420 PROTOZOOLOGY 



L. sauvageaui D. (Fig. 176, b-e). Fusiform body 7— llyu long; pseu- 

 doplasmodium-formation; amoeboid stage 2.5-14ju long; flagellate 

 stage 7-18/z long; parasitic in Laminaria lejolisii at Roscoff, France. 



Family 2 Pseudosporidae Berlese 



Genus Pseudospora Cienkowski. Body minute; parasitic in algae 

 and Mastigophora (including Volvocidae) ; organism nourishes itself 

 on host protoplasm, grows and multiplies into a number of smaller 

 individuals, by repeated division; the latter biflagellate, seek a new 

 host, and transform themselves into amoeboid stage; encystment 

 common. Morphology and development (Schussnig, 1929). 



P. volvocis C. (Fig. 176, /, g). Heliozoan form about 12-30/1 in 

 diameter; pseudopodia radiating; cysts about 25ju in diameter; in 

 species of Volvox. Morphology (Roskin, 1927). 



P. -parasitica C. Attacks Spirogyra and allied algae. 



P. eudorini Roskin. Heliozoan forms 10-12/x in diameter; radiating 

 pseudopodia 2-3 times longer; amoeboid within host colony; cysts 

 15 n in diameter; in Eudorina elegans. 



Genus Protomonas Cienkowski. Body irregularly rounded with 

 radiating filo podia; food consists of starch grains; division into bi- 

 flagellate organisms which become amoeboid and unite to form 

 pseudo plasmodium; fresh or salt water. 



P. amyli C. (Fig. 176, h-j). In fresh water. 



Family 3 Vampyrellidae Doflein 



Filo podia radiate from all sides or formed from a limited area; 

 flagellate forms do not occur; the organism is able to bore 

 through the cellulose membrane of various algae and feeds on proto- 

 plasmic contents; body often reddish because of the presence of 

 carotin; multinucleate; multiplication in encysted stage into uni- or 

 multi-nucleate bodies; cysts often also reddish. 



Genus Vampyrella Cienkowski. Heliozoa-like; endoplasm vacuo- 

 lated or granulated, with carotin granules; numerous vesicular 

 nuclei and contractile vacuoles; multinucleate cysts, sometimes 

 with stalk; 50-700/* in diameter. Several species. 



V. lateritia (Fresenius) (Fig. 176, k, I). Spherical; orange-red 

 except the hyaline ectoplasm; feeds on Spirogyra and other algae 

 in fresh water. On coming in contact with an alga, it often travels 

 along it and sometimes breaks it at joints, or pierces individual cell 

 and extracts chlorophyll bodies by means of pseudopodia; multipli- 

 cation in encysted condition; 30-40/z in diameter. Behavior (Lloyd, 

 1926, 1929). 



