Byblis 113 



distal angies roimded, cleft shoil Body pellucid, with dark violet intestine 

 Shilling tlirough the integuraent, sides mottled witb white. L. O 8 mm, or 

 slightly more. 



Arctic Ocean and North- Atlantic (Magerö and Bejan [Norway]). Depth 150 — 188 ni, 



miiddy bottom. 



2. B. abyssi 0. Sars 1879 B. a., G. 0. Sars in: Arch. Naturv. Kristian., v.A 

 I).456 ; 1885 JS. «., G. 0. Sars in: Norske Xordhavs-Exp., v.S Crust. I p. 201 1. 16 f. 6 j 

 1891 B. a., G. 0. Sars, Crust. Norway, v. 1 p. 189 t. 66 f . 2 | 1893 Ämpelisca gainiardii 

 <part.), A. DellaValle in: F. Fl. Neapel, ü. 20 p.472. 



Coraeal leiises waiiting. Antenna 1, peduiicle not nearly reaching end of 

 peuultimate Joint of peduncle of antenna 2, flagellum in 9 28-jointed, twice as 

 long as peduncle; ultimate Joint of peduncle of antenna 2 notably shoiier than 

 penultimate, antenna 2 ueaiiy twice as long as antenna 1. Peraeopod 5, 2^ Joint 

 broad, reaching a little below 4*^, front and lower edges in a continuous curve, 

 but almost quadrate, 5^'^ Joint as long as 3^^ and 4^^ combined, slightly 

 longer than 6^\ 7^^ Joint very short. Uropod 3, inner margin of inner 

 raiiius serratc, that of outer ramus almost smooth. Telson almost quadrate, 

 but broader than long, slightly narrowed distally, distal angies rounded, cleft 

 neaiiy obsolete. Colour whitish, pellucid. L. 9 12 mm. 



Arctic Ocean and North -Atlantic (West- and Northwest -Norway). Depth 

 <j59— 1186 m. 



3. B. gaimardii (Kroyer) 1846 Ämpelisia (laps., corr.: Ämpelisca) ff., Kreyer 

 in: Voy. Nord., Crust. t. 23 f. la — y | 1871 Byblis gaimardi, A. Boeck in: Forh. Selsk. 

 Christian., 1870 p. 228 | 1891 B. gaimardii, G. 0. Sars, Crust. Norway, v. 1 p. 183 t. 64 i 

 1893 Ämpelisca g. (part.), A. DellaValle in: F. FL Neapel, f. 20 p.472 t. 57 f. 39— 41 ! 

 1896 Byblis serrafa (err.?, non S. I. Smith 1873!), S. D. Judd in: P. U. S. Mus., v. 18 

 p. 596 f. 4—8. 



Corneal lenses large, lower pair occupying lower corners of front, 

 pigment brownish. Antenna 1, peduncle not reaching end of penultimate Joint of 

 peduncle of antenna 2, flagellum in o 20-jointed, twice as long as peduncle, 

 ultimate Joint of peduncle of antenna 2 shorter than penultimate. Peraeopods 1 

 and 2 having G^^^ and 7*^^ joints each much longer than the 5^^; peraeopod 5 with 

 2'^ Joint produced below the 4'^^ its front and lower edges defined by an obtuse 

 angle, 5*^ Joint as long as 3'^ and 4*'^ combined and rather longer than 

 the 6*^. Uropod 3 having the rami acute, with coufronted edges serrate and 

 a projecting corner near the base. Telson with nearly equal leng-th and breadth, 

 i'left very short. Colour whitish with ftiint orange markings, front of head 

 mottled with dark violet. L. 9 15, d rather less (Sars), reaching 23 mm (Ohlin). 



Arctic Ocean, North-Atlantic and North-Sea (whole West-Norway) ; Christiauia- 

 fjord; Kattcgat. Depth 37 — 150 m. 



4. B. longicornis 0. Sars 1891 B. l., G. 0. Sars, Crust. Norway, v. 1 p. 185 

 t. 65 f . 1 i 1893 Ämpelisca gaimardii (part.), A. DellaValle in: F. FL Neapel, r. 20 

 p. 922 ] 1894 Byblis intermedius, T. Stebbing in: Bijdr. Dierk., t". 17 p. 18. 



Corneal lenses smaller than in B. gaimardii, lower pair removed from lower 

 corners of front, pigment light brown. Antenna 1, peduncle usually reaching 

 end of penultimate Joint of peduncle of antenna 2, flagellum in 9 27 — 35-jointed, 

 twice as long as peduncle; ultimate and penultimate joints of peduncle of antenna 2 

 subequal; both pairs longer than in B. gaimardii. Peraeopods 1 and 2 having 6^^' 

 Joint not much longer than S'^i; peraeopod 5 with 2^^ Joint not produced 

 below the 4*'', its front and lower edges in a continuous cm've, 5*'' Joint 

 scarcely as long as 3^ and 4*^ combined and shorter than the 6^^. Uropod 3 

 with rami acute and confi'onted edges seiTate, but without projecting corner near 



Das Tierreich. 21. Lief.: T. R. R. Stebbiug, Amphipoda I. 8 



