252 REFERENCE TO PLATES. 



PLATE 72. 

 FIGURE. PAGE. 



70, 71. Umbraculum sinicum Grael. 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, .... 186 



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 Verrill, . . . .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 



