EUCILIATA, HOLOTRICHA 559 



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. fissispicidata Cheissin (Fig. 266, /). 180-350^ long; in the 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; macro nucleus an elongate band; contractile vacuoles dis- 

 tributed. A few species. 



M. intermedia Cheissin (Fig. 266, g). 180-260^ long; in the 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. 266, h). 100-1200/i long; in the intes- 

 tine of various oligochaetes (Styloscolex, Teleuscolex, Lamprodrilus, 

 Agriodrilus, etc.). 



M. clavata (Leidy) (Fig. 266, i). 100-200^ long; in the intestine of 

 Lumbricus variegatus. 



References 



Beers, C. D. 1938 Structure and division in the astomatous ciliate 



Metaradiophrya asymmetrica n. sp. Jour. E. Mitchell Sci. Soc, 



Vol. 54. 

 Cepede, C. 1910 Recherches sur les Infusoires astomes. Arch. zool. 



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

 Cheissin, E. 1930 Morphologic und systematische Studien iiber 



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

 Heidenreich, E. 1935 Untersuchungen an parasitischen Ciliaten 



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

 MacLennan, R. F. 1944 The pulsatory cycle of the contractile 



canal in the ciliate Haptophrya. Trans. Amer. Micr. Soc, Vol. 



63. 

 Rossolimo, L. L. 1926 Parasitische Infusorien aus dem Baikalsee. 



Arch. f. Protistenk., Vol. 54. 



