16 ZOOLOGY 
Gromia is a form found in both fresh and salt water ; it has a 
membranous shell of the imperforate type, with an opening at 
“I 
Fic. 11.—Gromia oviformis, 
Duj. 
. The shell. 
. Protoplasm inside the 
shell. 
. Protoplasm outside the 
shell. 
. Numerous nuclei. 
. A Diatom surrounded by 
pseudopodia. 
. Pseudopodia anastomos- 
ing. 
. Ingested diatoms. 
one or both ends, from these the protoplasm passes out and forms 
a layer round the outside of the shell, from which the fine 
reticulating pseudopodia arise. The shell is thus completely 
imbedded in protoplasm, both inside and outside. In Lieber- 
