The Sarcodina 251 



water, "bending, undulating, quivering, and putting out side branches 

 which meet and fuse and so establish the reticulum" (66). Myxopodia 

 often appear to be covered with mucus which leaves a trail as the pseudo- 

 podia are retracted. The pseudopodia, in species with imperforate tests, 



\ 





Fig. 5. 35. AC. Addition of a new chamber to the test in Discorbina 

 bertheloti, x45 (after Le Calvez): A. Pseudopodia have been retracted and 

 an arenaceous cyst formed over the area of the future chamber; test shown 

 schematically, pores indicated in one chamber. B. Pseudopodia have been 

 retracted further and the form of the new chamber is evident. C. The first 

 layer, a thin chitinous membrane, has been secreted; pores are formed. D-F. 

 Changes in form of the pseudopodia during early development of Iridia 

 diaphana (after Le Calvez): D. Creeping "embryo" as it emerges from the 

 parental test, xlOO. E. Later pelagic stage with bristle-like pseudopodia, xl50. 

 F. At the beginning of fixation; typical pseudopodia are developing and the 

 "bristles" of the pelagic stage are disappearing, xll5. Compare with later 

 stage of development (Fig. 5. 40, E) in which the myxopodia have increased 

 in size. 



