BHIZOPODA 19 



Family 3. EUGLYPHIDAE. 



Shell membranous and composed of plates of chitin or silica 

 enclosing a single chamber with a single large opening; pseudopodia 

 filiform and sometimes somewhat anastomosing; size minute: 5 genera; 

 mostly in fresh water. 



1. EuGLYPHA Dujardin. Shell elongate, ovate, often with spines 

 at hinder end and composed of oblique rows of round plates whose 

 edges overlap, making hexagonal areas; opening denticulate; pseudo- 

 podia fine, often branching but not reticulate: in fresh water; 4 

 species. 



E. alveolata Duj. (Fig. 13). Shell colorless, elongated v. / 



and cylindrical ; hinder end broader, usually with a few \ iz/y^ 



long spines; plates composing it are round or oval; length 

 .15 mm.: common. 



E. ciliata Leidy. Shell elongate and elliptical in J^^ 



cross section; hinder end and sides with numerous short 

 spines ; plates six-sided ; length .1 mm. : common in 

 sphagnum moss. ■ar^ir.j 



2. Cyphoderia Schlumberger. Shell retort-shaped 

 and composed of minute plates; opening turned to one Figri4 

 side; forward half of body contains numerous contractile Cyphoderia 



ampulla 



vacuoles, and hinder half the nucleus; color yellowish: (Leidy). 

 2 species; in fresh and salt water. 



C. ampulla (Ehrenberg) (Fig. 14). Length .17 mm.: in ponds and 

 ditches. 



Suborder 2. RETICULARIIDA. 



Pseudopodia filiform and reticulate; calcareous shell usually pres- 

 ent which has either one or more large openings or many minute ones, 

 through which the pseudopodia project: 3 divisions. 



Key to the divisions of Reticulariida : 



Qi No shell present 1. Nuda 



Oo Shell with one or more large and no miritite openings 2. Imperforina 



as No large but numerous minute openings 3. Perforin A 



Division 1. NUDA. 



Rhizopods without shell and with reticulate pseudopodia: about 8 

 genera; mostly marine. 



BiOMYXA Leidy. Form incessantly changing; nucleus present or 

 apparently absent: 1 species. 



B. vagans Leidy. Color pale gray with oil globules, nucleus when 

 present large and distinct; no ectosarc: in sphagnum moss. 



