1909.] 



FROM THE BAY OF BISCAY. 879 



Fig. 11. Second gnatliopod, young $ . S. grandimanus. X 44. 



12. Second gnathopod, large $ . „ X 44. 



13. Second gnathopod, young $ , Irish specimen. S. gra-ndimanus. X 28. 



14. Finger of first gnathopod, under surface, young ^ . „ x 176. 



15. Finger of first perasopod, young $. S. qrandimaniis. X 49. 



16. „ „ „ ? . ■ „ X 84. 



17. Finger of third peraeopod, young 9 • „ X 84. 



18. Accessory flagellum, superior antenna, young ^ . S. grandimanus. X 109. 



19. Side-plate 4, young <J. S. grandimanus. X 28. 



20. Upper lip, large $ . „ X 38. 



21. Lower lip, „ „ X 50. 



22. „ young ? . „ X 50. 



23. „ young <?, taken from above to show relative proportions. 



S. grandimanus. X 38. 



24. Left mandible, large $ . S. grandimanus, X 50. 



25. Cutting-plate and accessory plate, right mandible, young 

 26. 

 27. 



28. Right maxilliped, large ? • S. grandimanus. 



29. First maxilla, j'oung $ . „ 



30. Second mavilla, j'oung ^ . „ 



31. Second and third uropods and telson, young $ . 



32. Apices of telson, young (J. S. grandimanus. 



Plate LXXXI. 

 All the figures, except fig. 51, from the ' Huxley ' specimens. 



Fig. 33. Whole animal, $ . Eusirus biscayensis Bonnier; actual size 13"o mm. 



34. Antenna;, $ . „ „ » X 11. 



35. Accessory fiagellum, superior antenna, $ . E. biscayensis. X 28. 



36. Antenu*, $. E. biscayensis. X 11. 



37. Dorsaloutlineof 3rd, 4th, and 5th pleon segments, ^. E. biscayensis. Xll. 



38. Upper lip, $ . E. biscayensis. X 28. 



39. Lower lip, ? . „ X 28. 



40. Maxilliped, inner surface, ?. E. biscayensis. X 28. 



41. Cutting-plate and accessory plate, right mandible, $ . E. biscayensis. X 96. 



42. Accessor}' plate, right mandible, $ . From another specimen. „ 



43. Tooth from molar, right mandible, ^ . „ 



44. Cutting-plate and accessory plate, left mandible, ^ . „ 



45. Uropodsand telson, $ . One side flattened to show the uropods. „ 



46. Upper lip, (? . Rkachotropis rostrata Bonnier. X 26. 



47. Cutting-plate and accessory plate, left mandible, $ . R. rostrata. 



48. „ „ „ „ right mandible, $ . „ 



49. Whole animal, full-grown ^ . Rhachotrojiis helleri Boeck ; actual size 



12"5 mm. 



50. Cuticle from side-plate of first gnathopod, $ . M. helleri. X 176. 



51. Portion of egg-mass, from young $ , 10 mm. in length ; taken from under- 



neath, to show method of attachment, Irish specimen. B. helleri. X 33. 



52. Accessory flagellum, superior antenna, $ , with calceolus. „ x 125. 



53. „ „ young specimen from incubatorj' pouch. „ XoO. 



54. Cutting-plate and accessory plate, right mandible, ? . „ x 96. 



55. First maxilla, spines of outer lobe, <? . R. helleri. X 176. 



56. Small sensory spine from under surface of 4th joint, 5th perasopod, ^ • 



B. helleri. X 290. 



57. Plumose hair, from the same, X 290. 



58. Sensory seta from distal angle of 6tb joint, 5th perffiopod, $ . R. helleri. X 176. 



59. Dentate spine, terminal jomt of palp, right mandible, $ . „ x 176. 



60. Spine „ _ ., „ .. „ ? . „ x 176. 



61. Sensory filament, supe;ior antenna, $. R. helleri. X 290. 



62. Tip of finger, 2nd perteopod, $ . » X 290. 



63. „ „ 5th „ ?. „ X176. 



64. Coupling spines, right pleopod of first pair, 2, under surface. R.helleri. X 176. 



65. „ „ left „ „ „ „ „ ,, X176. 



