Protomastigaceae parasitic in, in fever, [119] f.
Blood-corpuscle, entered by Haemosporidae and Acystosporidae, [102] f., [104] f.;
by Treponema and Trypanosoma, [120]
Blood-system, of Asterias rubens, [449] f.;
of Echinus esculentus, [529];
of Holothuria nigra, [567];
of Antedon rosacea, [587]
Bloody rain, [125]
Blowflies, alleged spontaneous generation of, [42]