner ramus. Telson rather longer than broad, cleft almost to the base. 

 L. reachiug 22*5 rara. 



Arctic Ocean (Finmark, and between lat. 72'' and 76" X., long. 16** and 54^ E.). 



4. Farn. Haustorüdae 



1882 Ponfoporeiidae, G. 0. Sars in: Forh. Selsk. Christian., nr. 18 p. 22 j 1888 

 F.. T. Stebbing in: Rep.Voy. Challenger, v.29 p. 804 1891 F., G. O. Sars, Crust. 

 Norway, v. 1 p. 121. 



Head seldora rostrate. Side-plates of moderate size, generally fringed 

 with setae, side-plate 5 bilobed. Antenna 1 (Fig. 30, 32) usually shorter 

 than antenna 2 (Fig. 31, 33), with accessory flagellura, joints of peduncle 

 sharply deflned. Epistome not projecting. Upper lip with rounded margin. 

 lower lip quadrilobate. Mandible with dentate cutting edge, accessory plate. 

 prominent and large molar, palp 3-jointed. .Maxillae 1 and 2 (Fig. 34) and 

 maxillipeds usually but not always normal. Gnathopods 1 and 2 seldom powerful, 

 weakly subchelate or chelate. Peraeopods 3 — 5 (Fig. 35, 36) varied, ofteu 

 adapted for burrowing. Branchial vesicles siraple. Pleopods as a rule well 

 developed, especially in ö . Uropods 1 — 3 biraraous, uropod 3 unlike uropods 1 

 and 2. Telson flattened, more or less deeply cleft. 



Marine; also in brackish and fresh water. 

 8 genera, 21 accepted, 5 doubtful species. 



