coelom, [123];

vascular system, [124], [125];

renal organs, [125], [127];

nervous system, [127];

sense-organs, [128];

gonads, [129];

embryology and life-history, [130], [130], [131], [132], [133], [134], [135], [136];

compared with Hemichordata, [11] f., [16], [29] f.

—see also Branchiostoma

Amphipnoidae, [598]