PLATE XXI. 



Figs. 1-7. Nycti'phanes australis, G. 0. Sars. 



{Continued.) 



Fig. 1. Adult male, from right side ; magnified about eight times. 



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



Fig. 3. Posterior part of trunk, together with a part of first caudal segment, from above, 

 exhibiting the peculiar form of the posterior emargination of the carapace. 



Fig. 4. Left male antenna, with scale and proximal part of llagellum, from below. 



Fig. 5. Leg of penultimate pair in male, with exopod and gill. 



Fig. 6. Inner plate of a male pleopod of first i^air. 



Fig. 7. Inner plate of a male pleopod of second pair. 



Figs. 8-17. Tliysanoessa gregaria, G. 0. Sars. m-;lo 



Fig. 8. Adult female, from left side ; magnified about seven times. 



Fig. 9. Same, from above. 



Fig. 10. Eight eye, from anterior side. 



Fig. 11. Same, from posterior side. 



Fig. 12. Anterior part of body, from above. 



Fig. 13. Right antennular peduncle, from above. 



Fig. 14. Same, from inner side. 



Fig. 15. Left antenna, from below. 



Fig. 16. Preanal spine. 



Fig. 17. Anterior part of carapace of a male specimen, from above, showing the deviating 

 form of the rostral projection. 



