Bathyporeia 1^1 



peduncle, in ö about as long as the body. Gnathopod 1, 6^^^ Joint oblong- 

 oval, somewbat sborter than 5'^^^ Peraeopods less setose. üropod 3, 1^* Joint 

 of outer ramus scarcely dilated distally, 2*^ nearly half as long, and in o 

 without lateral setae. Telson with about 6 apical spines and 2 lateral on 

 each half. Body pellucid, nearly colourless. L. scarcely more than 5 mm. 



Arctic Ocean, North-Atlantic, North-Sea, Skagerrak and Kattegat (Scandinavia, 

 France, Great Britain). 



3. B. gracilis 0. Sars 1891 B. rj., G. O. Sars, Crust. Norway, v. 1 p. 132 t. 45 

 f. 1 I 1893 B.jnlosa (part.), A. DellaValle in: F. Fl. Neapel, «.20 p. 752. 



Rather slender though not much compressed; head about as long as 

 peraeon segments 1 and 2. Side-plate 1 rather narrow, obtusely pointed, 2^ and 

 (?) 3"^^ with tooth. Pleon segment 3, angles rounded, without tooth; segment 4 

 not deeply depressed and carrying 2 pairs of spinules. Eyes imperfectly 

 developed, and not at all visible in spirit speciraens. Antenna 1, flagellum 

 in Q with 6, in ö with 8 joints; accessory flagellum, 2*^ Joint scarcely more than 

 ■^/g length of 1®*, which has spinules only on outer edge. Antenna 2 in 9 twice as 

 long as antenna 1, flagellum slender, subequal to last 2 joints of peduncle. 

 8-jointed ; in d scarcely longer than in 9 , flagellum with 13 joints. distinct calceoli 

 on the ttrst 5. Gnathopod 1. 6^^^ Joint regularly oval, much shorter than 5*''. 

 Peraeopods 3 — 5 much more slender than in any of the other species knowu, 

 4^1' Joint little expanded in peraeopod 3 and scarcely as long as 5^^ and 

 6*'* combined; 5^*^ and 6**^ very elongate and naiTOw in peraeopods 4 and 5. 

 Uropod^3, 2^ Joint of outer ramus about Vs length of 1^*, both margins 

 smooth. Each half of telson rather narrow, with 4 apical spines and 

 2 lateral. L. about 6 mm. 



North-Atlantic (West-Norway). From rather deep water. 



4. B. robertsoni Bäte 1862 B. r., Bäte, Cat. Amphip. Brit. Mus., p. 173 t. 31 f. 5 

 1891 B. robertsonii, G. O. Sars, Crust. Xorway, ul p.l31 t. 44 f. 2 | 1893 B. robertsoni, 

 T.Scott in: Rep. Fish. Board Scotl., t;. 11 p. 213 t. 5 f. 26— 29 j 1875 B. pilosa (part.), 

 T. Stebbing in: Aun. nat. Hist., ser. 4 r. 15 p. 74 i 1893 B. p. (part.), A. DellaValle 

 in: F. Fl. Neapel, t'.20 p. 752. 



In general agreement with B. pelagica. Pleon segment 4 without dorsal 

 spinules. Eyes rather large. oblong oval or reniform, very dark. Antenna 1 

 in (5, flagellum 9-jointed: accessory flagellum, 2*^ Joint extremely small, 

 l*** with group of spinules in middle of inner margin. Antenna 2 in adult ö 

 scarcely more than half length of body, flagellum about twice as long as 

 peduncle, with 17 joints, the first 15 each with rather large calceolus. Gnatho- 

 pod 1, 6*'i Joint ovate, about as long as 5*^ finger hook-like. üropod IJ. 

 2^^ Joint of outer ramus scarcely more than I4 length of 1^*, which is ratlier 

 expanded. L. 6 mm. 



Arctic Ocean, North-Atlantic and North-Sea (Finmark, Great Britain, France). 



5. B. pilosa Lindstr. 1855 B. p.,' Lindström in: Öfv. Ak. Förh., ».12 p. 59 t. 2 

 f. 1-11 ; 1891 B.p., G. 0. Sars, Crust. Norway, v.\ p. 133 t.45 f.2 j 1893 B. p. (part.), 

 A. DellaValle in: F,FJ. Neapel, v.20 p. 752. 



In general agreement with B. pelagica. Pleon segment 4 slightly impressed 

 and with no dorsal spines behind the forward curving setules. Eyes in o small, 

 rounded oval, in ö somewbat larger, blackish. Antenna 1, 1^* Joint scarcely 

 twice as long as 2*^ and 3*i combined, flagellum in Q 6-, in ä 12-jointed; 



