604 



PROTOZOOLOGY 



about 2/5 the body length from anterior end; without trichocysts; 

 macro nucleus central, with a micro nucleus; contractile vacuole sub- 

 terminal; swimming movement rapid without interruption. Two 

 species. 



E. indomitus M. (Fig. 286, h). 80-1 17^ by 20-23^; in the intestine 

 of Strongylocentrotus droehachiensis. 



Fig. 286. a, Entorhipidium echini, X270 (Lynch); b, Entodiscus in- 

 domitus, X380 (Madsen); c, E. borealis, X380 (Powers); d, Biggaria 

 bermudense, X380 (Powers); e, B. echinometris, X380 (Powers); f, Ano- 

 phrys elongata, X390 (Powers); g, A. aglycus, X390 (Powers). 



E. horealis (Hentschel) (Fig. 286, c). Oval; cytostome nearer an- 

 terior end; 105-170iu by 60-1 15ju; in the gut of Strongylocentrotus 

 droehachiensis and Echinus esculentus; Powers (1933) studied this 

 species in the first-named host from Maine, and found a supporting 



