EUCILIATA, HOLOTRICHA 491 



B, chaetogastri Penard. Elongate lanceolate, slightly flattened; 

 longitudinal rows of long cilia; cytoplasm colorless; macronucleus 

 elongate; micronucleus voluminous, vesicular; without contrac- 

 tile vacuole; 60-120/4 long; in the oesophagus of Chaetogaster sp. 



Genus Cepedella Poyarkoff. Pyriform with pointed anterior 

 end, where there is a depression apparently used for fixation of 

 body, from which longitudinal myonemes arise; macronucleus 

 globular; without contractile vacuole. One species. 



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

 cyclad mollusc, Sphaerium corneum. 



Genus Protophrya Kofoid (Isselina Cepede). ElHpsoid to pyri- 

 form; spheroidal macronucleus; contractile vacuole terminal. 2 

 species. 



P. ovicola K. (Fig. 226, Z, w). About 60At long; in uterus of the 

 mollusc, Littqrina rudis. 



Genus Protanoplophrya Miyashita. Similar to Anoplophrya ; 

 but with rudimentary oral apparatus, a long sht, an undulating 

 membrane and cytopharynx in anterior region of body; macro- 

 nucleus elongate band; numerous contractile vacuoles. One spe- 

 cies. 



P. stomata Miyashita (Fig. 227, a). Cylindrical; up to 1.5 mm. 

 by about 70/^; in hind-gut of Viviparus japonicus and V. mallea- 



Family 2 Opalinopsidae Hartog 



Genus Opalinopsis Foettinger. Oval or ellipsoid; macronucleus 

 fragmented; ciliation uniform and close; parasite in liver of cepha- 

 lopods. A few species. 



0. sepiolae F. (Fig. 227, h). 40-80/x long; in Hver 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 wdth Opalinopsis. One species. 



C. elegans (Foettinger) (Fig. 227, c, d). 500-1500^ by about 30- 



60/i; in kidney and gonad of cej^halopods : Sepia elegans, Loligo 



SD etc 



' Family 3 Haptophryidae Cepede 



Genus Haptophrya Stein. Elongate; uniformly ciliated; an- 

 terior end with a neck-hke constriction; a circular sucker sur- 

 rounded by 1-2 rows of cilia. A few species. 



