696 PROTOZOOLOGY 



vascular cavity of various fresh- and salt-water turbellarians, most 

 frequently Planaria torva. 



Family 4 Intoshellinidae Cepede 



Genus Intoshellina Cepede. Elongate; ciliary rows slightly spiral; 

 macronucleus voluminous, highly elongate; 5-7 contractile vacuoles 

 scattered in posterior region; a complicated attaching organella at 

 anterior end (Fig. 297, i) ; vestigial cytopharynx. 



/. poljanskyi Cheissin (Fig. 297, h, i). 170-280/x long; in the intes- 

 tine of Limnodrilus arenarius. 



Genus Monodontophrya Vejdowsky. Elongate; anterior end with 

 thick ectoplasm; attaching organella at anterior end, with fibrils; 

 macronucleus elongate; numerous contractile vacuoles in a longi- 

 tudinal row. 



M. kijenskiji Cheissin (Fig. 297, j, k). 400-800^ long; in anterior 

 portion of intestine of Tubifex inflatus. 



Genus Maupasella Cepede. Ellipsoid; close longitudinal ciliary 

 rows; with a spinous attaching organella at anterior end, with fibrils; 

 contractile vacuoles in 2 irregular rows; macronucleus elongate. 

 One species. 



M. nova C. (Fig. 298, a). 70-130^ long; in the intestine of Allolobo- 

 phora caliginosa (annelid). Supplementary chromatic body (Keilin, 

 1920). 



Genus Schultzellina Cepede. Similar to Maupasella; but with at- 

 taching organella set obliquely; macronucleus voluminous, reniform. 



S. mucronata C. (Fig. 298, b). In the intestine of Allurus tetraedurus 

 (annelid). 



Genus Hoplitophrya Stein. Slender, elongate; elongated macro- 

 nucleus; a micronucleus; a single longitudinal row of many contrac- 

 tile vacuoles on the dorsal side; a single median spicule with a small 

 pointed tooth at its anterior end; in the intestine of oligochaetes. 

 Several species. 



H. secansS. Elongated; 160-500/; by 20-35/x; 15-30 contractile 

 vacuoles in a row; spicule 10-15/x long; in the intestine of Lumbricus 

 variegatus. 



H. criodrili Miyashita (Fig. 298, c). Ellipsoid, slightly flattened; 

 90-130/x by 45-60^; periphery of endoplasm highly granulated; at- 

 taching organelle about 25/x long; macronucleus bandform; two rows 

 of contractile vacuoles; in the anterior half of the gut of an oligo- 

 chaete, Criodrilus sp. 



Genus Radiophrya Rossolimo. Elongate, often with satellites; 

 attaching organella composed of an arrowhead, a tooth and ecto- 



