30 PROTOPLAST A FILOSA. 



less, doubly contoured, more or less distinctly punctate 

 or cancellated membrane like young colorless shells of 

 Arcella. When moving, usually more or less completely 

 surrounded by a delicate, transparent zone, finely and 

 regularly punctate. In the lateral view usually more or 

 less bell-shaped, with the fundus and sides defined by a 

 doubly contoured dotted line, and at the mouth with a 

 more translucent, wide, punctate band, defined by a 

 scarcely perceptible dentated edge. The shell is so 

 closely adherent and so flexible that it accommodates 

 itself to the changing form of the sarcode. Pseudopods 

 few, conical or awl-shaped, often irregular and sometimes 

 furcate. In spheroidal condition diameter 24/z to 56/*. 

 Hah. Springs, ponds, ditches, among algae and in ooze. 



vestitum. SYN. : Amphizonella vestita, 

 Archer ; C. pilosum, H. and L. ; C. vestitum, Archer. 



Body as in the preceding species, but more or less cov- 

 ered with minute, rigid cils. Diameter, 40// to 



SUB-ORDER IL PEOTOPLASTA FILOSA. 



Synopsis of the Genera of Filosa. 



Body colorless, invested with a hyaline, flexible PAOK . 



and elastic membrane apparently continuous 



with the sarcode, Pamphagus, 31 



Body covered with a thin, chitinoid shell, 



usually with extrinsic particles, pseudopods 



numerous and delicate, Pseudodifflugia, 33 



Shell retort-shaped, chitinoid, composed of 



minute, hexagonal elements in alternating 



series, long axis inclined, Cyphoderza, 34 



