PLATE XXX. 



PAGE 



Fig. 72. TKLLINA HOFFMANN IAN A. Natural size. 182 



Fig. 74. ? T. UNDUXIFERA. Natural size. 183 



Fig. 75. DONAX LATUS. Natural size. 183 



Fig. 76. VENUS JEQUILATERALIS. Natural size. 184 



Fig. 77. ? MERETRIX FRAOILIS. Natural size. 185 



Fig. 78. M. HORNII. Natural size. 185 



Fig. 79. CARYATIS NITIDA. Natural size. 186 



Fig. 80. ? THETIS ELONGATA. Magnified. 186 



80 a. End view. 



Fig. 81. CARDIUM (LJEVICARDIUM) ANNULATTTM. Natural size. 187 



Fig. 82. C (PROTOCARDITJM) TRANSLUCIDUM. Magnified. 187 



Fig. 83. Section of ribs of CARDITA HORNII when perfect. 187 



83 a. The same when weathered. 



83 b. Section of ribs of C. PLANICOSTA for comparison. 



Fig. 84. Hinge of CLISOCOLUS DTJBIUS. Eight valve. 189 



Fig. 85. CRASSATELLA COMPACTA. Natural size. 190 



Fig. 86. UNIO HUBBARDII. Natural size. 190 



86 a. End view. 



