THE CILIATES 



367 



Blepharocorys uncinata (Fiorentini, 

 1890) Bundle, 1895 is elongated and ir- 

 regular in shape, with a slightly convex 

 dorsal side, a slightly concave ventral 

 side and more or less rounded ends; it 

 measures 55 to 74 by 22 to 30 jj,. A cork- 

 screw-like anterior process which makes 

 2 turns projects from the anterior end and 

 also passes thru the body dorsal to the 

 cytopharynx, ending just behind it. There 

 is a large, ciliated vestibule at the anter- 

 ior end which leads to a cytostome opening 

 into a ciliated cytopharynx which extends 

 dorso-posteriad and then bends sharply 

 ventrad and disappears at the posterior 

 half of the body. The macronucleus is 

 heart-shaped. There is a single posterior 

 contractile vacuole. Hsiung (1930) found 

 this species in the cecum of 21 and the 

 colon of 4 out of 46 horses in Iowa. 



B. valvata (Fiorentini, 1890) Bundle, 

 1895 is more or less elliptical and flat- 

 tened bilaterally. It measures 52 to 68 by 

 20 to 27jLi. The vestibule is small and 

 has a beak-like dorsal plate. The macro- 

 nucleus is more or less kidney- shaped. 

 Hsiung (1930) found this species in the 

 cecum of 1 and the colon of 4 out of 46 

 horses in Iowa. 



B. jubata Bundle, 1895 resembles 

 B. valvata, but the dorsal plate guarding 

 the vestibule has 2 teeth. It measures 33 

 to 60 by 17 to 23 |i . The C3d;opharynx ex- 

 tends backward and upward and then again 

 turns backward. The macronucleus is 

 more or less ovoid. Hsiung (1930) found 

 this species in the cecum of 22 and the 

 colon of 4 out of 46 horses in Iowa. 



B. curvigula Gassovsky, 1919 also 

 resembles B. valvata, but its dorsal plate 

 is more or less rhomboid. The long cyto- 

 pharynx extends backward and upward, 

 and finally bends in a smooth, 180° curve. 

 The macronucleus is more or less ovoid. 

 Hsiung (1930) found this species in the 

 colon of 12 out of 46 horses in Iowa. 



B. angiista Gassovsky, 1919 resembles 

 B. valvata, but is more elongate, meas- 

 uring 58 to 78 by 20 to 25 )j, . The dorsal 

 plate is more or less rhomboid. The ma- 

 cronucleus is irregular. Hsiung (1930) 



found this species in the colon of 8 out of 

 46 horses in Iowa. 



B. cardionucleata Hsiung, 1930 re- 

 sembles B. curvigula, but its macronu- 

 cleus is heart-shaped, with an anterior 

 base and a posterior apex. It measures 

 48 to 62 by 17 to 23 fi. Hsiung (1930) 

 found it in the colon of 1 out of 46 horses 

 in Iowa. 



Genus CHARONINA Strand, 1928 



There are 2 caudal and 3 anterior 

 ciliary zones, and an anterior knob is 

 present on the body. This genus was or- 

 iginally named Charon by Jameson (1925), 

 but this name is a homonym (Corliss, 

 1960). 



Cliaronina equi (Hsiung, 1930) Strand, 

 1928 is lanceolate and measures 30 to 48 

 by 10 to 14 fi. The cytostome occupies 

 nearly the whole ventral side of the anter- 

 ior knob and leads to a prominent cyto- 

 pharynx which extends straight down to 

 the middle third of the body. The macro- 

 nucleus is large and elongate. Hsiung 

 (1930) found this species in the colon of 3 

 out of 46 horses in Iowa. 



Genus OCHOTERENAIA 

 Chavarria, 1933 



There are 3 ciliary zones at the an- 

 terior end and 2 at the posterior end. One 

 of the latter is borne on a caudal appendage 

 which arises ventral to the cytopyge. There 

 is a beak-like dorsal plate like that of 

 Blepharocorys. 



Ochoterenaia appendiculata Chavarria, 

 1933 is more or less elliptical and is flat- 

 tened bilaterally. It measures 58 to 72 by 

 24 to 33 jn with a mean of 66 by 28 ^ . The 

 vestibule is prominent. The macronucleus 

 is more or less kidney-shaped. Chavarria 

 (1933a) found this species in the rectum of 

 horses in Mexico. 



