HOLOTRICHA 605 



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, 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; contract- 

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



B. bermudense (Biggar) (Fig. 286, d). 90-185m by 48-82m; in Lij- 

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

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

 tus, Centr echinus antillarum, Echinometra lucunter, Tripneustes escu- 

 lentus and Astrophyga magnifica. 



B. echinometris (B.) (Fig. 286, e). 80-195/x by 33-70m; 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 macro nucleus cen- 

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



A. elongata Biggar (Fig. 286, /). About 96m long (Powers); 166m 

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

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

 also in the hosts mentioned for Biggaria bermudense. 



A. aglycus Powers (Fig. 286, g). 56-120m by 16-35m; in the gut of 

 Centrechinus antillarum and Echinometra lucunter; Tortugas. 



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. 287, a). 70-100m by 42-60m. 



P. beckeri Hsiung (Fig. 287, b). 52-98m by 30-52m. 



Family 12 Isotrichidae Biitschli 



Genus Isotricha Stein. Ovoid; flattened; dense longitudinal ciliary 

 rows; cytostome at or near anterior end; several contractile vacuoles; 

 reniform macronucleus and a micronucleus connected with, and 

 suspended by, fibrils, karyophore; locomotion with posterior end 

 directed forward; in the stomach of cattle and sheep. 



