PLATE XVIII. 



Figs. 1-14. Thysanopoda obtusifro7is,^ G. 0. Sars. 

 Fig. 1. 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. 

 Fif. 4. Left antennular peduncle, from inner side. 



Fiff. 5. Left antenna, with scale and proximal part of flagellum, from below. 

 Fig. 6. Mandibular palp. 

 Fig. 7. Maxilla of first pair. 

 Fig. 8. Maxilla of second pair. 

 Fio'. 9. Terminal joint of a leg of first pair. 

 Fig. 10. One of the anterior gills. 

 Fio-. 11. Leg of penultimate pair, with attached gill. 

 Fig. 12. Gill of posterior pair, with rudiment of leg. 

 Fig. 13. Inner plate of a male pleopod of fii-st pair. 

 Fio-. 14. Inner plate of a male pleopod of second pair. 



Figs. 15-20. Thysanopoda cnstata, G. 0. Sars. 

 Fio-. 15. Adult male, from right side; magnified about three times. 

 Fig. 16. Anterior part of body, from above. 

 Fig. 17. Extremity of tail, with caudal fan, from above. 

 Fig. 18. Tip of telson ; more highly magnified. 

 Fio-. 1 9. Inner plate of a male pleopod of first pair. 

 Fig. 20. Inner plate of a male pleopod of second pair. 



1 Thysanopoda obtusirostris has been put in the plate by mistake. 



