PLATE XXXIII. 



PAGE 



Fig. 96. Pectex Maetixezexsis. Magnified. 1L*8 



Fig. 97. P. complexicosta. Natural size. 199 



97 «. Magnified view of the surface. 



Fig. 98. 98 a. P. ixtee-radiata. Natural size. 199 



Fig. 99. Neithea geandicosta. Magnified. 200 



99 a. Section of the ribs. 



Fig. 100. Lima Shastaexsis. Magnified. 201 



Fig. 101. L. mtltiradiata. Natural size. 201 



Fig. 102. Axomia Vaxcouverexsis. Natural size. 202 



Fig. 103 5, c, d. Ostrea Ideiaexsis. Young. 203 



