Rhachotropis 353 



9. R. leucophthalxaa 0. Sars 1893 B. l. 0. 0. Sars, Crust. Norway, v. 1 

 p. 429 t. 151 f. 2. 



Rather less slender than R. macropus, otherwise like it in general. 

 Peraeon segmeuts 1 — 7 witbout teeth, pleon as in R. macropus, but tooth 

 of 4*^'^ Segment uniisually large. Head, lateral corners very narrow. Side- 

 plates as in R. macropus. Eyes quite rudimentary, represented by 2 irregulär 

 yellowish white patches of pigment Antenna 1 not very long, 1^* Joint 

 subequal to 2'^, 3^ more than haljf as long as 2^, flagellum subequal to peduncle; 

 accessory flagellum 2-jointed, Antenna 2 a little longer, ultimate Joint of 

 peduncle longer than penultimate, flagellum not nearly as long as both combined. 

 Gnathopods 1 and 2 rather powerful, similar to those of R. macropus, as 

 also peraeopods 1 — 5, but peraeopod 5 shorter than the body. Uropods 1 — 3 

 as in R. macropus, telson shorter, not extending beyond uropod 3, more 

 tapering distally, cleft to the centre. Colour light yellowish, tinged with 

 reddish orange, and pinkish on mouth-parts and gnathopods 1 and 2. 

 L. Q 14 mm. 



North- Atlantic, North-Sea and Skagerrak (Norway). Depth 188 — 752 m. 



10. E.. rostrata (Bonnier) 189G Rachotropis r., J. Bonnier in: Ann. Univ. Lyon, 

 V. 26 p. 653 t. 39 f. 2. 



Peraeon segments 1 — 7 smooth, not produced, pleon segmeut 1 slightly 

 carinate behind, without lateral carinae, segments 2, 3 and 4 tricarinate, 

 carinae produced into teeth on segment 2,' ending obtusely on segment 3, 

 the central produced into a tooth on segment 4. Head, rosti'um reaching 

 along -/g length of 1^* Joint of antenna 1, slightly deflexed. lateral corners 

 produced to a truucate lobe. Side-plates of the usual form; pleon segment 3, 

 postero-lateral margins cut into 10 sharp teeth. Eyes entirely wanting. Antenna 1 

 in ö, 1^* Joint as long as 2^ and 3*^ combined, 2"^ calceoliferous, 3<^ less 

 than half as long as 2*^, flagellum much louger than peduncle. with 20 joints, 

 Xst ygpy long, densely clothed, accessory flagellum wanting. Antenna 2 much 

 longer, ultimate and penultimate joints of peduncle subequal, calceoliferous, 

 flagellum longer than peduncle, with 40 elongate joints. Maxilla 1, inner plate 

 with only 1 seta, outer with 8 spines. Gnathopods 1 and 2 nearly as in 

 R. helleri (p. 351), but 5*^ Joint with lobe apparently very little produced, 

 palmar angle set with 3 strong spines. Peraeopods 1 — 5 slender, elongate, 

 2^ Joint of peraeopod 5 broad proximally. Uropods 1 and 2, outer ramus 

 rather the shorter; uropod 3, rami lanceolate, equal; all rami minutely spinulose. 

 Telson tapering, not reaching extremity of uropod 3, carrying a pair of 

 plumose cilia above the centre of lateral margins, cleft less than ^^ of lengih. 

 L. 13 mm. 



Bay of Biscay. Depth 950 m. . ^ 



11. R. gracilis (Bonnier) 1896 Rachotropis g., J. Bonnier in: Ann. Univ. Lyon, 

 V. 26 p. 657 t. 39 f. 3. 



Body compressed, dorsally carinate on peraeon segments 1 — 7 and pleon 

 segments 1 — 4, carina produced into a small tooth only on pleon segments 1 — 4 

 (in text: on segments 1 — 3), no lateral carinae. Head, rostrum very shoi*t, 

 lateral angles apparently acute, little produced. Side-plate 1 (in figure) not 

 produced forward. Pleon segment 3, postero-lateral margins with only 3 

 scarcely visible denticles. Eyes wanting. Antenna 1 in d short, 1^*^ and 

 2^ joints long, equal, 3'^ much less than half as long as 2^, flagellum shorter than 



Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 23 



