of Sponges, [234] f.;

of nervous system of Echinoidea, [519] f.

Physonectidae, [301], [307]

Physophora, [301], [308];

P. borealis, [304]

Physophorae, [307]

Physophorinae, [308]

Pigment, of Stentor, [154];

of Sponges, [169], [238];

-granules, of Phaeodaria, [76], [80] f.