FORAMINIPEEA OF THE KEEIMBA AECHIPELAGO. 



PLATE XXXVI. 



Iridia diaj)Jicma. 



Fig. 1. Primordial stage, attached to a sand-grain. X 40. 



2. Primordial stage, attached to a fragment of Zostera. X 20. 



3. Primordial stage, specimen showing terminal aperture. X 35. 



4, 5. Primordial stage, inferior surface of detached specimens, showing the 

 chitinous pellicle across the base. X 40. 



6. Adult specimen, showing superior surface. X 20. 



7. Adult specimen, showing inferior surface with chitinous pellicle. X 20. 



8. Adult specimen showing inferior surface. X 35. The protoplasmic body 



is seen in a contracted mass in the central cavity, under the transparent 

 chitinous pellicle. 



9. An adult irregularly formed specimen, showing the protoplasmic body (under 



the chitinous pellicle), furcating and penetrating into the different " lodges " 

 of the test. X 20. 



10. A detached specimen, which had formed its test in the crevices between sand- 



grains, viewed as a transparent object mounted in balsam. The contracted 

 protoplasm is seen as a ball lying in the drum-shaped space between the 

 two chitinous membranes. X 30. 



11. A large attached specimen of a regular depressed type. X 18. 



12. A large attached specimen of a wild-growing furcating type. X 12. 



