Orchomenella, Orchomenopsis 



83 



depression. Eyes oval, slightly widened below, light red. Antenna 1, flagellum in 

 9 with 10 joints, accessoiy flagellum with 4 or 5. Antenna 2 in Q little longer 

 than antenna 1, flagellum with 10 — 12 joints, mucli longer in d. Epistome 

 slightly projecting in front of upper lip, evenly rounded. Gnathopod 1 not 

 robust, 6^'> Joint scarcely longer than o*^ palm very slightly oblique. Gnatho- 

 pod 2, palm produced beneath the minute finger. Peraeopods 3 — 5 unusually 

 Short, 2*^ Joint large, as long as rest of limb, 7*^^ Joint very small. üropod 3, 

 inner ramus as long as basal Joint of outer, which in 9 has 1 seta on inner 

 margin. Telson nearly twice as long as broad, carrying 2 pairs of marginal 

 spinules, cleft extending beyond the centre, apicaUy dehiscent. Colour pale 

 yellowish red, with orange speck at corners of each segment. L. Q 6 (Sars), 

 reaching 11 mm (Ohlin). 



Arctic Ocean, North-Atlantic, North-Sea and Skageri-ak (whole Norway). British 

 and Mediterranean localities remain doubtful. Depth 2 — 112 m. 



5. O. groenlandiea (H. J. Hansen) 1887 Anonyx groenlandicus, H. J. Hansen 

 in: Vid. Meddel, ser. 4 v.9 p. 72 t. 2 f. 5— Sg] 1893 A. g., A. Della Valle in: F. Fl. 

 Neapel, v. 20 p. 832 j 1891 & 95 Orchomenella groenlandiea, G. O. Sars, Crust. Norway, 

 V. 1 p.70 t. 26 f. 1; p. 684 [ 1893 Orchomene g., J. Bonnier in: Bull. sei. France Belgique, 

 V. 24 p. 194. 



Head, lateral corners slightly projecting, subangular (Sars), rounded 

 (Hansen). Side-plate 1 narrowed below, 5*^^ broader than deep, not produced 

 behind. Pleon segment 3, angles upturned, acute, 4*^^ with deep depression and 

 low carina ending acutely. Eyes oval, widened below, Visual elements imperfectly 

 developed, pigment dark red with opaque white coating. Antenna 1, flagellum in 

 9 with 8, in ö with 14 joints, P* rather large, accessory flagellum with 4 joints, 

 1^* long. Antenna 2 in Q scarcely longer than antenna 1, not nearly twice as 

 long in ö . Epistome considerably projecting in front of upper lip (as in Orcho- 

 mene, p.44), evenly rounded. Mandible rather stout. Gnatho- 

 pod 1, 6*^ Joint longer than 5*^^, scarcely taperiug, palm ti'ans- 

 verse. Gnathopod 2 subchelate, 6*^ Joint half length of 5*^, 

 slightly produced at angle of palm. Peraeopods 3—5 of 

 moderate length, 2^ Joint large, 4*^ little widened. üropod 2, 

 inner ramus constricted. üropod 3, inner ramus in 9 nearly as 

 long as outer, in ö somewhat larger, with both rami setose on 

 inner margin. Telson oblong oval, nearly twice as long as broad, 

 with 2 pairs of marginal spinules, cleft naiTOw, extending beyond 

 the centi'e. Colour whitish, j)ellucid. L. 7 mm. 



Arctic Ocean. Depth 19 — 94 m. 



49. Gen. Orchomenopsis 0. Sars 



1893 



1891 Orchomenopsis, Ct. 0. Sars, Crust. Norway, v. 1 p. 73 

 0.. J. Bonnier in: Bull. sei. France Belgique, u 24 p. 174. 



Head, lateral angl6s rounded. Side-plate 1 expanded 

 below, 4*^^ with rather short obtuse expansion. Pleon segment 3, 

 postero-lateral angles not produced. Antenna 1, peduncle 

 stout, 2^ and 3*^ joints very short, accessory flagellum well 

 developed. Antenna 2 notably longer than antenna 1. Epistome 

 not projecting. Mandible strong, molar weak, much ciliated, 

 palp set far back, its 1^* Joint short. Maxiila 1, 2 setae on naiTow 

 inner plate, 11 spines on broad obliquely truncate outer plate, many spine-teeth 

 on apex of palp. Maxiila 2, plates rather long and narrow, somewhat acuminate 



6* 



Fig. 14. 

 O. abyssorum. 



Pleopod with 

 retinacula. 



