20 PROTOZOA 



DIVISION 2. IMPEEFORINA. 



Rhizopods with shell which has one or more large openings from 

 which project reticulate and anastomosing pseudopodia; shell usually 

 calcareous, but sometimes membranous, to which sand may adhere, and 

 one or many chambered: 4 families. 



FAMILY GBOMIIDAE. 



Marine and fresh-water rhizopods with a membranous shell with 

 an opening at one or both ends : 10 genera. 



Key to the genera of Gromiidae here described: 



Oi Shell with but one opening. 

 &! Pseudopodia richly anastomosing ; contractile vacuoles usually present. 



1. GROMIA 

 6 2 Pseudopodia anastomosing little ; numerous contractile vacuoles. 



2. PAMPHAGUS 

 c a Shell with an opening at each end 3. DIPLOPHBYS 



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Fig. 15 Gromia lagenoides (Calkins). 



1. GROMIA Dujardin. Shell spherical or ovate in shape and entirely 

 filled by the protoplasmic body; shell membranous and often flexible, 

 changing its shape; pseudopodia very fine and reticulate; nuclei one or 

 many : several species ; in fresh and salt water. 



G. lagenoides Gruber (Fig. 15). Body about .25 mm. long, with 

 opening at larger end of shell; edge of opening turned in; a fine layer 

 of protoplasm surrounds the shell which has fine reticulate pseudopodia 

 on all sides of it; shell either with or without foreign bodies: Woods 

 Hole; not numerous. 



2. PAMPHAGTJS Bailey. Pseudopodia very delicate, springing from 

 a common protoplasmic base and not anastomosing; shell flexible and 

 delicate, and filled by the protoplasmic body; opening of shell narrow: 

 7 species. 



