PROTOMONADIDA 



135 



Genus Proterospongia Kent. Stalkless individuals embedded 

 irregularly in a jelly mass, with the collars protruding. 



Genus Sphaeroeca Lauterborn. Similar to the last genus, 

 but individuals with stalks and radiating. 



Genus Salpingoeca Clark. With a vase-like lorica to which 

 the stalked or stalkless organism is attached. 



Family 3 Bicosoecidae Poche 



Small monomastigote forms. With test. Solitary or colonial. 

 Collar rudimentary or developed. Holozoic. Fresh water. 



Fig. 46 a. Bicosoeca socialis. X555 (After Lauterborn). 



b. Fart oi a co\ony oi Poteriodendron petiolatum. X435 (After Stein). 



Genus Bicosoeca James-Clark. Test vase-like; body small, 

 ovoid with rudimentary collar, a flagellum extending through 

 it. The protoplasmic body is anchored to the base by a cyto- 

 plasmic process (flagellum?). A nucleus and a contractile vacu- 

 ole attached or free-swimming. 



Bicosoeca socialis Lauterborn (Fig. 46, a). Free-swimming 

 in fresh water. Lorica 23 microns by 12 microns; body about 

 10 microns long. 



Genus Poteriodendron Stein. Colonial; test is vase-shaped 

 and possesses a prolonged stalk. 



