20 Fishery Board for Scotland. 



PLATE III. 



Fig. 29. Portunus puher. First Young Stage. 



30. ,, ,, IV. Zoea, abdomen. 



31. ,, depurator, I. Zoea, fig. 31a, do., nat. size. 



32. ,, puher, III. Zoea, abdomen. 



33. „ ,, 11. „ Telson. 



34. ,, ,, V. ,, antenna. 

 34a. ,, ,, V. ,, nat. size. 



35. ,, ,, II. Zoea, abdomen. 



36. „ „ II. „ 



37. ,, ,, II. ,, abdomen. 

 38 ,, ,, V. Telson; certain of the long spjnes are damaged. 



39. 5, depurator, I Zoea, Telson. 



40. ,, puher, V. Zoea, abdomen. 



41. ,, depurator, I. Zoea; abdomen twisted slightly. 



42. ,, puher. III. Zoea, Telson. 



43. „ ,, III. ,, fig. 43a, do., nat size. 



44. ,, depurator, I. Zoea, abdomen, third and fourth segments seen in 

 ventral view. 



45. Portunus puher, I. Zoea, abdomen ; a portion of the hind gut is everted. 



46. , , , , IV. Zoea ; fig. 46a, do. , nat. size. 



47. ,, j> I- Zoea, Telson. 



48. „ „ IV. „ „ 



49. ,, j> !• Zoea, carapace seen from above. 



PLATE IV. 



Fig. 50. Cancer pagurus, I. Zoea, mandible, inner lobe. 

 ,,51. ,, ,, Protozoea. 



,, 52. ,, ,, I. Zoea, mandible seen fi-om below ; fig. 52a, do., mandible 



seen from outside. 

 ,, 54. Cancer pagurus, I. Zoea, view of buds of pereiopods, maxillipedes, and first 



and second segments of abdomen. 

 ,, 55. Cancer pagw^is, I. Zoea, first and second maxillipedes. 

 ,,56. ,, ,, ,, ventral view of sac in which the pereiopods lie. 



,, 57. ,, ,, Protozoea, cephalic region seen from below. 



,, 58. ,, ,, I. Zoea, antennule. 



,, 59. ,, ,, ,, cephalic region seen from below. 



,,60. ,, ,, ,, second maxilla. 



,, 61. ,, ,, Protozoea, second maxillipede. 



,,62. ,, ,, ,, Telson; the appendages have been slightly 



damaged. 

 ,, 63. Cancer pagurus, 1. Zoea, Telson; fig. 63a, do., carapace showing lateral 



spines. 

 ,, 64. Cancer pagurus, I. Zoea, eye stalks, seen from above; carapace removed. 

 „ 65. ,, ,, ,, abdomen. 



,, 66. ,, ,, ,, antemia. 



,, 67. ,, ,, ,, first maxilla. 



PLATE V. 



Fig. 68, 68a. Eggs of Nematode parasite of adult Hyas areneus. 



,, 69. Eggs as above (fig. 68), a day later. 



,, 70. Hyas areneus, I. Zoea, Telson. 

 „ 71. „ „ IL „ 



,,72. ,, ,, First Young Stage ; cephalic region, dorsal vie■n^ 



,, 73. 5, ,, I. Zoea; fig. 73a, do., nat. size. 



,, 74. ,, ,, Megalops, coxopodite, etc., joints of the pereiopods, showing 



the teeth {t). 



,, 75. Hyas areneus, I. Zoea, cephalic region seen from above. 

 ,,76. ,, ,, First Yoimg Stage. 



,, 77. ,, ,, I. Zoea, abdomen. 



,,78. ,, ,, ,, carapace to show lateral spines. 



,,79. ,, ,, adult, carapace removed to show the parasitic nematodes, 



71, n' ; I, liver ; ov. , ovary. 



,, 80. Hyas areneus, II. Zoea, Telson. 

 ,,81. ,, ,, I. ,, antenna. 



,, 82. Po?'i?t?iMs ^?«5er, I. Zoea, antennule and antenna. 



,, 83. Hyas areneus, Megalops, side view of dorsum of carapace. 



,, 84. Portunus depurator, I. Zoea, carapace to show lateral spines. 

 ,, 85. ,, Iwlsatus, ,, ,, ,, ,, ,, 



