This is an OCR edition without illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from GeneralBooksClub.com. You can also preview excerpts from the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Volume: 4, no. 1; Original Published by: University of Illinois in 1917 in 152 pages; Subjects: Trematoda; Nature / General; Nature / Birds & Birdwatching; Nature / Essays; Nature / Reference; Nature / Wildlife; Science / Life Sciences / Zoology / General; Science / Life Sciences / Zoology / Invertebrates;