382 Weyprechtia, Paramicruropus. 



times producing a slightly trilobed appearance. L. reaching 51 mm (antenna 2: 

 24 mm). 



Arctic Ocean (Spitzbergen; Murman Sea, lat. 69^ N., long. öO** E., depth 28 m; 

 glacial sea of Siberia between Cape Vankarema and Behring Strait, depth 7 — 11 m). 



2. W. pinguis (Kröyer) 1838 Gammarus pingvis, Kröyer in: Danske Selsk. 

 Afh., v.l p. 252 1. 1 f. 5 I 18ö2 Amathia pinguis, Bäte, Cat. Amphip. Brit. Mus., p. 200 | 

 1871 Amathilla pingvis, A. Boeck in: Forh. Selsk. Christian., 1870 p. 218 | 1874 Ä. 

 pinguis, Buchholz in: Zweite D. Nordpolarf., v.2 p. 853 t. 9 f . 2 | 1878 A. p., Miers in: 

 Nares, Voy. Polar Sea, v.2 p. 246 | 1893 A. p., A. DellaValle in: F. Fl. Neapel, r. 20 

 p. 684 t. 59 f. 89 | 1895 A. p., Ohlin in: Acta Univ. Lund., v.'dl nr. 6 p. 50 | 1894 

 Weyprechtia p., T. Stebbing in: Bijdr. Dierk., v.ll p. 41. 



Closely resembling W. heuglini. Side-plate 4 with Single normal 

 emargination. Upper lip very large, not divided at the end (broadly conical, 

 Buchholz ; but ?). Mandible, cutting plate with few teeth on the point (Boeck), 

 or completely without teeth (Buchholz). Gnathopods 1 and 2 with very 

 oblique, straight, fairly well defined palm, longer than in W. heuglini. 

 Peraeopod 4 intermediate in length between peraeopods 3 and 5 (Kröyer: 

 a little smaller than 3* or 5**^). L. 24 — 29 mm (antenna 2 half this length). 



Arctic Ocean (Greenland, depth 6 — 56 m; Spitzbergen, depth 4 — 22 m; circum- 

 polar, reaching lat. 82» 24' N.). 



9. Gen. Paramicruropus Stebb. 



1899 Paramicruropus, T. Stebbing in: Tr. Linii. Soc. London, ser. 2 v.7 p. 423. 



One of the pleon segments abruptly elevated above the next; pleon 

 Segment 6 very small. Antennae 1 and 2 short; antenna 1 the longer, 

 accessory flagellum small. Gnathopod 1, 6*^ Joint not smaller than that of 

 gnathopod 2.^ Peraeopods 1 — 5 not elongate. üropods 1 and 2 not very 

 long, üropod 3 .rudimentary, rami not very unequal. Tclson small, entire. 



2 species. 



Synopsis of species: 

 Pleon Segment 3 overarching the small 4tli segment . . 1. P. solskii . . . . p. 382 

 Pleon segment 4 large, overarching the small 5th segment 2. P. taezanoAvskii . p. 382 



1. P. solskii (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soc. ent. Ross., 

 iJ. 10 suppl. p.42, 153 t.3 f. 2 11893 AmathiUa? s., A. Della Valle in : F. Fl. Neapel, ?7.20 

 p.930 1 1899 Paramicruropus s., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.l p.423. 



Description incomplete. All segments (in figure) strongly ridged trans- 

 versely, perhaps with exception of the very small pleon segments 4 — 6. 

 Head not rostrate. Pleon segment 3 unusually large, overarching the small 

 segment 4, grooved by a deep, horizontal, arched furrow. Eyes small, reni- 

 form, black. Antenna 1 a little the longer, 74 as long as the body, peduncle 

 shorter than in antenna 2, flagellum 17-jointed, accessoiy flagellum 3-jointed. 

 Antenna 2, flagellum 12-jointed. Gnathopods 1 and 2 have short 5*^ Joint, 

 6*^ almoud-shaped. Peraeopod 1 longer than peraeopod 2 ; peraeopods 3 — 5 with 

 2"^ Joint narrowly oval, longitudinally carinate. üropods 1 and 2 feebly developed, 

 reaching back almost as far as uropod 3. üropod 3, rami small, equal. Telson 

 apically rounded (cf. Dybowsky 's analytical key). Colour clouded yellow. L. 23 mm. 



Lake Baikal. 



2. P. taezanowskii (Dyb.) 1874 Gammarus t., B. Dybowsky in: Horae Soc. 

 ent. Ross., u 10 suppl. p. 156 t. 14 f. 9 | 1893 Acanthonotosoma? t, A. Della Valle in: 

 F. Fl. Neapel, v. 20 p. 930 | 1899 Paramicruropus t, T. Stebbing in: Tr. Linn. Soc. 

 London, ser. 2 v.l p. 423. 



