Branchial septa, of Hemichordata, [12];

of Amphioxus, [120]

Branchiostoma, [137], [112], [138];

distribution, [138];

B. belcheri, [137], [138];

B. californiense, [137];

B. capense, [137];

B. caribbaeum, [137];

B. elongatum, [137], [138];

B. indicum, [137];