824 



Hypopharynx, 641 

 Hypostome, of Obttio, 129* 

 Hypotrichous, 92*, 94 



cHNEUMONS, 636, 6 



Ichthyophthirius, 102 



Idmonea, 347 



Idotea, 568 



Illoricata, 328* 



Imaginal discs, 651 



Imago, 649 



Impregnation, 19*, 20 



Impregnation, hypodermic, 309 



Inarticulata, 366*, 367, 368, 369 



In-current canals, of Sponges, 107, 108*, 

 109, 117 



Incus (of Rotifera), 325 



Individual differences, in Nereis dnmerilii, 

 449 



Individual of the first order, 168* 



Individual of the second order, 168* 



Individual of the third order, 168* 



Individual variations, 2*, 113 



Individuation, in Hydrozoa, 167 



Inequilateral, 699* 



Inermia, 496*, 497, 498, 499, 502 



Infundibula, of Aiirelia, 173* 



Infundibular canal, 213* 



Infusoria, 46* : Example, 88 : Classifica- 

 tion, 91 : Systematic position of 

 example, 91 



Infusoriform embryos, of Dicyemida-, 

 230, 231* 



Inhalant pores, 106, 117 



Inhalant siphon, 681 



Ink-sac, of Sepia, 765 



Insecta, 526, 619*, 677, 678: Example, 

 619 : Distinctive characters and classi- 

 fication, 631 : Systematic position of 

 the example, 636 : General organisa- 

 tion, 636: Exoskeleton, 636: Head, 

 637 : Thorax, 637 : Abdomen, 637 : 

 Appendages of head, 637, 638, 639 : 

 Appendages of thorax, 639 : Abdomen, 

 640 : Hfemocoele, 640 : Fat body, 640 : 

 Digestive system, 640, 641 : Malpighian 

 tubes, 64f : Tracheal system, 642 : 

 Blood -vascular system, 642 : Nervous 

 system, 643, 644 ; Organs of special 

 sense, 644, 645 : Luminous organs. 

 645 ; Production of sounds, 645 : Re- 

 productive organs, 646 : Eggs, 647 : 

 Development, 648, 649, 650 : Meta- 

 morphosis, 649 : Mode of life, 651 : 

 Distribution in time, 652 



Integripalliata, 696* 



Integripalliate, 699* 



Integument See Body- wall 



[nter-filamentar junctions, 686 



Inter- lamellar junctions, 686 



Inter-mesenteric chambers, 187* 



Internodes, of Siphonophora, 161 



Inter-radius, 138, 139* 



Interstitial cells, of Obelia, 132 



Intertentacular tube, 352 



Intestinal caeca, 383, 388 



Introvert, of Polyzoa, 341 : Sipuncutu*, 



493 : Gephyrea, 496 : Triton, 724 : 



Gastropoda, 744 

 Invagination, 23* 

 Iridocytes, 762* 

 Iris, 39, 771* 

 Isomyaria, 698* 

 Isopoda, 567*, 583, 584, 585, 586, 587, 



593, 596, 597, 603, 677 

 Tsopteryx, 645* 

 Isopteryx apicali*, 645 



J 



AWS, 32 



Jelly-fish, Common (Aurelia aurita), 168 

 Jelly-fishes, 128 

 Jurassic, 7 



K 



K 



.ARYOGAMY, 59 



Karyokinesis, 16, 17 

 Keber's organ, 689, 706 

 Kidneys See Excretory system 

 King- Crabs, 653, 662, 666 

 Kingdom, 5* 

 Koonunya, 566 

 Kraussina, 368 

 Krohnia, 316 



L 



IABIAL PALPI, of Pelecypoda, 685 

 Labial palps, 622 

 Labium, 622 

 Labrum, 620 



Labrum, of Apus, 529 : of A*tacu*, 542 

 of Scorpion, 655 : of Pcriplanela, 620 

 Ldbyrinthula, 65, 66 

 Lacinia, 622 

 Lacrymaria, 94 

 Lacteals, 34 

 Lac unit (bone), 27* 

 Lacunar system, 380 

 Lagena, 53 



Lamella; (of bone), 27, 28 

 Lampetia, 217, 222 

 Lamp- shells, 360 

 Lancet plate, 414 

 Land-snails, 734 

 Lantern ccelome, 400 



