408 * Niphargus 



6. N. viröi Chevreux 1896 N. v., Chevreux in: Bull. Mus. Paris, «;. 2 p. 186. 



Q . . Body less slender thiiii usiial in Niphargus. Pleon segmeut 5 

 with 6 very minute dorsal spines, segmeut 6 with 8. Head, lateral corners 

 very promineut. rouuded. Anterior side-plates much deeper thau their 

 segmeuts, 4*^ uiucli deeper thau 5*''. ]*leou segments 1 — 8, postero-lateral 

 coruers quadrate witli slightly acute poiut. ^]yes wautiug or rudimeutary, 

 perhaps represented by irregulär blotdies of yellowisli pignieut, whicli 

 disappear in spirit. Antonna 1 % ^^ 'ong as body, flagellura 44^ — 56-jointed, 

 accessory flagellum 2-jointed. Autenna 2 very sbort, flagellum a little longer 

 thau ultimate Joint of peduncle, 15-jointed, Gnatliopod 1, 6**' Joint ahnost 

 quadrangular, a little broader thau long, finger matchiug palni. Gnathopod 2, 

 6*^ Joint eonsiderably larger tlian in gnathopod 1, subtriaugular, tending to 

 quadrate, much broader than long, twice as broad as the 5*^ Joint, tinger 

 strongly curved, slightly shorter than palm. Peraeopods 1 — 5 slender and 

 very elongate. Uropod 3, inner ramus rudimeutary, outer very long, 2*^ Joint 

 less than half as long as 1-^^ Telson as broad as long, squarely truncate. 

 with a Wide emargination occupying -j^ of tlie length, each lobe euding in 

 6 strong spines and carrying a group of 3 spines and a setule towards the 

 middle of the outer margin. L. 25 — 31 mm. 



Jura. Gaves. 



7. N. fontanus Bäte 1859 N. /"., Bäte in: P. Dublin Univ. zool. bot. Ass., v. 1 

 p. 237 f. I 1862 N. f., Bäte, C^at. Amphip. Brit. Mus., ]). 175 t. 32 f. 2 1890 N. f., Wizeöniowski 

 in: Z. wiss. Zool., «7.50 p. 665 | 1893 N. suhterraneus (part.), A. DellaValle in: F. Fl. 

 Neapel, v. 20 p. 704. 



Comparatively robust. Side-plate 4 the deepest. Pleon segments 1 — 3, 

 postero-lateral corners acute. J'^yes very small, of irregulär shape, bright 

 lemon. Anteimae 1 and 2 as in N. aquilex (p. 406). Gnathopods 1 and 2 

 alike, 5^^ Joint narrow, 6*^ large, the base mucli wider tlian tlie 5*^, pear- 

 shaped, narrowing from the palni to the hinge of tinger, paliu very oblique, 

 much longer than bind margin, detlned by a strong palmar spine, tinger 

 long, much curved. Peraeopods 1 — 5 as in N. stygius (p. 407). üropod 3. 

 2*1 Joint of outer ramus shorter than 1»'. In the 9 gnathopods 1 and 2 

 have the 6"^ Joint shorter and less distinctly pear-shaped, and uropod 3 

 lias the 2^^ Joint of outer ramus much shorter than 1^^ Telson appareutly 

 as in N. aquilex. L. 12-5 mm. 



South of England. Wells. 



8. N. kochianus Bäte 1859 N. k., Bäte in: P. Dublin Univ. zool. bot. Ass., v. 1 

 |).237 f. I 1862 N.k., Bäte, Cat. Ainphip. Brit. Mus., p. 176 t. 32 f. 3 | 1890 X. k., 

 Wrzeöniowski in: Z. wiss. Zool., v.50 p. 665 | 1893 N . stihterraneus (part.), A. Della 

 Valle in: F. Fl. Neapel, v.2f) p. 704. 



In close agreement with N. fontanus except in regard to gnatliopods 1 

 and 2, 6*'^ Joint, which approaches in form an imperfect oblong Square, abruptly 

 wider than the 5*^ Joint, and wideniug slightly to the sinuous palm, this 

 being nearly at right angles with the sen'ate bind margin. Nothing is 

 said about eyes. üropod 3 figured with a very short 2*^ Joint to outer 

 ramus. L. about 8 mm. 



England (Hampshire and Wiltshire), Ireland (Dublin). Wells. 



9. N. orcinus Joseph 1869 N. 0., Gr. Joseph in: Jahresber. Schles. (ües., u46 p. 52 

 1890 N.O., Wrzeäniowski in: Z, wiss. Zool., r 50 j). 069. ()76 [ 1889 Gammarus 0., Moniez 

 in: Rev. biol. Nord France, v.l p. 252 ] 1893 Niphargus subterraneus (part.)?, A. Della 

 Valle in: F. Fl. Neapel, f. 20 p. 705. 



