Crossopterygii. Crustacea, the. Cryptocoela. Cryptorchism. Crystalline lens, the. development of the. Cutaneous glands. Cuttlefish, embryology of the. Cuvier, G. Cyanophycea. Cyclostoma, the. ova of the. Cyemaria. Cynopitheca. Cynthia. Cytoblastus, the. Cytodes. Cytoplasm. Cytosoma. Cytula, the. Dalton. Darwin, C. Darwin, E. Darwinism. Decidua, the. Deciduata. Deduction, nature of. Degeneration theory, the. Dentition of the ape and man. Depula. Descent of Man. Design in organisms. Deutoplasm. Devonian strata. Diaphragm, the. evolution of the. Dicyema. Dicyemida. Didelphia. Digonopora. Dinosauria. Dipneumones. Dipneusta. ova of the. Dipnoa. Directive bodies. Discoblastic ova. Discoplacenta. Dissatyrus. Dissection, medieval decrees against. Dohrn, Anton. Dollinger. Dorsal furrow, the. shield, the. zone, the. Dromatherium. Dualism. Dubois, Eugen. Ductus Botalli, the. Ductus venosus Arantii. Duodenum, the. Duration of embryonic development. of man's history. Dysteleology. proofs of. Ear, evolution of the. structure of the. uselessness of the external. Ear-bones, the. Earth, age of the. Echidna hystrix. Ectoblast. Ectoderm, the. Edentata. Efficient causes. Egg of the bird. or the chick, priority of the. Elasmobranchs, the. Embryo, human, development of the. Embryology. evolutionary value of. Embryonic development, duration of. disk, the. spot, the. Encephalon, the. Endoblast. Endothelia. Enterocoela. Enteropneusta. Entoderm, the. Eocene strata. Eopitheca. Epiblast. Epidermis, the. Epididymis, the. Epigastrula. Epigenesis. Epiglottis, the. Epiphysis, the. Episoma. Episomites. Epispadia. Epithelia. Epitheria. Epovarium, the. Equilibrium, sense of. Esthonychida. Eustachian tube, the. Eutheria. Eve. Evolution theory, the. inductive nature of. Eye, evolution of the. structure of the. Eyelid, the third. Eyelids, evolution of the. Fabricius ab Aquapendente Face, embryonic development of the. Fat glands in the skin. Feathers, evolution of. Fertilisation. place of. Fin, evolution of the. Final causes. Flagellate cells. Floating bladder, the. evolution of the. Foetal circulation. Food-yelk, the. Foot, evolution of the. of the ape and man. Fore brain, the. Fore kidneys, the. Fossiliferous strata, list of. Fossils. scarcity of. Free will. Friedenthal, experiments of. Frog, the. ova of the. Frontonia. Function and structure. Furcation of ova. Gaertner's duct. Ganglia, commencement of. Ganglionic cell, the. Ganoids. Gastraea, the. formation of the. Gastraea theory, the. Gastraeads. Gastremaria. Gastrocystis, the. Gastrophysema. Gastrotricha. Gastrula, the. Gastrulation. Gegenbaur, Carl. on evolution. on the skull. Gemmation. General Morphology. Genesis. Genital pore, the. Geological evolution, length of. periods. Geology, methods of. rise of. Germ-plasm, theory of.