032 PROTOZOOLOGY 



Family 2 Ophryodendridae Stein 



Genus Ophryodendron Claparede et Lachmann. With one long 

 or 3-6 shorter retractile processes, bearing suctorial tentacles; 

 on Crustacea, Annelida, etc.; salt water. Several species. 



0. porcellanum Kent (Fig. 286, c). 60-100/1 long; on Porcellana 

 platycheles, etc. 



0. helgicum Fraipont (Fig. 286, d). 38-1 14/x long; vermicular 

 form lOOfx; on Bryozoa and hydrozoans; Vancouver (Wailes). 



Family 3 Dendrocometidae Stein 



Genus Dendrocometes Stein. Body rounded; with variable 

 number of branched arms; fresh water. 



D. paradoxus S. (Fig. 286, e). Up to 100/x long; on gills of 

 Gammarus pulex, G. puteanus, etc. 



Genus Stylocometes Stein. Arms not branched; tentacles 

 finger-like; fresh water. 



S. digitatus (Claparede et Lachmann). Up to 110^ long; on 

 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 Mliller (Fig. 286, /, g). Spherical; tentacles of various 

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

 28fx long; fresh water. 



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

 tributed; nucleus pherical; one contractile vacuole; 40-50/i in 

 diameter; in swamp. 



P. gracilis Calkins (Fig. 286, h). Small; spherical; long filiform 

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

 stalk; Sn in diameter; stalk 40/x long; salt water; Woods Hole. 



P. elongata Wailes (Fig. 286, i). Elongate; flattened; with a 

 pedicel; tentacles distributed; nucleus cylindrical; 95-105/u 

 long; stalk 65-85;u by 7-9fx; on the marine copepod, Euchaeta 

 japonica; Vancouver. 



Genus Parapodophrya Kahl. Spherical; tentacles radiating, a 

 few long, more or less conical at proximal portion; stalk thin; 

 salt water. 



