PLATE XXI. 



PAGE 



Pig. 91. Tukritella chicoensis. Magnified. 133 



Fig. 92. T. Uvasana. Natural size. 134 



Fig. 93. T. Saffordii. Natural size. 135 



Fig. 94. T. robusta. Natural size. 135 



Fig. 96. Nerita deformis. Natural size. 137 



Fig. 97. N. cuneata. Natural size. 137 



Fig. 98. Lysis duplicosta. Natural size. 138 



Fig. 99. Dentalium ( ? Ditrupa) pusillum. Magnified. 139 



Fig. 100. D. Cooperii. Natural size. 139 



Fig. 101. D. stramineum. Natural size. 139 



Fig. 102, a. Emarginula radiata. Magnified. 140 



Fig. 103. Patella Traskii. Natural size. 140 



Fig. 104. Helcion dichotoma. Magnified. 141 



Fig. 105. Anisomyon Meekii. Natural size. 142 



Fig. 106. Act.eon imprkssus. Magnified. 142 



Fig. 107. Cylichna costata. Natural size. 143 



Fig. 108. Megistostoma striata. Natural size. 144 



a. Back view. 



b. Magnified view of surface. 



Fig. 109. Fusus flexuosus. Magnified. 85 



Fig. 110. Perissolax Blakei. Natural size. 92 



Fig. 111. Amauropsis alveata. Var . Natural size. 110 



Fig. 112. Naticina obliqtja. Magnified. 109 



Fig. 113. Niso polita. Magnified. tl6 



Fig. 114. Cerithiopsis alternata. Natural size. 116 

 114, n. Magnified view of body volution. 



