EUCILIATA, HOLOTRICHA 496 



Genus Protoradiophrya Rossolimo. Elongate; near anterior 

 end, a shallow depression, along which is found a spicule which 

 may be split posteriorly. A few species. 



P. fissispiculata Cheissin (Fig. 228, /). 180-350^ long; in ante- 

 rior portion of intestine of Styloscolex sp. 



Genus Mrazekiella Kijenskij. Elongate; anterior portion broad 

 with sucker-like depression, posterior region cylindrical; anterior 

 end with attaching organella composed of arrowhead and skeletal 

 ribs; macronucleus an elongate band; contractile vacuoles dis- 

 tributed. A few species. 



M. intermedia Cheissin (Fig. 228, g). 180-260/x long; in anterior 

 portion of intestine of Branchiura coccinea. 



Genus Mesnilella Cepede. Elongate; with one or more long 

 spicules imbedded in endoplasm ; contractile vacuoles in 1-2 rows. 

 Numerous species. 



M. rostrata Rossolimo (Fig. 228, h). 100-1200^ long; in intes- 

 tine of various oligochaetes (Styloscolex, Teleuscolex, Lampro- 

 drilus, Agriodrilus, etc.). 



M. clavata (Leidy) (Fig. 228, i). 100-200^ long; in intestine of 

 Lumbricus variegatus. 



References 



C^PEDE, C. 1910 Recherches sur les Infusoires astomes. Arch. 



zool. exp., Vol. 3 (ser. 5). 

 Cheissin, E. 1930 Morphologie und systematische Studien iiber 



Astomata aus dem Baikalsee. Arch. f. Protistenk., Vol. 70. 

 Heidenreich, E. 1935 Untersuchungen an parasitischen Ci- 



liaten aus Anneliden. I, II. Arch. f. Protistenk. Vol. 84. 



