686 Corophium 



8 



9 



10 



Antenna 2, ultimato Joint of peduncle apically 



produced 7. C. robustum . . p. 689 



Antenna 2, ultimate Joint of peduncle not apically 



produced — 9. 



Peraeopod 5, joints 4—6 broad 8. C. mucronatum . p. 689 



Peraeopod 5, joints 4 — 6 narrow — 10. 

 Antenna 2, penultimate Joint of peduncle with 



inner tooth to apical process 9. C. cvirvispinum . p. 690 



1 Antenna 2, penultimate Joint of peduncle without 



11 



inner tooth to apical process 10. C. monodon . . . p. 690 



Antenna 2 in $ . penultimate Joint of peduncle 



thick 11. C. crassicorne . p. 690 



Antenna 2 in $ , penultimate Joint of peduncle 

 l not thick 12. C. bonellü . . . p. 691 



1. C. volutator (Fall.) 1710 „Piilex marinus cornutiis", Jo. Ray, Hist. Ins., 

 p. 43 I ?1761 Oniscus bicaudatus, Linne, Fauna Svec, ed. 2 p. 500 j ?1793 Cymothoa 

 bicavdata, J. C. Fabricius, Ent. syst., v.2 p. 507 j 1893 Corophium bicaudatum, A. Della 

 Valle in: F. Fl. Neapel, «;. 20 p. 372 t. 56 f. 2-6 | 1766 Oniscus volutator, Pallas, Mise, 

 zool., p. 192 t. 14 f. 20 I 1888 Corophium v., T. Stebbing in: Rep.Voy. Challenger, ?).29 

 p.21,29, 34| 1893 C. v., Chevreux & E. L. Bouvier in: Ann. Sei. nat., ser. 7 ».15 p. 140 [ 

 1767 Cancer grossipes, Linne, Syst. Nat., ed. 12 v. 2 p. 1055 | 1777 Gammarus g., J. 0. 

 Fabricius, Gen. Ins., p. 248 | 1836 Corophium g., R. Templeton in: Mag. nat. Hist., V.9 

 p. 12 I 1876 C. g., A. Roeck, Skand. Arkt. Amphip.,' u 2 p. 623 t. 28 f. 6 \ 1894 C. g., 

 Gr. 0. Sars, Crust. Norway, v. 1 p. 614 t. 219 | 18Ü6 C. g., Sowinski in: Mem. Soc. Kiew, 

 t;.15 p.373 (distribution) | 1177 Astacus linearis, Pennant, Rrit.Zool., ed.4 «;.4 p. 17 1. 16 

 f. 81 j 1779 Gammarus longicornis, J. C. Fabricius. Reise Norweg., p. 258 | 1793 G. l., 

 J. C. Fabricius, Ent. syst., v.2 p.515 | 1806 Corophirimlongicorne, Latreille, Gen. Crust. 

 Ins., v.\ p. 59 I ?1874 C. bonelli, Ritzema Bos, Bijdr. Crust. Hedriophthal., p. 54. 



Body moderatety slender, pleon segments 4 — 6 distiiict. Head, rostrum 

 small; lateral lobes narrowly rounded, not veiy prominent. Side-plate 1 with 

 about 5 setae on produced apex. Eyes very small, dark. Antenna 1 in d 

 nearly half, in § little more than ^/.^ as long as body; 1^* Joint longer than 

 2*^ and 3*^ combined, in d serrulate below, in 9 with 2 stout spines; flagellum 

 nearly as long as peduncle, 12— 14-jointed. Antenna 2 in (5 as long as 

 body; penultimate Joint of peduncle stout and long, lower margin produced 

 to a Short tooth bounding an apical sinus; ultimate Joint much narrower, nearly 



as long, without any tooth, much longer than 

 the 3-jointed flagellum. Antenna 2 in Q 

 about half as long as body, except for 

 shortening of ultimate and penultimate joints 



Uropod 1 "f'ljy^ ^ of peduncle, constructed as in ö. Gnatho- 



Uropod 8 pod ^' ^*^ joi^* rather longer than 6*^^; 



6*^ widening a little distally; palm nearly 



transverse and matching finger. Gnathopod 2, 



Vr%\'L-sltt:iZ: 5*' Jöi^t rather shorter than 6«- finger rather 



[After G. 0. Sars.] loug, perfcctly smooth. Peracopods 1 and 2, 



. . finger scarcely longer than 6*^ Joint. Peraeo- 



pods 3 and 4, 4**» jointsetose on both margins. Peraeopod 5, 2*^ Joint oval, 



well expanded. üropod 3, peduncle broadcr than the rounded oval, setose, 



ramus (Fig. 115), Telson almost an equilateral triangie, with obtusely 



pointed apex. Colour whitish, marbled with brown on back and antenna 2. 



L. 6 mm. 



North-Atlantic with adjoining seas (Europe from West-Norway to the Adriatic). 

 Forming tubulär galleries in the mud of tidal swamps. 



