DESCRIPTION OF PLATES 



FRONTISPIECE 



Transverse Section of an Echinus Spine Echinometra lucunter. 

 For details, see page 57. 



PLATE I 



FIG. i. Improvised Photo-micrographic Apparatus. 

 See page 19. 



FIG. 2. Adjustable Photo-micrographic Camera. 

 See page 21. 



FIG. 3. The Author's Photo-micrographic Camera. 

 See page 27. 



PLATE II 



FIG. 4 E. R. & C. Camera with Microscope. Arranged 



for use without Eye -piece. 



See page 26. 



FIG. 5. E. R. & C. Camera, and Microscope fitted with Com- 

 pound body and Ocular. The camera is run back on its 

 sliding bed to permit adjustments of object and illumina- 

 tion by the microscope. 



See page 26. 



FIG. 6. E. R. & C. Camera with Microscope, arranged 



for High Power Work. 



See page 26. 



