122 Melita 



iPleoii Segment 4 produced to a single dorsal 

 tooth 7. M. palmata . . . . p. 425 

 Pleon segnient 4 produced to more than 1 

 dorsal tooth — 8. 

 j Gnathopod 2 in cJ, finger ending obtusely . . 8. M. obtusata . . . . p. 426 

 ) Gnathopod 2 in cJ, finger ending acutely — 9. 



j Pleon segment 3 not dorsally dentate .... i). M. amoena . . . . p. 426 

 I Pleon segment 3 dorsally dentate - 10. 

 , Pleon Segments 2 and 3 each with a siiigle 



dorsal tooth 10. M. forniosa .... p. 427 



Pleon Segments 2 and 3 each with several 



dorsal teeth — 11. 

 Teeth on pleon segments 1 — 6 ranging from 



3 to 11, side-plates 1 — 4 shallow .... 11. M. dentata .... p. 427 

 Teeth on pleon segments 1 — 6 usually limited 



to 3, side-plates 1 — 4 rather deep .... 12. M. gladiosa .... p. 428 



10 



11 



1. M. pallida O. Sars 1879 M.p., G. ü. Sars in: Arch. Natura. Kristian., «J. 4 

 p. 457 I 1885 M.p., G. O. Sars in: Norske Nordhavs-Exp.. v.6 Crust. i p. 179 t. 15 f. 1, 

 la— 1 I 1893 M.2)., A. Della Valle in: F. Fl. Neapel, «7.20 p. 716. 



Back rounded, but body greatly compressed, pleon segments 1 — 5 

 eacli produced into a pair of dorsal adpressed teeth, betweeu which 

 there are 2 — 4 sraaller denticles. Side-plates 1—4, lower raargin quite 

 smooth. Pleon segments 2 and 3, postero-lateral corners acutely produced, 

 in segment 3 upward curviug. p]yes entirely wanting. Äntenna 1 nearly 

 as long as body, 2*^ Joint not longer than 1^^ flagellum longer than peduncle, 

 filiform, 24-jointed, accessory flagellum 3-jointed. Antenna 2 about half as long 

 as antenna 1, ultimate and penultimate joints of peduncle equal, flagellum 

 11-jointed. Mandibular palp short and slender, 3*^ Joint acute, ending in 

 2 simple setae. Maxiila 1, inner plate with numerous setae, outer with 

 strong spines, 9.'^ Joint of palp slender, curved, with a few delicate spines 

 at apex. Maxillipeds, 3"^ Joint of palp distally dilated, setose, finger short, 

 conical. Gnathopod 1, 6*^ Joint as long as 5^^ abruptly truncate at palm. 

 Gnathopod 2, 6**^ Joint large, oval, palra rather oblique, defined by a projecting 

 corner, armed with a short spine. Peraeopods 3—5, 2*^ Joint indistinctly serrate 

 behind. Uropod 3 the longest, outer ramus more than twice as long as peduncle, 

 arraed with few spines, rudimeutary inner ramus bare. Telson much shorter 

 than peduncle of uropod 3, cleft to base, lobes scarcely dehiscent, narrowly 

 truncate apices each with a setule. Colour uniform white. L. reaching 26 mm. 



Arctic Ocean (west of Spitzbergen). Jn cavities (work of Teredo ?) in w ood 

 dredged from 2510 m. 



2. M. quadrispinosa Vüsseler 1889 3f. <;r., Vosseier in: Arch. Natnrg., «;. 55i 

 p. 157 t. 8 f. 15—24 I 1893 M. palmata^?, A. Della Valle in : F. Fl. Neapel, v. 20 p. 716. 



Very like M. dentata (p. 427). Pleon segment 4 produced to 1 strong 

 dorsal tooth, segment 5 to 3 weaker teeth. Pleon segments 2 and 3. postero- 

 lateral corners acutely produced. and in segment 3 upturned. Body slender, 

 strongly compressed. Eyes small, scarcely pigmented. Antenna 1, accessory 

 flagellum 3-jointed. Antenna 2, flagellum scarcely longer than penultimate 

 Joint of peduncle. Mandibular palp thin, with few setae. Maxiila 1 with few 

 setae (very numerous in M. dentata) on inner plate. Gnathopod 1, 5*^'' Joint 

 mucH longer (in figure) than the oval 6^^, which has a palm, though weakly 

 defined, b^^ and 6'^ joints both setose on bind margin. Gnathopod 2, 5*^ Joint 

 not Short, 6^^ longer and broader, oval, palm weakly defined, finger curved, 



