Pandorites, Pherusa 449 



2*^ Joint tipped with setules, inner ramus less than '/„ as long as outer, 

 with 1 apical seta. Telson little longer than peduncle of uropod 3, broader 

 than long, lobes not divergent, a spine and hair on each broad apex. L. O 11, 

 ö 13 mm. 



Caspian Sea. Dejjth 13 — 90 m. 



38. Gen. Pherusa Leach 



1813 14 Pherusa (Sp. un.: F. fucicola), Leach in: Edinb. Euc, v.l p. 432 \ 1891 

 P., A. 0. Walker in: Ann. nat. Hist., ser. 6 v.7 p.418; u8 p. 81 | 1891 P., Pocock in: 

 Ann. nat. Hist., ser. 6 v.l p. 530 | 1857 GammareUa (Sp. un.: G. orchestifofmis), Bäte 

 in: Ann. nat. Hist., ser. 2 u 19 p. 143 | 1893 G., G. 0. Sars, Crust. Norway, v.l p. 446. 



Body smooth. Head without acute rostrum. Antenna 1 the longer, 

 2*^ Joint of peduncle elongate, accessory flagellum developed. Upper lip smoothly 

 rounded. Lower lip with inner lobes. Mouth-organs normal. Mandibular palp 

 slender. 2*^ and 3^ joints elongate. Maxiila 1, inner plate with about 18 setae, 

 €uter with 11 spines. Maxiila 2, inner margin of inner plate fringed with setae. 

 Gnatliopods 1 and 2 subchelate. Gnathopod 2 differing greatly in the two 

 sexes. Peraeopods 1 and 2 slender. Peraeopods 3 — 5 with 2^ Joint expanded, 

 especially in peraeopod 5. Uropods 1— -3 short. Uropod 3, outer ramus 

 little longer than peduncle, inner much shorter. Telson deeply cleft. 



1 species. 



1. P. fueicola Leach 1813 14 P. f., Leach in: Edinb. Enc, r. 7 p. 432 | 1816 

 P.f., Leach in: Enc. Brit., ed. 5 suppl. 1 p. 426 t. 21 f. | 1862 P. f. (part.), Bäte & 

 Westwood, Brit. sess. Orust., v. 1 p. 255 f. z dorsal view | 1893 Melita f., A. Della Valle 

 in: F. Fl. Neapel, ?;.20 p. 709 t. 1 f. 8; t. 24 f. 1—19 I 1898 M. f., Sowinski in: Mem. 

 Soc. Kiew, V.15 p. 486 t. 11 f. 10— 19; 1. 12 f. 1—4 | 1830 Gammarus brevicaudus -\- 

 Amphithoef., H. Milne Edwardsin : Ann. Sei. nat., r. 20 p. 369 ; p. 377 j 1840 G. brevicaudatus, 

 H. Milne Edwards, Hist. nat. Crust., v. 3 p. 53 | 1857 Amphithoe micrnra -(- A. semi- 

 carinata -j- G. obtnsunguis (part.: "ö juv.) -|- G. punctimanus, A. Costa in: Mem. Acc. 

 Napoli, v.l p.209 t.3 f.2; p.210 t.3 f. 3; p.219 t.3 f.8; p.222 t.3 f.6 | 1857 GammareUa 

 orchestiformis, Bäte in: Ann. nat. Hist., ser. 2 ».19 p. 143 j 1862 G. normanni (?), 

 Bäte & Westwood, Brit. sess. Crust., v. 1 p. 333 | 1862 G. brevicaudata -\- Gammarus 

 pundatus {\&Tps., corr. : G. pimcti»t,a?ms). Bäte, Cat. Amphip. Brit. Mus., p. 180 t. 32 f. 8; 

 p. 224 ! 1874 GammareUa b., T. Stebbing in: Ann. nat. Hist., ser. 4 v. 14 p. 13 t. 2 f. 3a— g | 

 1888 G. b., T. Barrois, Cat. Crust. Agores, p.47 t. 4 f. 5—12 | 1889 G. b., A. M. Norman 

 in: Ann. nat. Hist., ser. 6 «7.4 p. 128 | 1885 G. longicornis, R. Koehler in: Bull. Soc. 

 Nancy, v. 17 p. 67. 



Pleon abruptly depressed and abbreviated behind segment 4, which is 

 more or less obtusely carinate but not at all dentate, segments 5 and 6 with 

 a couple of minute dorsal spinules. Eyes sraall, round, tinged with red. 

 Antenna 1, 2^ Joint nearly as long as 1^*, flagellum longer than peduncle, 

 sometimes nearly twice as long, accessory flagellum with 4 tolerably long 

 joints. Antenna 2 much shorter, slender, ultimate Joint of peduncle rather 

 shorter than penultimate, flagellum about 20-jointed, subequal to peduncle. 

 Gnathopod 1, 6*^^ Joint shorter than 5*^, widening somewhat to the palm, 

 which is almost ti'ansverse, matching the short finger. Gnathopod 2 in 9 , 

 0^^ Joint longer than 5*^, not widening, palm short, transverse, finger short. 

 Gnathopod 2 in d very unlike that of Q , 5*^ Joint very short, 6*^ very 

 large, almond-shaped, narrowest at the finger-hinge, the long oblique palm, 

 except in the young form, scarcely at all distinct from the bind margin, fringed 

 with setae and carry ing within the margin a row of spinules, finger very 



Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 29 



