EUCILIATA, HOLOTRICHA 555 



where there is a depression for fixation of body, with longitudinal 

 myonemes; macro nucleus globular; without contractile vacuole. One 

 species. 



C. hepatica P. 16-26m long; intracellular parasite of the liver of the 

 mollusc, Sphaerium corneum. 



Genus Protophrya Kofoid {Isselina Cepede). Ellipsoid to pyriform; 

 spheroidal macronucleus; contractile vacuole terminal. 2 species. 



P. ovicola K. (Fig. 264, I, m). About 60m long; in the uterus of the 

 mollusc, Littorina rudis. 



Genus Protanoplophrya Miyashita. Similar to Anoplophrya; but 

 with rudimentar}^ oral apparatus, a long slit, an undulating mem- 

 brane and cytopharynx in anterior region of body; macronucleus 

 elongate band; numerous contractile vacuoles. One species. 



P. stomata Miyashita (Fig. 265, a). Cylindrical; up to 1.5 mm. by 

 about 70m; in hind-gut of Viviparus japonicus and V. malleatus. 



Family 2 Opalinopsidae Hartog 



Genus Opalinopsis Foettinger. Oval or ellipsoid; macronucleus 

 fragmented; ciliation uniform and close; parasite in the liver of 

 cephalopods. A few species. 



0. septolae F. (Fig. 265, b). 40-80/x long; in the liver of Sepiola ron- 

 deletii and Octopus tetracirrhus. 



Genus Chromidina Gonder {Benedenia Foettinger). Elongate; 

 anterior region broader, ends pointed; uniform ciliation; macro- 

 nucleus in irregular network distributed throughout body; micro- 

 nucleus obscure; budding and encystment; Cheissin holds that this 

 is identical with Opalinopsis. One species. 



C. elegans (Foettinger) (Fig. 265, c, d). 500-1 500/x by about 30-60^ 

 in kidney and gonad of cephalopods: Sepia elegans, Loligo sp., etc. 



Family 3 Haptophryidae Cepede 



Genus Haptophrya Stein. Elongate; uniformly ciliated; anterior 

 end with a neck-like constriction; a circular sucker surrounded by 

 1-2 rows of cilia. A few species. 



H. michiganensis Woodhead (Fig. 265, e). 1.1-1.6 mm. long; in the 

 gut of the four-toed salamander, Hemidactylium scutatum; Michigan. 

 MacLennan (1944) made a careful study of its contractile canal 

 (p. 76). 



H. virginiensis Mej^er. 354^ by 95m; macronucleus about one- 

 third of the body length ; in the intestine of Rana palustris. 



Genus Steinella Cepede. Anterior end broad; sucker-like depres- 

 sion without encircling cilia, but with 2 chitinous hooks. One species. 



