Revision of Allocreadloidea Nicoll, 1934. Part I. Families: Lepocreadiidae Nicoli, 1934, Deropristiidae n. fam., Homalometridae a. fam. and Maseniidae Gupta, 1953. Proceedings of the National Academy of Sciences of India, 32B 1962: 1-22. 13 [Zoological Record Volume 102]