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i. Oyster brood on full-grown oysters. 2. Shells showing films built up by oyster 

 to exclude diseased growth. 3. Oyster anchored to two links of chains. 

 4. Button oyster. 5. Pipe with two brood in bowl. 6. Brood on winkle. 7. Pipe 

 covered by Ross worm. 8. Spat on a slate. 9. Shells with spat. 10. Right and 

 left handed whelk. n. Crab with brood on its back. 12. Brood on broken 

 tumbler. 13. Shell with mussels. 14. Whelk shells. 15. Brood on neck of old 



bottle. 



