CONTENTS. 



XV 





Page 



Family III. — Phyllididce 



- 141 





- 141 



15. Chitonellus - 



- 142 



16. Chiton - 



- 142 



17. Patella - 



- 143 



18. Siphonaria - 



- 146 



Family IV. — Semi-Phyllididce 



- 147 



19. Pleurobranchus 



- 147 



20. Umbrella 



- 147 



Family V. — Calyptrceidcs 



- 148 



21. Parmophorus 



- 149 



22. Emarginula - - - 



- 149 



23 Fissnrella - 



_ 150 



24. Crepidula - 



- 151 



25. Calyptraea ... 



- 152 



26. Hipponyx - 



- 153 



27. Pileopsis - 



- 154 



Family VI. — Bullceidce 



- 155 



28, Acera - 



- 155 



29. Bullae 



- 155 



30. Bulla 



- 156 



Family VII. — Aplysidce 



- 157 



31. Aplysia - 



- 157 



32. Dolabeila 



- 158 



Family VIII. — Limacidce 



- 159 



33. Onchidium - 



- 159 



34. Limax - 



- 160 



35. Parmacella - 



- 160 



36. Testacella - 



- 160 



37. Vitrina 



- 162 



