406 Niphargus 



„ ( Gnathopods 1 and 2, ßth Joint narrowing distally. . 7. IT. fontanus . p. 408 

 \ Gnathopods 1 and 2, 6th Joint widening distally . . 8. N. koehianus p. 408 



I Antenna 1, accessoi^ flagellum tuberculiform ... 9. N. orcinus . . j). 408 

 \ Antenna 1 , accessory flagellum spine-like 10. N. godeti . . p. 409 



1. N. croatieus (Jurinac) 1887 Eriopis croatica, Jurinac in: Rad Juguslav. 

 Ak., i;. 83 j». 96 t. 1.1 — 12a | 1888 Nipharyus croatieus, Jurinac, Fauna Xroat. Karst., 

 p. 11 — 16 r. i 1890 X. c, Wrzeöniüwski in: Z. wiss. Zool., v. oO j). 610, 670, 676, 716 

 1889 Oammarus c, Mouiez in: Rev. biol. Nord France, o. 1 ]). 252. 



Pleon Segments 1 — 6, bind margiu armed witli a close-set row of 

 backward pointiug spinules. Side-plates successively deepoj- from 1^* to 3*', 

 4*^ less deep thaii 3^. rieuii segmeuts 1 — 3, postero-lateral coruers sub- 

 acute. P]yes waiiting. Auteuua 1 in (5" ratber longer tban tbe body, flagellum 

 more tban 4 times as long as pedunde, 73-jointed, accessory flagellum 

 2-joiuted. Antenna 2 less tban V« as long as antenna 1, ultimate Joint of 

 peduncle longer tban penultimate. more tban twlce as long as tbe 8-jointed 

 flagellum. Gnatbopod 1, 6*^' Joint trapezoidal, a little tending to oval, being 

 outdi'awn towards tbe hinge of tbe finger, palm sligbtly couvex, well detined. 

 In tbe 9 gnatbopod 1 appears to bave tbe ö"^'* Joint almost rectangular. 

 Gnatbopod 2, 6*^' Joint rectangular, palra sligbtly convex. Peraeopod 3 con- 

 siderably longer tban peraeopods 1 and 2, but sborter tlian tbe long equal 

 peraeopods 4 and 5. Peraeopods 3—5, 2*^ Joint comparatively narrow, coarsely 

 seiTate. üropod 1, rami equal to peduncle. Uropod 2 sborter, rami longer 

 tban pedimcle. Uropod 3 reacbing mucb beyond tbe otbers, P* Joint of 

 outer ramus 15 times as long as 2*^, carrying 8 plumose setae and many 

 spinules, inner ramus very sbort, witb apical spine and seta. Telson in ö 

 witb a wide arched emargination ratber more tban '/s ^^ its lengtb, and 

 2 or 3 spines on tbe blunt apices, in 9 -cleft more tban -3 of lengtb, tbe 

 incision not i'ounded but acute, 5 — 8 spines on tbe apices. Colour quite 

 wbite. L. 9 18-5, ö 20 mm. 



Oroatia (cavern near Zagorije). 



2. N. forelii Humb. 1877 N. puteanus var. f. -j- N.p. var. onesiensis, Ä. Humbert 

 n: Bull. Soc. Vaudoise, c.U p.278 t.6, 7 i 1888 N.p. var. f., T. Stebbing in; Rep. Voy. 

 Challenger, 15. 29 p. 456 ; 1890 N. f., Wrzeäniowski in: Z. wiss Zool., n 50 p. 621, 631, 

 688, 674 I 1889 Gammarus puteanus var. f., Moniez in: Rev. biol. Nord France, i'. 1 

 p. 247 j 1882 Niphargus p. var. forellii, G.Joseph in: Berlin, ent. Z., «;. 26 p. 7. 



Side-plates 1 — 4 deeper tban tbe foUowing. Pleon segment 2, postero- 

 lateral corners rotundo-quadrate, segment 3, postero-lateral corners acute. 

 Eyes tvanting. Antenna 1 ratber less tban balf as long as body, 1^* Joint 

 of peduncle nearly as long as 2*^ and 3^^ combined. flagellum 16-jointed. 

 Antenna 2, ultimate Joint of peduncle ratber sboiier tban penultimate, 

 flagellum 7 — Q-jointed. Inner lobes of lower lip not mentioned. Gnatbo- 

 pods 1 and 2 similar, 6*^ Joint moderately broad at base, widening towards 

 tbe straigbt palm at rigbt angles witb tbe convex bind margin ; palm ratber 

 longer in gnatbopod 2 tban in gnatbopod 1. Peraeopods 1 — 3 subequal, 

 sborter tban peraeopods 4 and ö, Peraeopods 3 — 5, 2** Joint ratber broad, 

 according to flgure. üropod 3, outer ramus witb 2*^ Joint well developed. 

 Telson cleft about ^/^ of lengtb. L. 9 mm. 



Switzerland (Lake of Geneva, well at Onex). 



3. N. aquilex Schiödte 1841 Gammarus puteanus (part. : forma II), C. L, Koch, 

 C. M. A., 17.36 ur. 22 | 1889 G. p. (part.: forma U), 3Ioniez in: Rev. biol. Nord France, 

 1. 1 p. 245 11853 Niphargus stygius (err.. nou Gammarus s., Schiödte 1847!), Westwood 



