PLATE IV. 



PAGE 



Leueon assimilis, n. sp., . . . . 34 



Kg. 1. Young male, viewed from the right side ; magnified about eighteen 

 diameters. 



Fie. 2. Same, seen from above. 



Fio-. 3. Anterior part of carapace, seen from the left side ; more highly magnified. 



Fio-. 4. Antennal segment, together with antennulse and left antenna, seen from 



below. 



Fig. 5. Outer part of an antennula ; more highly magnified. 



Fig. 6. An^auditory bristle from same antennula ; very highly magnified. 



Fig. 7. Anterior lip. 



Fig. 8. Mandibles, seen from behind. 



Fig. 9. Posterior lip. 



Fig. 10. Maxilla of first pair. 



Fig. 11. Maxilla of second pair. 



Fig. 12. Right maxilliped, seen from above. 



Fig. 13. Outer part of same ; more highly magnified. 



Fig. 14. Part of inner edge of carpal joint of same maxilliped, with five of the 



marginal spines. 



Fig. 15. Left maxilliped, together with the corresponding part of the branchial 



apparatus, seen from above. 



Fig. 16. Gnathopod of first pair. 



Fig. 17. Gnathopod of second pair. 



Fig. 1 8. Leg of first pair. 



Fig. 19. Leg of second pair. 



Fig. 20. Leg of third pair. 



Fig. 21. Leg of fourth pair. 



Fig. 22. Leg of fifth pair. 



Fig. 23. A pleopod. 



Fig. 24. Outer part of same ; more highly magnified. 



Fig. 25. Last caudal segment, together with the uropoda, seen from above. 



