PLATE XVII. 



Thysanopoda tricuspidata, Milne-Edwards. 



Fig. 1. Adult female, from left side ; magnified about six times. 



Fig. 2. Anterior part of body, from above. 



Fig. 3. Extremity of tail, with caudal fan, from above. 



Fig. 3o. Tip of terminal projection of telson ; highly magnified. 



Fig. 4. Preanal spine. 



Fig. 5. Left antennular peduncle of a younger specimen, from above. 



Fisf. 6. Rioflit antenna, from below. 



Fig. 7. Anterior lip. 



Fig. 8. Posterior lip. 



Fig. 9. Mandible, with palp. 



Fig. 10. Maxilla of first pair. 



Fig. 11. Maxilla of second pair. 



Fig. 12. Maxilliped. 



Fig. 12a. Terminal joint of same ; more highly magnified. 



Fig. 13. Leg of first pair, with attached gill and luminous organ. 



Fig. 13a. Terminal joint of same ; more highly magnified. 



Fig. 14. Leg of second pair, with attached gUl. 



Fig. 15. Leg of fifth pair, with attached giU. 



Fig. 16. Leg of penultimate pair, with gill and luminous organ. 



Fig. 1 7. Gill of posterior pair. 



Fig. 1 la. Eudiment of leg of last pair. 



Fig. 19. Epipodite of maxilliped. 



Fig. 20. Gill of first pair. 



Fig. 21. GiU of second pair. 



Fig. 22. Gill of third pair. 



Fig. 23. Gill of fourth pair. 



Fig. 24. Gil] of fifth pair. 



Fig. 25. Gill of sixth, or penultimate pair. 



