442 
EXPLANATION OF PLATES, 
FIGURE, 
55, 56. Septocardia rara, Meek. Cretaceous ; 
U. Missouri, 
PAGE. 
234 
57 59. Matheria tenera, Billings. Trenton Group; Canada, 234 
60. 
Pleuromeris tridentata, Conrad, Miocene; Southern 
Atlantic United States, . 233 
PLATE 123. 
63. Solemya Australis, Lam. Australia, . : : 223 
64. Crassatella Antillarum, Reeve. West Indies, 224 
65. Astarte Danmoniensis, Mont. N. Europe, 226 
66. Gouldia cerina, Adams. West Indies, 179 
67. Cardita suleata, Lam. Mediterranean, 231 
68. Cardita antiquata, Linn. Ceylon, 231 
69. Mytilicardia variegata, Brug. China, . 232 
70, 71. Mytilicardia (Azarella) semiorbiculata, Linn, Phil, 232 
72. Carditamera pectunculus, Brug. Madagascar, 232 
73. Venericardia planicostata, Lam., , . 233 
74. Cycloeardia borealis, Conr. N. Atlantic Coast of U. 8. 233 
15. Unio (Bariosta) emarginatus, Lea. Hab. unknown, . 238 
76. Unio (Naiadea) modioliformis, Lea. U. States, . 238 
77. Unio (Naia) depressus, Lam. Australia, 238 
78. Unio (Hyridella) batavus, Lam. Europe, . 239 
79, 80. Unio (Obovaria) retusus, Lam. Ohio River, 239 
81. Unio (Lampsilis) elegans, Lea. Ohio Riv er, 239 
82. Unio (Canthyria) spinosus, Lea. Georgia, 239 
83. Unio (Iridea) cylindricus, Say. United States, 239 
84. Unio (Dysnomia) plicatus, Lesueur. U. States, . 239 
85. Unio (Metaptera) alatus, Say. United ee 239 
86. Unio littoralis, Linn. 3. France, 238 
87. Liocyma fluctuosa, Gould. Massachusetts, 183 
PLATE 124. 
88, 89. Margaritana gl Reo Linn. North. peeaee 
Aen America, 249 
90. Monocondyla Guara ana, a’ Orb. Bolin ia, 240 
91. Plagiodon [soeardioides, Lea. So. America, 241 
92. Dipsas plicatus, Leach. China, . ‘ . 241 
93. Byssanodonta Paranensis, d ‘Orb. RB. Parana, S. Am., 268 
94. Anodonta (Patularia) latomar ginata, Lea. Paraguay, , 242 
95. Anodonta (Gonidea) angulata, Conr. Oregon, 242 
96. Anodonta cygnea, Linn. Europe, 242 
97. Carbonicola acuta, J. Sowb. Carb.; Europe, . 236 
98. Schizodus ( Prisconaia) ventricosa, Conr. Carbonif. ; 
Kansas, : : 247 
99. Iridina exotica, Lam. 4. River Nile,. 242 
100. Iridina (Pleiodon) ovata, Swains. Central Afriea, 242 
1. Triquetra corrugata, Lam. Brazil, 243 
