442 EXPLANATION OF PLATES, 



55,56. Septocardia rara, Meek. Cretaceous; U.Missouri, 234 

 57-59. Matheria tenera, Billings. Trenton Group ; Canada, 234 

 60. Pleuromeris tridentata, Conrad. Miocene; Southern 



Atlantic United States, ...... 283 



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 sulcata, Lam. Mediterranean, . . . 231 



68. Cardita antiquata, Linn. Ceylon, .... 231 



69. Mytilieardia variegata, Brug. China, .... 232 

 70,71. Mytilieardia (Azarella) semiorbiculata, Linn. Phil., 232 



72. Carditamera pectunculus, Brog. Madagascar, . . 232 



73. Yenericardia planicostata. Lam., ..... 233 



74. Cyelocardia borealiSjConr. N. Atlantic Coast of TJ. S. 233 



75. Unio (Bariosta) emarginatus. Lea. Hab. unknown, . 288 



76. Unio (Naiadea) modioliformis. Lea. U, States, .. . 238 



77. Unio (Naia) depressuSjLam. Australia, . . . 238 



78. Unio (Hyridella) hatavus, Lam. Europe, . . . 239 



79. 80. Unio (Obovaria) retusus, Lam. Ohio River, . 239 

 81. L^nio (Lampsilis) elegans. Lea. Ohio River, . . 239 



' 82. Unio (Canthj'ria) 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 States, . . 239 



86. Unio littoralis, Linn. ^. France, , . . . 238 



87. Liocyma fluctuosa, Gould. Massachusetts, . . 183 



Plate 124. 



88. 89. Margaritana margaritifera, Linn. North. Europe 



and America, . . . . . . . . 240 



90. Monocondylsea Guarayana, d'Orb. Bolivia, . . 240 



91. Plagiodon Isocardioides, Lea. So. America, . . 241 



92. Dipsas plicatus, Leach. China, ..... 241 



93. Byssanodonta Paranensis, d'Orb. R. Parana, S. Am., 268 

 ' 94. Auodonta (Patularia) latomarginata. 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. ^. River Nile,. . , . 242 

 J 00. Iridina (Pleiodon) ovata, Swains. Central Africa, . 242 



1. Triquetra corrugata, Lam, Brazil, .... 243 



