Mc 



ilodc 



259 





10 



11 



12 

 13 



14 



15 



16 

 17 



Synopsis of accepted species: 



Eyes separated by carina of head 



Eycs contiguous — 2. 



Head narrowly produced behind the eyes — 3. 

 Head not narrowly produced behind the eyes — 5. 



Antenna 1, 2d Joint of peduncle much longer 

 than Ist 



Antenna 1, 2d Joint of peduncle not longer 

 than Ist _ 4. 



Produced part of head long 



Produced part of head short 



Rostrum short — 6. 

 Rostrum long — 14. 



Telson transversely truncate — 7. 

 Telson a little emftrginate — 9. 



Antenna 1 in $ , 2d joint longcr than Ist . . 

 Antenna 1 in $ , Ist and 2fl joints subequal — 8. 



Gnathopod 2, process of 5tli joint overreaching 

 hind margin of 6tli; pleon carinate . . . 



Gnathopod 2, process of ötli joint not over- 

 reaching hind margin of 6th; pleon smooth 



Frontal process abruptly deflexed — 10. 

 Frontal process not abruptly deflexed — 11. 



Eyes not very large or prominent; side-plate 1 

 rauch expanded 



Eyes large, prominent; side-plate 1 little 

 expanded 



Peraeopods 1 and 2, 7th joint short — 12. 

 Peraeopods 1 and 2. 7tli joint rather long — 13. 



Peraeopod 5, 2fl joint evenly expanded . . . 

 Peraeopod 5, 2*1 joint piriform 



Colouring tessellated; telson apically insinuate 



Colouring not tessellated; telson with apex 



decidedly emarginate •. 



Antenna 1, 2d joint apically tuberculate . . . 

 Antenna 1, 2d joint not apically tuberculate — 15. 



Eyes large — 16. 

 Eyes not large — 17. 



Side-plate 1 little expanded; gnathopod 1, 

 process of Sth joint broad 



Side-plate 1 much expanded; gnathopod 1. 

 process of 5th joint narrow 



Gnathopods 1 and 2 rather weak; telson broadly 

 rounded at apex 



Gnathopods 1 and 2 rather strong; telson nar- 

 rowed at apex 



1 . M. gibbosus 



2. M. hanseni 



3. M. longirostris 



4. M. kröyeri . . 



p. 259 



p.260 



p. 260 

 p. 261 



5. M. pallidus . . . . p. 261 



6. M. earinatus . 



7. M. griseus . . 



8. M. borealis 



9. M. Schneider! 



10. M. crassirostris 



11. M. latimanus . 



12. M. tesselatus . 



13. M. Simplex . . 



14. M. tubereulatus 



15. M._norvegicu8 



16. M. subnudus 



17. M. paekardi . . . 



18. M. tenuirostratus 



p. 261 

 p. 262 



p. 262 

 p. 263 



p.263 

 p. 264 



p. 264 



p. 264 

 p. 265 



p. 265 

 p. 266 



p. 266 

 p. 267 



1. M. gibbosus Chevreux 1888 M. g., Chevreux in: Bull. Soc. zool. France, 

 ».13 p.41 I 1893 Oediceros affinis (part.)?, A. DellaValle in: F. Fl. Neapel, i).20 p.556 



Head with rostrum and pleon carinate. Rostrum large, evenly curved 

 witb high narrow carina, shortly acuminate, reaching apex of 1*' joint of . 



17* 



