340 



PROTOZOOLOGY 



C. utriculus Stokes (Fig. 138, b). About 11/x long; attached to fresh- 

 water plants. 



C. disjuncta (Fromentel) (Fig. 138, c). In stellate clusters; cells 

 about 15ju long; fresh water. 



Fig. 138. a, Phalansterium digitatum, X540 (Stein); b, Codosiga 

 utriculus, X1340 (Stokes); c, C. disjuncta, X400 (Kent); d, Monosiga 

 ovata, X800 (Kent); e, M. robusta, X770 (Stokes); f. Desmarella monili- 

 formis, X800 (Kent); g, Protospongia haeckeli, X400 (Lemmermann) ; 

 h, an individual of Sphaeroeca volvox, X890 (Lemmermann); i, Diplosiga 

 francei, X400 (Lemmermann); j, D. socialis, X670 (France^. 



Genus Monosiga Kent. Solitary; with or without stalk; occasion- 

 ally with short pseudo podia; attached to freshwater plants. Several 

 species. 



M. ovata K. (Fig. 138, d). 5-15/x long; with a short stalk. 



M. robusta Stokes (Fig. 138, e). 13m long; stalk very long. 



Genus Desmarella Kent. Cells united laterally to one another; 

 fresh water. 



D. moniliformis K. (Fig. 138,/). Cells about 6ju long; cluster com- 

 posed of 2-12 individuals; standing fresh water. 



D. irregularis Stokes. Cluster of individuals irregularly branching, 

 composed of more than 50 cells; cells 7-1 1m long; pond water. 



