CLASSIFICATION. 37 
those of the Heliozoa; and with one or more usually- 
obscure nuclei. 
Genera: (11) Vampyrella, (12) Hyalodiscus, (18) 
Nuclearia, (14) Archerina. 
Order II. CONCHULINA. 
(Testacea,* Max Schultze.) 
Rhizopods furnished with a test, of variable shape 
and construction. 
Family 1. -ARcBLiqpa. 
Test chitinous, with or without extraneous matter 
adhering; monothalamous; nucleus single or multiple ; 
contractile vacuoles one or several. 
Genera: (15) Arcella, (16) Pseudochlamys, (17) 
Centropyxis, (18) Difflugia, (19) Pontigulasia, (20) 
Difflugiella, (21) Lecquereusia, (22) Nebela, (28) Hya- 
losphenia, (24) Heleopera, (25) Quadrula, (26) Cochlio- 
podium, (27) Leptochlamys, (28) Phryganella. 
Family 2. Evonypuina. 
Test homogeneous, or composed of chitinous or 
siliceous plates often of geometrical pattern; spinous 
or naked. Pseudopodia filose, sharply pointed, simple 
or branched, but not anastomosing, of variable length, 
emitted from the mouth of the test. 
Genera: (29) Huglypha, (80) Placocista, (31) Assu- 
lina, (82) Cyphoderia, (838) Trinema, (84) Corythion, 
(35) Sphenoderia, (36) Canvpascus, (87) Pamphagus. 
Family 3. GRomirna. 
Test membranous, pellucid, rarely covered with ex- 
traneous matter; with a single aperture. Pseudopodia 
long, branching, straight, or irregularly dendroid, fre- 
quently anastomosing. 
* Pre-occupied in Mollusca. 
