xiv 



CONTENTS. 



Page 



Division II. — Ligament not marginal - 121 



Family IV. — Pectenidce - - - 121 



77. Pedum - - - - 121 



78. Lima - - - - 122 



79. Pecten - - - - 123 



80. Plicatula - - - - 125 



81. Spondylus - - - - 125 



Family V. — Ostreidcs - - - 126 



82. Ostrea - - - - 126 



83. Placuna - - - - 129 



84. Placunanomia - - - 130 



85. Anomia - - - - 132 



PART IV.— MOLLUSCA or UNIVALVES - 133 



Order I. — Pteropoda - 



1. Hyalaea 



2. Clio - 



3. Cleodora 



4. Limacina 



5. Cymbulia 



6. Pneumodermon 



Order II. — Gasteropoda 

 Family I. — Tritonidce 



7. Glaucus 



8. Eolis 



9. Tritonia 



10. Scyllaea 



11. Tethys 



12. Doris 



- 136 



- 136 



- 136 



- 137 



- 137 



- 138 



- 138 



- 139 



- 139 



- 140 



- 140 



- 140 



- 140 



- 140 



- 140 



Family II. — DentalidcB - - - 140 



13. Dentalium - - - - 140 



