750 PROTOZOOLOGY 



droebachiensis and Echinus esculentus; Powers (1933) studied this 

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

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

 cavity and which he named stomatostyle. 



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

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

 tudinal rows; longer cilia on caudal prolongation; cytostome in the 

 posterior half, opening into a vestibule, into which long cilia project 

 from the roof ; aperture to cyto pharynx with 2 membranes ; contrac- 

 tile vacuole subterminal; in the intestine of sea-urchins. 



B. bermudense (Biggar) (Fig. 319, d). 90-185/* by 48-82/*; in Ly- 

 techinus variegatus; Bermuda (Biggar), North Carolina (Powers). 

 Powers (1935) found the organism at Tortugas in Lytechinus variega- 

 tus, Centrechinus antillarum, Echinometra lucunter, Tripneustes escu- 

 lentus and Astrophyga magnifica. 



B. echinometris (B.) (Fig. 319, e). 80-195/* by 33-70/*; in Echi- 

 nometris subangularis (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 macro nucleus cen- 

 tral; contractile vacuole terminal; in the intestine of sea-urchins. 



A. elongata Biggar (Fig. 319, /). About 96/t long (Powers); 166m 

 long (Biggar) ; in the gut of Lytechinus variegatus and Echinometris 

 subangularis; Bermuda (Biggar); Powers (1935) found this species 

 also in the hosts mentioned for Biggaria bermudense. 



A. aglycus Powers (Fig. 319, g). 56-120/* by 16-35/*; in the gut of 

 Centrechinus antillarum and Echinometra lucunter; Tortugas (Pow- 

 ers, 1935). 



Family 11 Paraisotrichidae da Cunha 



Genus Paraisotricha Fiorentini. Uniformly ciliated in more or 

 less spiral longitudinal rows; longer cilia at anterior end; cytostome 

 near anterior tip; contractile vacuole posterior; in the caecum and 

 colon of horse. 



P. colpoidea F. (Fig. 320, a). 70-100/* by 42-60/*. Conjugation 

 (Dogiel, 1930). 



P. beckeri Hsiung (Fig. 320, b). 52-98/* by 30-52/* (Hsiung, 1930, 

 1930a\ 



