The Origin of Vertebrates

by Walter Holbrook Gaskell

Gymnophiona, [393]

Hæmocytes, [472]

Head of embryo dogfish, [121], [123]

Head-shield, dorsal, of Ammocœtes, [330], [331], [338]

Head-s"ield, dor"al, of Auchenaspis, [29], [31], [338]

Head-s"ield, dor"al, of Cephalaspis, [327], [328], [330], [338], [348]

Head-s"ield, dor"al, of Cyathaspis, [340]

Head-s"ield, dor"al, of Didymaspis, [338]

Head-s"ield, dor"al, of evidence of segmentation, [339]

Head-s"ield, dor"al, of Keraspis, [328]