Parasitology is a major and critically important healthcare field in present world because 15 million children in the wrld will die each year from a combination of malnutrition and infectious diseases which includes 4.5 billion helminth infections. So a great deal of research work is required in this particular field to prevent these many children from death. The presentation of the material in this book is based on the observations in the field of parasitology. It is designed to be concise reference work from which the users may quickly retrieve factual material as an aid in the identification and control of Helminths of medical importance. Such type of researchs could be helpful in developing an interest in the students and researchers of medical science to pursue their research work for the benifits of humanity and humankind.