Ericthonius 673 



p. 457 f. ; p. 461 f. | 1862 D. p., C. p. -\- C. d. + C. leachii, Bäte, Cat. Amphip. Brit. Mus., 

 p. 260 t. 44 f. 6; p. 265 t. 45 f. 5; ■p.2i)8 \ 1868 C. macrodadylusvar.pontica, Czerniavski 

 in: Syezda Russ. Est., Syezda 1 Zool. p. 97 | 1871 C. longimanus, A. Boeck in: 

 Forh. Selsk. Christian., 1870 p. 252. 



Possiblj not distinct from E. brasiliensis (p. 671). Body more slender 

 than in E. brasiliensis, especially in d (Sars). Head, lateral lobes with the 

 apical point sometimes well marked (not noted by Sars). Side-plates in ö 

 differing from those in g , the 2^ standing notably apart, and considerably 

 larger than the others. Eyes rather small, rounded, dark red to black. Antennae 1 

 and 2 elongate, 2^ and S'^ joints in antenna 1 subequal. The chief distinction from 

 E. brasiliensis rests with gnathopod 2 in d , which is of great length, the neck or 

 proximal part of Joint 2 elongated, 5*^^ Joint thrice as long as broad, slightly con- 

 stricted at the middle, the tooth or thumb elongate, nearly sti-aight, separated 

 from the 6*^ Joint by a narrow palmar cavity, the tooth sometimes having a 

 subapical inner tooth; 6*^ Joint rather narrow, bind margin sinuous in the 

 middle, with a projection at base; finger with setae on both margins and a 

 group of veiy long ones near the tip. Colour gTeyish, mottled with brown 

 spots. L. 4 — 12'5 mm. 



Tubes attached. 



North-Atlantic with adjoining seas (Europe from Trondjhemsfjord to the Black 

 Sea; Azores; United States of America, depth — 200 m). 



5. E. hunteri (Bäte) ? 1853 Cerapus rubricornis, Stirapson in: Smithson. Contr., 

 V. 6 nr. 5 p. 46 t. 3 f. 33 | ? 1867 C. f., C. riibiformis, Packard in : Mem. Boston Soc, v. 1 

 p. 297 ! 1862 ü. hunteri, Bäte, Cat. Amphip. Brit. Mus., p. 264 t. 45 f . 3 ] 1876 C. h., 

 A. Boeck, Skand. Arkt. Amphip., v. 2 p. 618 t. 28 f. 5 | 1894 Ericthonius h., T. Stebbing 

 in: Bijdr. Dierk., v. 17 p. 45 | 1894 Erichthonius h., G. 0. Sars, Crust. Norway, v. 1 

 p. 605 t. 216 f. 2 I 1880 Ericthonius difformis (part.), S. I. Smith in: Tr. Connect. 

 Ac, V. 4 p. 279 I 1893 Erichthonius d. (part.), A.Della Yallein: F. Fl. Neapel, u 20 p. 382. 



Closely related to E. difformis, but differing as foUows. Body 

 in (S much broader than high (Stimpson). Side-plate 5 larger than side- 

 plate 2, with front lobe very large. Eyes rather large. Antennae 1 and 2 

 perhaps more setose, and very hah-y (Stimpson); each with flagellum of 

 12 joints; 3^ Joint of antenna 1 usually shorter than 2*^. Gnathopod 1, 6*^ 

 Joint rather shorter than S^h, variably expanded. Gnathopod 2 in d more 

 robust; 5*^ Joint not constricted, stout; the tooth not elongate (not always 

 so Short as represented by Sars); 6*^ Joint broad, approximate to tooth of 

 5**", its bind margin lamellar, divided in the middle by a small incision, the 

 two lobes thus fomied, however, being rather variable in their relative pro- 

 portions, finger not very large or rather large, without any notable setae. 

 Peraeopods 1 and 2, 2^ Joint expanded, but less broad in proportion to 

 length than in E. brasiliensis (p. 671). Peraeopods 1 — 3, 2*^ Joint oblong, 

 successively narrower. Peraeopods 4 and 5, finger with denticle on bind 

 margin scarcely perceptible. üropod 3 with a rather longer and more 

 slender ramus. L. 5 — 15 mm. 



Arctic Ocean, North-Atlantic and North-Sea (Norway; North-East-England; 

 North- America; lat. 73» N., long. 34» E.); Kattegat. 



6. E. megalops (0. Sars) 1879 Cerapus in., G. O. Sars in: Arch. Naturv. 

 Kristian., v. 4 p. 461 [ 1885 Erichthonius m., G. 0. Sars in : Norske Nordhavs-Exp., v. 6 

 Crust. I p.210 1. 17 f.4 a— b | 1893 E. difformis (part.), A. Della Yalle in: F. Fl. Neapel, 

 V. 20 p. 383. 



Das Tierreich. 21. Lief.: T. ß. R. Stebbing, Amphipoda I. 43 



