252 REFERENCE TO PLATES. 



PLATE 72. 



FIGURE. PAGE. 



70, 71. Umbraculum sinicum Gmel. U. S. Expl. Exped., . . 180 



72-74. Umbraculum plicatulum Mts. C. Mittheil, 178 



75, 76. Haliotinella patinaria Guppy. Journ. de Conch., . .210 



PLATE 73. 



77-82. Tylodina citrina Joannis. After Vayssiere, . . . . 1 86 



83. Tylodina citrina Joannis. After Joannis, 186 



84, 85. Tylodina rafinesquii Phil. After Philippi, 187 



86, 87. Umbraculum cumingi Desh. Moll. Reun., 182 



PLATE 74. 



88-90. Pleurobranchus peronii Cuv. After Cuvier, .... 207 



91. Gymnotoplax americanus Verrill. After Yerrill, . . . . 210 



92, 93. Pleurobranchus patagonicus Orb. After d'Orbigny, . 200 



94. Koonsia obesa Verrill. After Verrill, 222 



95. Pleurobranchus stellatus Risso, teeth. After Bergh, . . 194 



96. Pleurobranchus stellatus Risso, a plate of the jaw. After 



Vayssiere, 194 



97. 98, Pleurobranchus aurantiacus Risso, teeth. After 



Bergh, ^ 195 



99. Pleurobranchus aurantiacus Risso, jaw plate. After 



Bergh, 195 



1. Pleurobranchus plumula Mont., jaw plates. After Sars, . 193 



2, 3. Pleurobranchus plumula Mont., teeth. After Sars, . .193 



4. Scaphander alatus Dall. Proc. U. S. Nat, Mus., .... 234 



5. Scaphander pustulosus Dall. Proc. U. S. Nat. Mus., . . 235 



6. Pleurobranchus monterosatoi Vayssiere, jaw plate. After 



Bergh, 196 



7. Pugnus parvus Hedley. After Hedley, 234 



