756 INDEX. 
Dorsal vessel, rate of pulsation in, 
654, 655 
relations of, 639 
relations of, to pericardial sep- 
tum, 643 
valves of, 638, 641 
valves, action of, 652 
Dorsal vessel of larva, 87 
structure of, 91 
ventricle of, 87 
Dorsal vessel of nymph, 340 
changes during development, 
341 
morphology of, 92 
Dorso-pleural costa, 175 
Dorso-pleural diarthrosis, 176 
Dorso-pleural suture, 167 
Dragon-fly. See Libellula 
Dufour, aérostats of, 217 
on inter-segmental 
sey 
Dujardin on corpora fungiformia, 
spiracles, 
461 
Duponchel on hygroscopic function 
of antenna, 594 
Duration of larval stage, 2 
of pupa stage, 3 
Dytiscus, experiments on nervous 
system of, 476 
EARWIG. See Forficula 
Eau de Javelle, 349 
de Labarraque, 349 
Ecdysis, 17 
of larva, 2 
relation to metamorphosis, 23 
of tracheal intima, 307, 339, 356 
Echinodermata, development of em- 
bryo in, 230, 231 
metamorphosis of, 24 
Eciton, eyes of, 516 
Egg, development in, 230 
development of, 701 
bibliography of, 678 
deposition of, 5 
fecundation of, 1 
form of, 678 
of Birds and Insects compared, 
a2 
position of embryo in, 678 
size of, 678 
Egg-cell, 701 
Egg-stocks, 699 
Egg-tubes, 667 
Ehrlich’s Haematoxylin solution, 96 
Eingesprengte zellen, 274 
Ejaculatory duct, 665 
Ejaculatory sac, 665 
Ellipsoidal body, 458 
Embryo, 13, 230 
lepidopterous, 241 
number of segments in, 15 
nymphoid stage of, 257 
position of, in egg, 678 
preparation of, 347 
retrograde development of, 2 
Embryology, 12, 230 
bibliography, 230, 235 
Embryonic cells in salivary gland, 60 
Embryonic epithelium, 278 
Embryonic membranes, 241 
Embryonic rudiments, nomenclature 
of, 22 
Emery on proventriculus, 409 
Empis, anterior legs of, 191 
Enchylema, 264 
End-organs, motor, 289 
of proboscis, 402 
End-plates. See End-organs 
Endogenous cell division, 693, 696, 
719 
Endolecithal, 245 
Endopophysis, 106 
Endosclerites, 105 
Endoskeleton, 9 
Endosternum. See Entosternum 
Endostracum, 9, 10, 36 
Endothelioid cells, 85 
Endothelium, 273 
Entocephalon, 123 
of Syrphus, 124 
of Volucella, 124 
Entoconcha, germinal vesicle of, 711 
Entopleuron, great, 172 
Entosternum, 106 
development of, in Hydrophilus, 
481 
Entothorax, 172 
Eosin, use of, 348 
Epaulet, 200 
Ephemera, genital ducts of, 735 
tracheal gills of, 180 
tracheal system of, 355 
Epiblast, 13 
delamination of the, 484 
Epicondyle, 179 
Epicosta, 182 
