SUCTORIA 867 



face; macronucleus ellipsoid; micro nucleus small; 2-3 contractile 

 vacuoles; salt or brackish water. Several species. 



R. trimorpha C. and C. (Fig. 368, a). Up to 150^ long; on the cope- 

 pod, Cletodes longicaudatus. 



Genus Staurophrya Zacharias. Rounded body drawn out into 6 

 processes. 



S. elegans Z. (Fig. 368, 6). Tentacles not capitate; macronucleus 

 round; 1-2 contractile vacuoles; about 50/z in diameter; in fresh 

 water. 



Swarczewsky (1928) established the following genera for the 

 forms he had found in Lake Baikal: Baikalophrya, Stylophrya, 

 Baikalodendron and Gorgonosoma. 



Family 2 Ophryodendridae Stein 



Genus Ophryodendron Claparede and 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. 368, c). 60-IOGVj long; on Porcellana 

 platycheles, etc. 



0. belgicum Fraipont (Fig. 368, d). 38-1 14/z long; vermicular form 

 100/i; on Bryozoa and hydrozoans; Vancouver (Wailes). 



Family 3 Dendrocometidae Stein 



Genus Dendrocometes Stein. Body rounded; with variable num- 

 ber of branched arms; fresh water. Taxonomy (Swarczewsky, 1928a). 



D. paradoxus S. (Fig. 368, e). Up to 100/z long; on Gammarus 

 pulex, G. puteanus, etc. Morphology and biology (Pestel, 1932). 



Genus Stylocometes Stein. Arms not branched; tentacles finger- 

 like ; fresh water. 



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

 gills of Asellus aquaticus and on Aphrydium versatile. 



Genus Dendrocometides Swarczewsky. Body more or less arched; 

 suctorial tentacles slender, pointed and simple or branched; at- 

 tached to crustaceans on its broad and circular surface (Swarczew- 

 sky, 1928a). 



D. priscus S. (Fig. 368, /). Diameter 60-65m, height 18-20/z; on 

 Acanthogammarus albus; Lake Baikal. 



Genus Discosoma S. Discoid; circular in front view; short and 

 pointed tentacles radially arranged, four or six in each row; gemma- 

 tion, endogenous and simple. 



D. tenella S. (Fig. 368, g). Diameter 75/*, height 10/z; on Acantho- 

 gammarus victorii, etc.; Lake Baikal. 



