SUCTORIA 699 



0. porcellanum Kent (Fig. 328, c). 60-100^ long; on Porcellana 

 platycheles, etc. 



0. belgicum Fraipont (Fig. 328, d). 38-1 14/i long; vermicular form 

 100)u; on Bryozoa and hydrozoans; Vancouver (Wailes). 



Family 3 Dendrocometidae Stein 



Genus Dendrocometes Stein. Body rounded; with variable num- 

 ber of branched arms; fresh water. 



D. paradoxus S. (Fig. 328, e). Up to 100m long; on Gammarus 

 pulex, G. puteanus, etc. 



Genus Stylocometes Stein. Arms not branched; tentacles finger- 

 like ; fresh water. 



S. digitatus (Claparede and Lachmann). Up to llOju long; on the 

 gills of Asellus aquaticus and on Aphrydium versatile. 



Family 4 Podophryidae Biitschli 



Genus Podophrya Ehrenberg. Subspherical; normally with a rigid 

 stalk; suctorial tentacles in fascicles or distributed on entire body 

 surface; encystment common; fresh or salt water. Many species. 



P. fixa Miiller (Fig. 328, /, g). Spherical; tentacles of various 

 lengths; stalked; nucleus spheroid; one contractile vacuole; 10-28ju 

 long; fresh water. 



P. collini Root. Ovoid; stalked; 30-60 capitate tentacles, dis- 

 tributed; nucleus spherical; one contractile vacuole; 40-50/1 in di- 

 ameter; in swamp. 



P. gracilis Calkins (Fig. 328, h). Small; spherical; long filiform 

 stalk; 1-2 contractile vacuoles; nucleus near attachment of stalk; 

 8/1 in diameter; stalk 40/i long; salt water; Woods Hole. 



P. elongata Wailes (Fig. 328, i). Elongate; flattened; with a pedi- 

 cel; tentacles distributed; nucleus cylindrical; 95-105/i long; stalk 

 65-85/i by 7-9/i; on the marine copepod, Euchaeta japonica; Van- 

 couver. 



Genus Parapodophrya Kahl. Spherical; tentacles radiating, a few 

 long, more or less conical at proximal portion; stalk thin; salt water. 



P. typha K. (Fig. 329, a). 50-60/i in diameter; salt water. 



Genus Sphaerophrya Claparede and Lachmann. Spherical, with- 

 out stalk; with or w^ithout distributed tentacles; multiplication by 

 binary fission or exogenous budding; fresh water, free-living or para- 

 sitic. 



S. soliformis Lauterborn (Fig. 329, b). Spherical; numerous tenta- 

 cles about 1/4-1/3 the body diameter; a contractile vacuole; nu- 

 cleus oval; diameter about lOO/i; sapropelic. 



