X ILLUSTRATIONS IN THE TEXT. 



FIGS. PAGE 



56. C. morns : liver . . . . .88 



57. C. tesseUata : oral tentacles . . .91 



58. tentacular filament . . 91 



59. C. echinata : ,, ,, . .95 



60. Styela tuberosa : reproductive organs . . 101 



61. ovaries . . . 102 



62. 8. informis : tentacular filaments and branchial 



tubercle . . . . .105 



63. 8. opalina : test. .... 109 



64. 8. pomaria : anal aperture . . .112 



65. 8. granulata : . . .112 



66. ,, digestive and reproductive organs 116 



67. 8. oljscura : tentacular filaments . .119 



68. digestive organs . . .119 



69. anal aperture . . . 119 



70. 8. comata : ovary . . . .121 



71. anal aperture . . .121 



72. 8. vestita . . .121 



73. test ..... 122 

 74. ,, tentacular filaments . . . 123 



75,76. o vary , two views . . . 124 



77. 8. fibrillata : ovai'ies .... 126 

 78. anal aperture . . . 126 



79. 8. northumbrica ., ,,..', 126 



80. ,, reproductive organs . . 127 



81. Pulonaia corrugata : part of branchial sac . 141 

 82.- test . . .147 



83. P. glnbra : test . . . . .147 



84. anatomy .... 147 



85^ 86. -Perophora Lister i : test, two views . .156 



87.AMolyula . . . . .162 



