EUCILIATA, HOLOTRICHA 493 



pression without encircling cilia, but with 2 chitinous hooks. One 

 species. 



S. uncinata (Schultze). Up to 200/x long; in gastro-vascular 

 cavity of Planaria ulvae, Gunda segmentata and Proceros sp. 



Genus Lachmannella Cepede. With a chitinous hook at ante- 

 rior end; elongate pyriform, anterior end curved; ciliation longi- 

 tudinal and dense. One species. 



L. recurva (Claparede et Lachmann) (Fig. 227, /). In gastro- 

 vascular cavity of Planaria limacina; about 200^ long. 



Genus Sieboldiellina Collin (Discophrya Stein). Vermiform, 

 with neck-like constriction; simple sucker at anterior end. One 

 species. 



S. planariarum (Siebold) (Fig. 227, g). Up to 700/x long; in gas- 

 tro-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. 227, i); vestigial cytopharynx. 



/. poljanskyi Cheissin (Fig. 227, h, i). 170-280/x long; in intes- 

 tine of Limnodrilus arenarius. 



Genus Monodontophrya Vejdowsky. Elongate; anterior end 

 with thick ectoplasm; attaching organella at anterior end, with 

 fibrils; macronucleus elongate; contractile vacuoles, numerous in 

 a longitudinal row. 



M. kijenskiji Cheissin (Fig. 227, j, k). 400-800^ long; in ante- 

 rior portion of intestine of Tuhifex 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. 228, a). 70-130/i long; in intestine of Alloloho- 

 phora caliginosa (annelid). 



Genus Schultzellina Cepede. Similar to Maupasella; but with 

 attaching organella set obliquely; macronucleus voluminous, reni- 

 form. 



S. mucronaia C. (Fig. 228, 6). In intestine of Allurus tetraedurus 

 (annelid). 



