366 



THE CILIATES 



Dogiel (1929) because the latter is a hom- 

 onym of the names previously given to a 

 foraminiferan and a lepidopteran (Corliss, 

 1960). 



Polymorphella ampulla (Dogiel, 1929) 

 Corliss, 1960 measures 22 to 36 by 13 to 

 21 ^t . Hsiung (1930) found it in the cecum 

 of 3 and the colon of 1 out of 46 horses in 

 Iowa. 



Genus PRORODONOPSIS 

 Gassovsky, 1919 



The body is piriform and uniformly 

 ciliated. The macronucleus is sausage- 

 shaped. There are 3 contractile vacuoles. 



Prorodo)iopsis co// Gassovsky, 1919 

 measures 55 to 67 by 38 to 45jLt. Hsiung 

 (1930) did not find it in Iowa horses. 



Genus SUICOARCUS Hsiung, 1935 



or stalk. The macronucleus is ovoid or 

 spherical, and the micronucleus is com- 

 pact. There is 1 contractile vacuole. The 

 cytoplasm is often filled with small spher- 

 oidal bodies. 



Allantosoma intestinalis Gassovsky, 

 1919 has a sausage-shaped body with 3 to 

 12 tentacles at each end bearing distinct 

 suckers. It measures 33 to 60 by 18 to 

 37 /i. The cytoplasm is filled with small, 

 round bodies. The macronucleus is more 

 or less spherical. Hsiung (1930) found 

 this species in the cecum of 6 and the colon 

 of 8 out of 46 horses in Iowa. 



A. dicorniger Hsiung, 1928 has a more 

 or less cycloid body with 1 incurved tenta- 

 cle at each end, and measures 20 to 33 by 

 10to20jLt. The end of the tentacle is 

 somewhat boot-shaped. The cytoplasm is 

 filled with granules. The macronucleus is 

 subspherical. Hsiung (1930) found this 

 species in the colon of 2 out of 46 horses 

 in Iowa. 



The body is ovoid, compressed, with 

 a short spiral groove at the anterior end. 

 The cytostome is at the end of the groove. 

 The cytopyge is terminal. The concretion 

 vacuole is mid-ventral, with the contrac- 

 tile vacuole posterior to it. Cilia are 

 present on the groove, mid-ventral region 

 and posterior end. 



Sulcoarcus pellucidiibis Hsiung, 1935 

 measures 33 to 56 by 30 to 40 fx. Hsiung 

 (1935) found it in the feces of the mule in 

 China. 



FAMILY ACINETIDAE 



In this holotrichasin, suctoriorid 

 family the tentacles are capitate and are 

 usually arranged in groups. Endogenous 

 budding occurs. A lorica is often present, 

 and a stalk is present or absent. 



Genus ALLANTOSOMA 

 Gassovsky, 1919 



The body is elongate, with 1 or more 

 tentacles at each end, but without lorica 



A. brevicorniger Hsiung, 1928 has an 

 elongate, cycloid body with 1 short, slen- 

 der slightly incurved tentacle at each end. 

 It measures 23 to 36 by 7 to 11 ji. The 

 distal end of the tentacle is rounded. The 

 cytoplasm is slightly granular. Hsiung 

 (1930) found this species in the cecum of 9 

 out of 46 horses in Iowa. 



FAMILY BLEPHAROCORYTHIDAE 



In this holotrichasin, trichostomorid 

 family, somatic ciliation is reduced to a 

 few anterior and posterior fields, with 1 or 

 2 groups of anal cilia near the cytopyge 

 and 2 or 3 distinct anterior groups. The 

 cytostome is anteroventral, and opens into 

 a long, ciliated cytopharynx. 



Genus BLEPHAROCORYS 

 Bundle, 1895 



There are 3 (oral, dorsal and ventral) 

 ciliary zones at the anterior end and 1 

 caudal ciliary zone. There is a deep oral 

 groove near the anterior end. 



