HOLOTRICHA 543 



tractile vacuole siibterminal; swimming movement rapid without 

 interruption. Two species. 



E. indomitus M. (Fig. 248, h). 80-117^ by 20-23^; in intestine 

 of Strongylocentrotus droehachiensis. 



E. horealis (Hentschel) (Fig. 248, c). Oval; cytostome nearer 

 anterior end; 105-170ju by 60-1 15^; in gut of Strongylocentrotus 

 droehachiensis and Echinus esculentus; Powers (1933) studied this 

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

 ing rod which is imbedded in the margin along the right wall of 

 the oral cavity and which he named stomato style. 



Genus Biggaria Kahl. Scoop-like form; anterior 2/3 thin, pos- 

 terior region thickened, terminating in a rudder-like style; cilia 

 in longitudinal rows; longer cilia on caudal prolongation; cyto- 

 stome in posterior half, opening into a vestibule, into which long 

 cilia project from the roof; aperture to cytopharynx with 2 

 membranes; contractile vacuole subterminal; in the intestine of 

 sea-urchins. 



B. hermudense (Biggar) (Fig. 248, d). 90-185^ by 48-82ju; in 

 Lytechinus variegatus; Bermuda (Biggar), North Carolina 

 (Powers); Powers (1935) found the organism further at Tortugas 

 in Lytechinus variegatus, Centrechinus antillarum, Echinometra 

 lucunter, Tripneustes esculentus and Astrophyga magnifica. 



B. echinometris (B.) (Fig. 248, e). 80-195^ by 33-70ai; in Echi- 

 nometris suhangularis (Bermuda) .and Lytechinus variegatus 

 (North Carolina). 



Genus Anophrys Cohn. Cigar-shaped; flexible; longitudinal 

 ciliary rows; peristome begins near the anterior end, parallel to 

 body axis and about 1/3 the body length; a row of free cilia on 

 right edge of peristome; cytostome inconspicuous; spherical 

 macronucleus central; contractile vacuole terminal; in sea- 

 urchins. 



A. elongata Biggar (Fig. 248,/). About 96m long (Powers); 166/x 

 long (Biggar); in gut of Lytechinus variegatus and Echino- 

 metris suhangularis ; Bermuda (Biggar); Powers (1935) found this 

 species also in the hosts mentioned for Biggaria hermudense. 



A. aglycus Powers (Fig. 248, g). 56-120^ by 16-35/z; in gut of 

 Centrechinus antillarum and Echinometra lucunter; Tortugas. 



Family 11 Paraisotrichidae da Cunha 

 Genus Paraisotricha Fiorentini. Uniformly ciliated in more or 



