INDEX 



739 



Digestion, in pigeon, 408 



in rabbit, 444 



in snail, 268 



in spider, 223 



in starfish, 291 

 Digestive diverticula, 205, 211, 267, 



276, 305 



organs. See Canal, alimentary- 

 Digitals, 394 



Digitigrade, 418, 489, 557 

 Digits, 418 



Dimorphism of gametes, 5 

 Dinosaurs, 356, 579 

 Dipeptides, 444 

 Diphycercal, 553 

 Diploblastica^ iii, 187 

 Diploid, 694 

 Diplopoda, 222 

 Diplotene stage, 692 

 Diplura, 249 



Dipnoi, 546, 583, 590, 596 

 Diptera, 148, 245, 256 

 Disaccharase, 444 

 Discus proligerus, 540 

 Disc of starfish, 286 



of Vorticella, 56 

 Discs, imaginal, 247 

 Distal, 188 



Distomum hepaticum, 118 

 Division, amitotic, 694 



meiotic, 692 



mitotic, 688 



of Amoeba, 32, 33, 34 



of cells, 692 



of nuclei, 688 



of Paramecium, 51 



reduction, 692 



See also Fission 

 Dobell, C, 78, 79 

 Dog, 455, 557, 558 



skull of, 42s, 579 

 Dogfish, 310, 510, 544, 554 



alimentary system of, 322 



backbone of, 315 



blood vessels of, 325, 326, 329 



brain of, 336 



cranial nerves of, 342 



ductless glands, 344 



excretory organs of, 333 



external features of, 311 



gill arch of, 590 



heart of, 325 



limbs of, 320 



muscles of, 313 



nervous system of, 336 



reproduction, 335 



respiration of, 325 



sense organs of, 339 



Dogfish, skeleton of, 315 



skin of, 313 



skull of, 316 



swimming of, 314 



veins of, 606 



water regulation, 332 

 Dogs, 488 

 Dolphins, 486 

 Dominance, 680, 699 

 Doralis vumicis, 251 

 Dormouse, 485 

 Dorsal lip, 623 



pores, 160 



surface, 188 

 Down, 396 



Dracunculiis medinensis, 144 

 Dragon-flies, 240, 246, 230 

 Drift, 724 

 Drones, 261 

 Drosophila, 688, 696 

 Drugs, effect of, on Paramecium, 



51 

 Duckmole, 4g6, 579 



Duct, 13 



archinephric, 657 



bile, 530 



of dogfish, 324 



of frog, 365 



of man, 481 



of pigeon, 408 



of rabbit, 442 

 carotid, 601 

 ejaculatory, of Ascaris, 138 



of cockroach, 237 



of liver fluke, 122 

 hermaphrodite, 269 

 holonephric, 617 



mesonephric. See Duct, Wolffian 

 metanephric. See Ureter 

 Miillerian, 643, 657 

 pancreatic, of dogfish, 324 



of man, 481 



of pigeon, 408 



of rabbit, 442 

 pronephric, 617, 679 

 segmental, 615, 657 

 thoracic, 526 

 urinary, 334 

 Wolffian, of chick, 657 



of dogfish, 334 



of frog, 378, 379 



of vertebrates, 617, 618, 679 

 Ductless glands. See Glands, duct- 

 less 

 Ductus arteriosus, 449, 601 

 Botalli, 601 

 Cuvieri, 307, 332 

 deferens. See Vas deferens 



