| Fig. | Page | |
|---|---|---|
| 282 . | Construction for determining the length of the coiled spire | 551 |
| 283 . | Section of the shell of Triton corrugatus (Woodward) | 554 |
| 284 . | Lamellaria perspicua and Sigaretus haliotoides ( do. ) | 555 |
| 285 ,ã6. | Sections of the shells of Terebra maculata and Trochus niloticus | 559, 60 |
| 287 ã9. | Diagrams illustrating the lines of growth on a lamellibranch shell | 563ã5 |
| 290 . | Caprinella adversa (Woodward) | 567 |
| 291 . | Section of the shell of Productus (Woods) | 567 |
| 292 . | The ãskeletal loopã of Terebratula ( do. ) | 568 |
| 293 ,ã4. | The spiral arms of Spirifer and of Atrypa ( do. ) | 569 |
| 295 ã7. | Shells of Cleodora , Hyalaea and other pteropods (Boas) | 570, 1 |
| 298 ,ã9. | Coordinate diagrams of the shell-outline in certain pteropods | 572, 3 |
| 300 . | Development of the shell of Hyalaea tridentata (Tesch) | 573 |
| 301 . | Pteropod shells, of Cleodora and Hyalaea , viewed from the side (Boas) | 575 |
| 302 ,ã3. | Diagrams of septa in a conical shell | 579 |
| 304 . | A section of Nautilus , shewing the logarithmic spirals of the septa to which the shell-spiral is the evolute | 581 |
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