Development, parallel, [497]

Devel"pment, of two types of eye, [73]

Devel"pment, vertebrate retina, [101]

Diaphragms, [161], [167]

Didymaspis, [327], [338]

Digestion, [441]

Dinosaurs, [17]

Dipnoans, [23], [45], [148]

Diptera, [89], [369]

Diverticula, optic, [102]