128 Pontoporeia, Urothoe 



2. P. femorata Krayer 1842 F.f., Kreyer in: Naturh. Tidsskr., r. 4 p. 153 [ 

 1846 1\ f., Kreyer in : Voy. Nord, Crust. t. 23 f. 2a— y | 1891 P. f., G. O. Sars, Crust. 

 yorway, v.l p. 123 t. 41 f . 1 | 1893 F.f., A. DellaYalle in: F. Fl. Neapel, t\20 p.717 

 t. 60 f. 7 I 1859 P. furcigera, R. 31. Bruzelius in: Svenska Ak. Handl., n. ser. f. 3 nr. 1 

 p. 49 t. 2 f. 8 I 1884 F. f., H. Blanc in: N. Acta Ac. Leop., v. 47 p. 60 t. 7 f. 40—44. 



Back broad. Head, lateral corners angular. Side-plates 1 — 3 witb 

 tooth at lower bind corner, 1^* broadly expanded, 6^^ witb front lobe deep. 

 Pleon Segment 3. postero-lateral angies narrowly rounded; segment 4 witli 

 bifurcate process ou tbe back. Eyes reniform, brigbt red. Antenna 1 in 

 o , flagellum sborter tban peduncle, 9-jointed, accessory flagellum 2-jointed. 

 Antenna 2 in Q, nltimate and penultimate joints of peduncle subequal, togetber 

 equal to 1 2-jointed flagellum. Gnathopod 1, 5*'^ Joint very broad, 6*^' obliquely 

 and broadly oval, finger very slender and curved. Gnathopod 2, 6*^ Joint 

 a little sborter tban 5*'^. Peraeopod 5 (Fig. 36), 2*^ Joint very broad, niuch 

 longer tban rest of limb. üropod 3, outer ramus considerably larger tban 

 inner, densely spinöse on outer edge. Telson rather longer tban broad, 

 cleft beyond centre, 3 setules on eacb rounded apex. Colour paleyellowisb. 

 L. y 14 — 17 mm. 



Arctic Ocean; Xorth-Atlantic (Labrador, Norway); Kattegat; Baltic. Depth 

 38—188 m. 



3. P. affinis Lindstr. 1855 F. a., Lindström in: Öfv. Ak. Förh., u 12 p. 63 | 

 1867 P. a., (t. 0. Sars, Crust. d'Eau douce Norvege, p. 82 t. 7 f. 10—25; t. 8 f. 1—5 | 

 1891 F. a., G. 0. Sars, Crust. Norway, v.l p.l24 t.41 f. 2 | 1893 F. a. (part.), A. Della 

 Valle in: F. Fl. Neapel, ?;.20 p.717 t.54 f . 1 ( 1885 F. femorata (err., non JKreyer 1842!), 

 H. Blanc in: N. Acta Ac. Leop., ».47 p. 58 t. 6 f. 33; t. 7 f. 34—39. 



Back less broad tban in P. femorata. Pleon dorsally birsute, segment 4 

 witbout process. Head, lateral corners narrowly rounded. Side-plates 1 — 3 witbout 

 tootb, 1^* little expanded, 5*^ witb front lobe not very deep. Pleon segment 3, 

 corners subquadrate. Eyes small, oval, black. Antenna 1 in 9 , flagellum as 

 long as peduncle, accessory flagellum 3-jointed. Antenna 1 in d {F. ßicomis 

 Smitb), flagellum 3o-jointed; antenna 2 in d, flagellum 50-jointed. Gnatbopod 1, 

 5*"^ Joint of moderate breadtb, 6*^^ narrow oval. Gnatbopod 2, 6*^ Joint 

 about as long as 5*^. Peraeopod 5, 2^ Joint scarcely longer tban rest of 

 limb. üropod 3 in 9 very small. Telson small, broader tban long, cleft 

 about to centre (Sars) or nearly to base (Blanc). Colour yellowisb, orauge- 

 tinged, bluisb-green borders. L. 9 8 mm. 



Fresh water lakes (Norway, Swoden, Russia, Nortli-Ainerica); Baltic, Kattegat, 

 Kara Sea, North-Atlantic (France). 



P. hoyi S. T. Sm. 1871 F. affinis (err.?, non Lindström 1855!), S. 1. Smith (& 

 A. E. Yerrill) in: Amer. J. Sei., ser. 3 u2 p. 452 \ 1893 F. a. (part.), A. Della Valle in: 

 F. Fl. Neapel, t;. 20 p.717 | 1874 P. hoyi -\- Fontiporeia filicornis, S.I.Smith in: Rep. 

 U. S. Fish. Comm., v. 2 p. 647 t. 2 f. 5; p. 649. 



Neither the „papilliform appendages" (mentioned also by Sars 1867 in P. affinis) 

 on the sternal portion of the thoracic Segments in P. hoyi, nor tlie long flagella with 

 calceoli in F. filicornis cj are of specific value. 



North-America (Lake Superior, Lake Michigan). 



7. Gen. Urothoe Dana 



1852 Urothoe, J. D. Dana in: Amer. J. Sei., ser. 2 r. 14 p. 311 | 1853 U. (part.), J. 1). 

 Dana in: U. S. expl. Exp., v.l'dn p. 920 | 1857 Urothoe, Bäte in: Ann. nat. Hist., ser. 2 r. 19 

 p. 145 1 1891 Urothoe, T. Stebbing in : Tr. zool. Soc. London, v. 13 1 p. 1 1 1891 Urothoe, G. 0. 

 ^ars, Crust. Norway, v.l p.l37 | 1893 Urothoe, A. Della Valle in: F. Fl. Neapel, t;.20 p.663 \ 

 1853 Egidia (Sp. nn. : E. pulchella), A.Costa in: Rend. Soc. Borbon., n. ser. v.2 p. 170. 



