584 PROTOZOOLOGY 



in ditches and pools in salt marshes, showing salinities 7.5-20.1 

 per cent in California. 



Genus Climacostomum Stein. Oval; flattened; right edge of 

 peristome without membrane, left edge, semicircular or spiral 

 with a strong adoral zone; peristomal field cihated; cytopharynx 

 long curved tube with a longitudinal row of cilia; macronucleus 

 band-form; contractile vacuole terminal, with 2 long canals; 

 fresh or brackish water. 



C. virens Ehrenberg (Fig. 265, c). 100-300/x long; with or with- 

 out zoochlorellae; fresh and brackish water. 



Family 6 Folliculinidae Dons 



Genus FoUiculina Lamarck. Lorica attached on broad surface; 

 neck oblique to perpendicular; sometimes with collar or spiral 

 ridge; neck uniform in diameter; salt water. 



F. moehiusi Kahl. (Fig. 265, d). Lorica about 500^ high. 



F. producta (Wright) (Fig. 265, e). Lorica yellowish brown; 

 250;u long; neck often long; Atlantic coast. 



Genus Microfolliculina Dons. Posterior end or sides of lorica 

 with sack-like protuberances. 



M. limnoriae (Giard). Lorica dark blue; pellicle faintly striated; 

 salt water. 



Genus PseudofoUiculina Dons. Lorica attached with posterior 

 end; more or less vertical; without ring-furrow in middle; with or 

 without style; salt water. 



P. ardica D. (Fig. 265,/). Lorica about 430^1 high, with spiral 

 ridge; off Norwegian coast 15-28 m. deep. 



Genus ParafoUiculina Dons. Neck of lorica with a basal swell- 

 ing ; attached either with posterior end or on a lateral surface ; salt 

 water. 



P. violacea (Giard) (Fig. 265, g). 200-300^ long; salt water. 



Family 7 Peritromidae Stein 



Genus Peritromus Stein. Ovoid; ventral surface flattened, dor- 

 sal surface with hump of irregular outhne bearing a few dorsal 

 setae; ciliary rows only on ventral surface; a small undulating 

 membrane at posterior end of peristome; short marginal spines; 

 2 macro- and 2 micro-nuclei; salt water. 



P. californicus Kirby (Fig. 265, h). Peristome short; left mar- 

 gin slightly concave; dorsal hump with wart-like protuberances, 



