Ceradociis, Maera ' 433 



peduncle very long, 2'^ Joint longer thau 1^*, 3<^ scarcely ^/g aslongas2^, flagellum 

 shorter than peduncle, with 35 short joints, accessory flagellum 5-joiuted. 

 Antenna 2 much shorter, slender, gland-cone long, ultimate Joint of peduncle 

 shorter than penultimate, flagellum subequal to ultimate Joint of peduncle, 

 16-jointed. Gnathopod 1, 5*^ Joint rather smaller thau 6"^'', both hirsute. 

 Gnathopod 2 much larger, 5*^ Joint short, cup-shaped, 6*^ very large, oblong, 

 widening a little to the oblique, well defined palm, which is much shorter 

 than the bind margin, finger serrate within. Peraeopods 1 and 2 small. 

 Peraeopods 3 — 5 rather robust, peraeopod 3 very short, ö^'i long; 2^ Joint 

 not greatly expanded, bind margiu serrate, forming below au acute coruer. 

 Uropods 1 — 3 as in C. orchestiipes. Telson deeply cleft, lobes divergent, 

 with spinules on outer margin and in the emarginate apices. L. over 50 mm. 



Arctic Ocean (Iceland). 



33, Gen. Maera Leach 



1813/14 Maera (Sjj. uu.: M. grossimanä), Leach in: Edinb. Enc, v.7 p. 403, 432 

 1893 M., A. DellaValle in: F. Fl'. Neapel, i;. 20 p. 724 | 1894 3/., G. 0. Sars, Crust. 

 Norway, v.i p. 517 | 1843 Moera, L. Agassiz, Noraencl. zool., Crust. p. 18 | 1ÜÖ3 Leptothoe 

 (Sp. un. : L. danae), Stinipson in: Smithson. Contr., v.Q nr. 5 p. 46 | 1862 Megamoera 

 (part.). Bäte (& Westwood), Brit. sess. Crust., v. 1 p. 400. 



Body more or less slender. Head without conspicuous rostrum. Side- 

 plates shallow, 4**^ scarcely or not emarginate behind. Antenna 1 the longer, 

 2'i Joint usually longer than 1^*, accessory flagellum well developed. Antenna 2. 

 flagellum short. Upper lip Symmetrie. Lower lip with inner lobes. Mandible 

 with slender palp, '6^ Joint straight. Maxilla 1, inner plate with few setae, 

 outer with (probably) lU spines. Maxilla 2, inner plate not fringed with setae 

 on inner margin. Maxillipeds normal, but the 3 spine-teeth ofi apex of 

 inner plate are not certainly present. Gnathopods 1 and 2 subchelate, gnatho- 

 pod 2 usually much the larger in the ö. Peraeopods slender, peraeopods 4 

 and 5 longer thau the rest, 2^ Joint of peraeopods 3—5 variable, sometimes 

 very slender. üropod 3 often reaching much beyond the others, rami equal 

 or not very unequal, 1-jointed. Telson rather small, deeply cleft. 



12 accepted and 8 doubtful species. 



Synopsis of accepted species: 



I Uropod 3 scarcely or not at all extending 

 1 < beyond uropod 1 — 2. 



l Uropod 3 extending much beyond uropod 1 — 5. 



Without eyes 1. M. tenera p. 434 



With eyes — 3. 



Uropod 3, rami not apically obtuse 2. M. quadrimana . . p. 434 



Uropod 3, rami apically obtuse — 4. 



Peraeopods 4 and 5, 2d Joint not produced 



downward 3. M. grossimanä . . p. 435 



Peraeopods 4 and 5, 2d Joint produced downward 4. M. inaequipes . . . p. 435 



Some Segments dorsally dentate — 6. 

 No Segments dorsally dentate — 7. 



Pleon Segment 1 without dorsal teeth .... 5. M. tenuimana . . . p. 436 

 Pleon Segment 1 with dorsal teeth 6. M. westw^oodi . . . p. 436 



Body pubescent 7. M. furcicomis . . . p. 437 



Body not pubescent — 8. 



Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 28 



