PLATE XX. 



PAGE 



Fig. 72. Architectonica cognata. Natural size. 117 

 a. Magnified view of markings on the upper surface. 

 />. Section, showing the marginal costation. 



c. Section, from A. bilineata (=alveata), from the Eocene of the 



East, to show the specific difference. 



Fig. 73. A. inornata. Natural size. 118 



Fig. 74. Margaritella crenulata. Magnified. 118 



Fig. 75. Discohelix Leana. Magnified. 119 



Fig. 76. Straparollus paucivolvus. Magnified. 120 



Fig. 77. a—c. S. lens. Magnified. 120 



d. Section of allied form, from the same locality. 



Fig. 78. Angaria ornatissima. Magnified. 121 



Fig. 79. Conus Remondii. Magnified. 122 



Fig. 80. Rimella simplex. Natural size. 124 



Fig. 81. Pugnelltjs hamulus. Natural size. 124 



Fig. 82. Tessarolax distorta. Natural size. 126 



Fig. 83. Aporrhais ealciformis. Natural size. 127 



Fig. 84. A. angulata. Natural size. 128 



Fig. 85. Potamides diadema. Natural size. 130 



Fig. 86. P. tenuis. Magnified. 130 



Fig. 87. Ti^rritella tnfralineata. Natural size, and magnified. 131 



Fig. 88. T. seriatim-granulata. Natural size, and magnified. 132 



Fig. 89. ? Littorina compacta. Magnified. 131 



Fig. 90. Turritella Veatchii. Magnified. 133 



Fiar. 95. Gat.erus excentrtcus. Natural size. 136 



