REFERENCE TO PLATES. 229 



FIGURE PAGE 



69. Rumina decollata lanceolata Bgt. Mai. Alg 214 



70. Rumina decollata L. Moll. France 212 



71. Rumina decollata flammulata Bgt. Rossm., Iconogr. 214 



72. Rumina decollata flammulata Bgt. Mai. Alg 214 



PLATE 54. 



73-79. Riebeckia sokotorana Marts. Conch. Mittheil. . . . 205 



80. Riebeckia gollonsirensis G.-A. Socotra Exped 206 



81. Riebeckia gollonsirensis G.-A. P. Z. S 206 



82. Riebeckia decipiens Sm. Conch. Mittheil 206 



83. Riebeckia. decipiens Sm. Socotra Exped 206 



84. Riebeckia insculpta Sm. Socotra Exped 208 



PLATE 55. 



85. 86. Riebeckia adonensis G.-A. P. Z. S 207 



87, 88. Riebeckia adonensis G.-A. Conch. Mittheil 207 



89, 90. Riebeckia arguta Martens. Conch. Mittheil. .... 209 



91,92. Riebeckia hirsuta G.-A. (= arguta). P. Z. S. . . 210 



93. Riebeckia Jessica G.-A. ( arguta) . P. Z. S 210 



94, 95. Trichodina barbigera Morel. Ser. Conch 182 



96. Trichodina marmorea Rve. C. Icon 182 



97. Riebeckia enodis G.-A. P. Z. S 208 



98. Riebeckia enodis G.-A. Socotra Exped 208 



99. Rumina decollata L. After Dupuy 212 



I, 2, 3. Rumina. decollata gracilis Pfr. After Kobelt. . . 215 



PLATE 56. 



4. Trichodina moniticola Morelet. Voy. Welwitsch 186 



5-8. Trichodina monticola Morelet. After Girard 186 



9, 10. Trichodina clavus Pfr. Specimens 184 



II. Trichodina clavus Pfr. After Reeve 184 



12. Trichodina paxillus Reeve. After Reeve 186 



13. Trichodina massoniana Crosse. J. de Conch 184 



14. 15. Trichodina massoniana Crosse. Specimen 184 



16, 17. Trichodina aratispira Pils. Specimen 185 



18, 19. Trichodina lotophaga Morel. Fer., Hist 191 



20. Trichodina lotophaga Morel. Ser. Conch 191 



PLATE 57. 



21, 22. Trichodina cornea Morel. J. de Conch 189 



23. Trichodina cornea Morel. Specimen 189 



24. Trichodina monacha Morel. J. de Conch.. , 188 



