Jaekel, on Silurian Asteroidea and Ophiuroidea, [501];
on classification of Crinoidea, [589], [595];
on classification of Cystoidea, [598]
James-Clark, on Protozoa, [46];
on Choanoflagellates, [121], [123];
on Sponges, [167]
Jaw, of Ophiothrix fragilis, [482];
of fossil Ophiuroidea, [502];
of Echinus esculentus, [526]
Jelly, forming theca in Flagellates, [113]