Interambulacral plate, of Echinus esculentus, [511];
of Cidaridae, [533] f.;
of Echinarachnius parma, [544] f.
Interbrachial septa—see Interradial septa
Interchanges between cell and medium, [14]
Intermediate dorsal process of ciliated band of Auricularia, [608]
Intermediate (= supplemental) skeleton of Perforate Foraminiferal shell, [63], [66]
Intermittent fever, malarial, produced by Acystosporidae, [103] f.
Internal budding of Suctoria, [160] f., [162];
of Ephydatia, [177]