Gardiner, on development of Acoela, [44] n.
Gasterostomatidae, [73]
Gasterostomum, [73];
G. fimbriatum, life-history, [72];
G. gracilescens, [72]
Gastrocotyle, [73]
Gastrodiscus, [73]
Gastrothylax, [73]
Gastrotricha, [231] f.
Gegenbaur, on Nemertine development, [99]