London: Taylor And Francis, 1936. First Edition. Hardcover. Two volumes; Octavo; pp; I; xxxvi, 408, index; II; xxviii, 274,(vi) index, ads; Two folding maps, numerous text illustrations; pebbled red cloth lettered in gilt;. Spine of volume I a bit darker than the other, else very good. Item #17231
The nematodes or roundworms constitute the phylum Nematoda. They are a diverse animal phylum inhabiting a very broad range of environments. Nematode species can be difficult to distinguish, and although over 25,000 have been described, of which more than half are parasitic, the total number of nematode species has been estimated to be about 1 million. Unlike the phyla Cnidarians and Platyhelminthes (flatworms), nematodes have tubular digestive systems with openings at both ends. This set belonged to Dr. Robert E. Ogren, scientist, academic and author.