Smithsonian Institution, United States National Museum, Bulletin 66

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. It is Of great importance for interested students throughout the world to make themselves known to each other, in order that' together they may hasten the understanding Of these parasites, and also that in future publications the scattered notes, published and unpublished, from all lands may be brought together to form a more complete knowledge Of their biology and structure.