Urothoe 129 



Body robust. Head slightly produced, sides triaugular downward below 

 the antennae. Side-plates not large. Gland-cells numerous. Autenna 1, 

 joints of peduncle not veiy unequal, flagellum and accessory flagellum very 

 Short. Antenna 2, peduncle spinöse, ultimate Joint in d with calceoli, flagellum 

 in o 2- or 3-jointed, in d long, many-jointed, with calceoli. Upper lip rounded. 

 Mandible, cutting edge scarcely denticulate, accessory plate small, spine-row 

 wanting, molar strong, palp sleuder, 1^* Joint not short, 3*^ as long as or longer 

 than 2*^. Maxiila 1, inner plate slight, number of setae small, variable, 

 outer plate with 11 spines, 2*^ Joint of palp equal to or longer or sborter 

 than 1^*, with 3 apical setae. Maxilla 2, inner plate with armature on 

 inner margin, outer rather the broader. Maxillipeds, plates of moderate 

 size, outer fringed with spines, 2*^ Joint of palp produced, 3"^ club-shaped, 

 ■4* slender. Gnathopods 1 and 2 similar, weakly subchelate, 6*^ Joint shorter 

 than 5*^; finger longer in gnathopod 1 than in gnathopod 2. Peraeopods 1 and 2, 

 4*^^ Joint longer than either 5*'i or 6*^, both of which are strongly spined. 

 Peraeopod 3, joints 2 — 5 dilated, 2^ quadrate, joints 4 — 6 strongly spinöse, 

 Joint 5 as wide as or wider tban 4*^; peraeopod 4 the longest; peraeopods 4 and 5, 

 2^ Joint oval, others not expanded. All the legs have a cap over finger-tip. 

 Peraeopods 1 — 5, finger nodulous or seiTulate. Pleopods, inner ramus the 

 shorter. üropods 1 and 2, rami narrow. üropod 3, rami foliaeeous, not very 

 unequal, setose especially in d. Telson cleft nearly to base. As a rule 

 peraeopods 1 and 2 have a row of setae on outer surface of joints 4 and 5; 

 there are long plumose setae in peraeopod 3 on inner distal margin of 

 joints 4 and 5 and on inner surface of Joint 6, in peraeopod 4 on inner 

 surface of 2*^ Joint and bind margin of 4*^ in pleon segment 2 on lower 

 inner surface. 



7 species accepted, 3 obscure. 



Synopsis of the accepted species: 



) Without eyes 1. U. abbreviata . p. 129 



j With eyes — 2. 



I Uropod 1, rami strongly cur\ed 2. U. marina . . . p. 130 



) üropod 1, rami not strongly curved — 3. 



) Peraeopod 3, 5th Joint extremely broad — 4. 



) Peraeopod 3, 5th Joint not extremely broad — 5. 



I Üropod 3, inner ramus longer than outer .... 3. U. grinaaldii . . p. 130 



) Üropod 3, inner ramus shorter than outer .... 4. U. pulchella . . p. 130 



. I üropods 1 and 2 strongly armed 5. U. poucheti . . p. 131 



) Üropods 1 and 2 weakly armed — 6. 



j Antenna 1, accessory flagellum long 6. U. brevicornis . p. 131 



\ Antenna 1, accessory flagellum short 7. U. elegans . . . p. 131 



1. U. abbreviata 0. Sars 1879 U. a., G. 0. Sars in: Arch. Naturv. Kristian., 

 v.i p. 44ö I 1885 U. a., G. O. Sars in: Xorske Nordhavs-Exp^, ».6 Crust. I p. 164 t. 14 

 f. 1 I 1891 U.a., T. Stebbing in: Tr. zool. Soc. London, v.V6i p.3, 9 | 1893 U. irrostrata 

 (part.), A. DellaValle in: F. Fl. Neapel, ».20 p. 664. 



Body remarkably short and thick-set. Pleon segment 3, postero-lateral 

 Corners quadrate. Eyes wanting. Antenna 1 much longer than antenna 2, 

 3 joints of peduncle uniform in length, flagellum 4-jointed, accessory flagellum 

 1-jointed. Peraeopod 3, 2^ Joint short and broad, the others greatly (moderately 

 in figure) dilated at the extremity, finger almost straight. üropod 3 very 

 small. Telson small. Colour yellowish white. L. 4 mm. 



Perhaps the young of ü. elegans (p. 131). 

 Arctic ücean (Finmark). Depth 1167 m. 

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



