22 REFERENCE TO PLATES. 
Pian 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 Vayssiére,. . . . 186 
83. Tylodina citrina Joannis. After Joannis,. . . . . . . 186 
84, 85. Tylodina rafinesquii Phil.. After Philippi,. . . . . 187 
86, 87. Umbraculum cumingi Desh. Moll. Réun.,. . . . . 182 
PLATE 74. 
88-90. Pleurobranchus peronii Cuy. After Cuvier,. . . . 207 
91. Gymnotoplax americanus Verrill. After Verrill,. . . . 210 
92, 93. Pleurobranchus patagonicus Orb. After @’ Orbigny, . 200 
94. Koonsia obesa Verrill. After Verrill,. . . . 222 
95. Pleurobranchus stellatus Risso, teeth. ‘After Bergh, Rate Se! 
96. Pleurobranchus stellatus Risso, a plate of the jaw. After 
Vayssiére, .. . Se ees 
97, 98, Pleurobranchus aurantiacus Risso, teeth. After 
Bereh. ee . Pe eas 
99, Pleurobranchus aurantiacus Risso, jaw plate. After 
Bergh, . = ol nd treet) 
1. Pleurobranchus plumula Mont., jaw plates. After Sars, . 193 
2, 3. Pleurobranchus plumula Mont., teeth. After Sars, ... 1293 
4. Scaphander alatus Dall. Proc. U.S. Nat. Mus,. . . . 234 
5. Seaphander pustulosus Dall. Proc. U. 8. Nat. Mus.,. . 235 
6. Pleurobranchus monterosatoi Vayssiére, jaw plate. After 
Bershate ae onthe Tas» oy GaSe rrr 
te Pugnus parvus Hedley. After Hedley; . ... apes 
