DRAWINGS IN THE TEXT 



FIG. 



1. Marine Zones 9 



2. The Relation between Salinity and Rainfall in Ballv- 



NAKiLL Harbour 23 



3. Chart of Co-Tidal Lines . . . ^, . • • 29 



4. Variation in Purpura lapillus 72 



5. Shell Forms in relation to Mode of Life . . 74 



6. AVICULARIUM of POLYZOAN 87 



7. Pedicellari^ of Sea-urchin {Echinus) .... 88 



8. Spider-crab partly masked by Sponge on Front of 



Carapace .92 



9. Spine of Sea-urchin . ' loi 



10. Autotomy of Crab's Leg 120 



11. Crab {Mtlia tessellata) BEARING IN its Claws Two Anemones 138 



12. Positions occupied by Pedal Disc of Anemone . . 161 



13. Migration of Edible Crab i74 



14. Periophthalmus on Mud Flat 207 



15. Butterfish {Centronotus gunnelius) protecting Eggs . . 254 



16. Nest of Fifteen-spined Stickleback .... 256 



17. Larv/E of Common Shore Animals 259 



18. Spawn of Shore Animals 273 



19. Food of Black-headed Guli 290 



20. Common Shore Alg^ 3^4 



21. Common Shore ALGif: 3°^ 



22. Chart OF Portion of Balloch Bay . . ") -r- z^// 



> To foUoiv 314 



23. Balloch Bay : Sections . . . • ) 



xiv 



