Bruce, Col. and Mrs., on Trypanosomic fever and sleeping sickness, [120]
Bubbles of carbon dioxide formed in Arcella, etc., [53]
Buccal sinus of Holothuria nigra, [566]
Buccal tentacle—see Buccal tube-foot
Buccal tube-foot (and tentacle), of Ophiothrix fragilis, [486];
of Echinus esculentus, [518];
of Echinocardium cordatum, [551], [561];
of Holothuria nigra, [561];
of Spatangoidea, [577];
development of, in Holothuroid pupa, [615]