Four new rumen ciliates, Entodinium ogimotoi sp. n., E. bubalum sp. n., E. fujitai sp. n. and E. tsunodai sp. n. and Oligoisotricha bubali (Dogiel, 1928) n. comb. Japanese Journal of Veterinary Science, 43(2) 1981: 201-209. 204 [Zoological Record Volume 118]