2. PLATE IX. 



HYPER1A MEDUSARUM. 



Fig. 1. The male from the side (%). 



» 2. The first pair of antennae, a* ( 2 %). 



» 3. The second » » » a* ( 23 A)- 



» 4. The labrum. tf ( 4 %). 



» 5. The right mandible. <^ ( 4 %). 



» 6. The last joint of the mandibular palp. q* 



( 22 %)- 



» 7. The first pair of maxillae, <? (*%)■ 



» 8. » second » » » ^ ( 4 %)- 



» 9. The maxillipeds. rf (*%). 



» 10. The first pair of peraeopoda. rf ('%). 



» 11. » second » » » o* ( 2 %)« 



» 12. » third » » » tf ("A)- 



» 13. » fifth » » » tf ("/,). 



» 14. Cleft bristle from the first pair of pleopoda. tf 



("%)■ 



» 15. Coupling spine » » » »' » » a* 



( 60 %)- 



The urus. tf («/,). 



The right mandible of the female ( 40 /,). 



The dactylus of the third pair of peraeopoda. $ 



( l2 %)- 



» 16. 



»> 17. 



» 18. 



» 19. 



» 20. J) 



» 21. 



The » » » seventh » » » 9 



A young a day after having been hatched 



( ,0 °/l)- 



The first pair of peraeopoda of the same ( 30 %). 



Fig 



.22 



» 



23 



» 



24 



» 



25 



» 



2(3 



» 



27 



» 



28 



» 



29 



» 



30 



» 



31 



» 



32 



» 



33 



» 



34 



» 



35 



» 



36 



» 



37 



» 



38 



» 



39 



» 



40 



» 



41. 



)> 



42. 



i) 



43. 



HYPERIA HYSTRIX, <?. 



The animal from the side (%). 



The first pair of antennae ( 2 %)- 



» second » » » ( 20 /i)- 



The first pair of peraeopoda ( 2 %). 



» second » » » ( 2 %)- 



» third » » » ( 2 %). 



» fifth » » » (2%). 



» seventh » » » ( 2 %)- 



The urus ( 20 /,). 



HYPERIA LATREILLEI, a*. 



The first pair of antennae (%). 

 The last joints of the flagellum of the same 

 pair ( 10 %). 



The first pair of antennae of a young ( 20 /,). 

 The last joints of the flagellum of the same 

 pair (180/,). 



The second pair of antennae (%). 

 The last joints of the flagellum of the same 

 pair (»o%). 

 The labrum ( 2 %). 

 The right mandible ( 2 %). 

 A piece of the molar tubercle ( 32 %). 

 The same more enlarged ( 64 %)- 

 The first pair of maxillae ( 2 %). 

 » second » » » (*%)• 

 A glandular hair from the same pair ( 12 %). 



x ) Through a change of drawings at the engraving of the plate that of an older young vas engraved instead of 

 the stage described in the text p. 158, the drawing of which will be given in the morphological part. 



