154 



Gitanopsis 



Synopsis of species: 

 J Pleon Segments 1 and 2 dorsally produced to a tooth 1. G. bispinosa 

 I Pleon Segments 1 and 2 not dorsally produced — 2. 



f Gnathopods 1 and 2 strong, very unequal 2. G. inermis . 



\ Gnathopods 1 and 2 weak, not very unequal ... 3. G. arctica . . 



p. 154 



p. 154 

 p. 155 



1. G. bispinosa (Boeck) 1871 Amphilochus b., A. Boeck iu: Forh. Selsk. 

 Christian., 1870 p. 131 | 1876 A. bispinosns, A. Boeck, Skand. Arkt. Amphip., v.2 p.435 

 i. 10 f. 1 1 1892 Gitanopsis bispinosa, G. ü. Sars, Crust, Norway, v. 1 p. 224 t. 76 f. 2 { 

 1893 G. b., A. Della Valle in: F. Fl. Neapel, v. 20 p. 598 t. 59 f. 6, 7. 



Head, rostrum ratber short, lateral corners produced, scarcely obtuse. 

 Side-plates not very large, 1^* very partially eoncealed, tapering to an 

 obtuse denticulated point, 2^ finely serrate od truncate distal marginr. 

 Pleon Segments 1 and 2, produced dorsally to a spiuiform recurved process, 

 Segment 3, postero-lateral corners quadrate. Eyes rouuded oval, light red. 

 Antennae 1 and 2 rather long. Antenna 1, P* Joint scarcely longer than 2^, 

 flagellum nearly twice as long as peduncle, with 15 joints, each with fascicle of 

 delicate sensory setae. Antenna 2 ratber longer, slender, ultimate and pen- 

 ultimate joints of peduncle subequal, flagellum 15- or 16-jointed. Gnatbopods 1 

 and 2 ratber feeble, not very unequal, ö*'^ Joint scarcely narrower tban Q^^, 

 tbe lamellar setose lobe not quite reaching tbe palm even in guatbopod 2, 

 6*^ Joint oval, about twice as long as broad, palm convex, very oblique, not 

 defined by any distinct angle, witb small denticles and bristles on eitber 

 side of it, finger birsute. Peraeopods 1 — 5 slender, spinulose. in B"^— 5*^ pairs 

 2^ Joint well expanded, especially in peraeopod 5. Uropods 1 — 3, rami 

 densely spinulose, uropod 3 reacbing as far as uropod 1, peduncle scarcely 

 longer tban rarai. Telson conically tapering, not reaching end of peduncle 

 of uropod 3. Colour wbitish, banded witb ligbt red. L. Q 5-5 mm. 



Arctic ücean, North- Atlantic, North-Sea and Skagerrak (Norway, depth 94 — 188m ; 

 Oreenland; France; Great Britain). 



2. G. inermis (0. Sars) 1882 Amphilochus L, G. 0. Sars in: Forh. Selsk. Christian., 

 nr. 18 p.87 t. 3 f. 10 | 1892 Gitanopsis i., G. O. Sars, Crust. Norway, v.l p. 225 t. 77 

 f. 1 j 1893 G. l, A. Della Valle in: F. Fl. Neapel, v. 20 p. 598 t. 59 f. 8. 



Head, rostrum strongiy curved, lateral corners nearly 

 quadrate. Side-plate 1 very small, obliquely quadrangular, 

 2"^ sligbtly expanded, distal margin rounded, coarsely 

 dentate. Pleon segment 3, postero-lateral corners sub- 

 quadrate. Eyes ratber large, rounded oval. Antennae 1 and 2 

 ratber sbort. subequal. Antenna 1, l''* and 2'* joints equal, 

 flagellum 6-jointefl, raucb sborter tban peduncle. Antenna 2, 

 ultimate and penultimate joints of peduncle equal, flagellum 

 scarcely balf lengtb of peduncle. Gnathopods 1 and 2, 

 resembling those of Amphilochus (p. 149), rather powerful, 

 6^^ Joint widening to a convex, sligbtly oblique, denticulate 

 palm, which is a little overlapped by tbe flnger. In gnatho- 

 pod 1, process of 5*^ Joint not very long, palm detined by 

 2 slender spines ou eacb side. Gnathopod 2 much larger than 

 gnatbopod 1, process of 5*^ Joint long, slender, nearly reaching palm, which 

 bas a dense series of small bairs. Uropod 3 scarcely reaching so far back 

 as uropod 1, peduncle ratber longer tban tbe smooth rami. Telson longer 

 than peduncle of uropod 3 (Fig. 39), tapering uniformly to acute apex. 

 L. 5 under 4 mm. 



Varangerfjord (Vadsö [Finmark]). Depth 38 — 94 in. 



-- /-- Telson 



-f- - Uropod 3 



Fig. 39. 

 G. inermis. 



Telson and 



uropod 3. 



lAfter G.G. Sars.] 



