SARCODINA, PROTEOMYXA 



419 



18/x by 4/x and which multiply by binary fission; many cells encyst 

 together within a tough, opaque membrane. The growth is best at 

 14-24°C. and at 12-22 per cent chlorinity (Young). Watson and 

 Ordal (1951) cultivated the organism on agar and sea water with 

 various bacteria, and found that the organism is fusiform in young- 

 cultures; highly motile; filamentous projections are formed from the 

 flat mucoid lamellae, secreted by the organism, and expand to form 

 passways over which the organism travels; holozoic, saprozoic. 



Genus Labyrinthomyxa Duboscq. Body fusiform; amoeboid and 

 flagellate phases, variable in size; flagellate stage penetrates the host 

 cell membrane; in plants. 



Fig. 176. a, Labyrinthula cienkowskii, X200 (Doflein); b-e, Laby- 

 rinthomyxa sauvageaui (b, c, flagellate forms, XlOO; d, e, amoeboid 

 forms, X500) (Duboscq); f, g, Pseudospora volvocis, X670 (Robert- 

 son); h-j, Protonwnas amyli (Zopf);k, 1, Vampyrella lateritia, X530 

 (k (Leidy), 1 (Doflein)); m, n, Nuclearia delicatula, X300 (Cash). 



