segments, [258];

head, [263];

swim-bladder, [272];

genital organs, [274];

parasitic, [297]

Hesperodrilus, [352] f., [369], [378] f.

Hesse, on nervous system of Nematoda, [127]

Heterakis, [131], [139]

Heterocotylea, [73]

Heterodera, [155], [160], [164]