MAGELLANIA, Shell, 360,361: Body, 362: 

 Mantle-lobes, 362 : Mantle-cavity, 

 362: Lophophore, 362, 363; Food- 

 groove, 362 : Digestive organs, 362 : 

 Body- wall, 363 : Muscular system, 364 : 

 Ccelome, 365 : Blood system, 365 : Ex- 

 cretory organs, 365 : Nervous system, 

 365 : Reproductive organs, 366 : Posi- 

 tion of example, 367 

 MageUania ftnvesccns t 360 

 Maggot, 649* 

 Maia, 569, 596, 600 

 Malacocotylea, 252 See Digenetica 

 Malacostraca, 565*, 570, 579, 593, 594, 



596, 597, 601 

 Malaria parasites, 86 

 Malleus (of Rotifera), 325 

 Malpighian tubes, 617, 625 

 Malpighian tubes, of Scorpion, 656 : of 



Arachnida, 668 : of Tardigrada, 675 

 Mandibles See Appendages 

 Manducation, 434* 

 Maittidce, 636 

 Mantle lobes, 362 



Mantle, of Anodonta, 684 : Pelecypoda, 



698 : Amphineura, 713 : Triton, 725 : 



Gastropoda, 740 : Scaphopoda, 757 : 



Sepia, 762 : Nautilus, 781 



Manubrium, of Medusa, 129 : of Obelia, 



130 

 Marginal lappets, of Aurelia, 168*, 169, 



179 



Marginal sense-organs, 135* 

 Marginal tentacles, of Aurelia, 168*, 



169 



Marine Annelids, 439 

 Mastax of Rotifera, 325 

 Mastigamccba, 70, 71 

 Mastigophora, 45* : Example, 67 : Clas- 

 sification, 69 : General organisation, 

 69: Systematic position of the example, 

 70 



Matrix of connective tissue, 25* 

 Maturation, 19*, 20 

 Maxilla See Appendages 

 Maxillary palp See Appendages 

 Maxillipeds See Appendages 

 Maxillutae, 638* 

 May-flies, 633 

 Measly pork, 310 

 Medulla, of Actinosphwrium, 57, 58 : 



Monocystis, 80 : Paramoecium, 88, 89 

 Medullary sheath, of Nerve-fibre, 29*, 30 

 Medusa- buds, of Obelia, 129 

 Medusse, of Obelia, 134, 135 

 Megadrili, 466*, 467 

 Megagametes, of Flagellata, 76* : Spo- 



rozoa, 84, 85, 86 : Ciliata, 99 

 Megagametocyte, 84, 85 

 Megalaesthetes, 717 

 Megalopa stage, 599 



Megameres, of Ctenophora, 217, 218 : 

 of Polyclad, 274 - 



Meganucleus, of Ciliata, 93: r,n- 



matcium, 88, 89 : Dinoflagellata. 78 

 Megaspheric forms, 55, 56 

 Megaspores, of Radiolaria, 63 

 Megazooid, of Vortirella. 96, 98 

 Meleagrina, 696, 710 

 Meleayrina maryaritifera, 711 

 Melicerta, 328, 330, 331 

 Melolontha, 643 

 Membranes, 24 

 Membranipora, 347 

 Mentum, 622 

 Meridional canal, 213 

 Meroblastic, 22* 

 Merogony, 21* 

 Merozoa, 253* See Polyzoa 

 Merozoite, 84*, 85, 86 

 Mesenchyme, 389 

 Mesenteric filaments, of Fll><llnm, 2C6 : 



of Sea-anemone, 187* 

 Mesenteries, of Sea-anemone, 187, 182* 

 Mesenteries, development of, in Sea- 

 anemones, 192, 193 : Arrangement in 

 Actinozoa, 200 

 Mesenteron, 187 

 Mesoblast, 23* 

 Mesoccele, 356* 

 Mesoderm, 23*, 219* 

 Mesoderm bands, of P<*ri{>lii<-t(i, 631 

 Mesogkea, 110*, 111 : of OMia, 131* 

 Mesonemertini, 296* 

 Mesopodium, 725, 739 

 Mesosoma, 654* 

 Mesostomum, 272 

 Mesothorax, 622 

 Mesotrochal, 486* 

 Mesozoa, 230 



Messmateism See Commensalism 

 Metabolism, 13* 

 Metaccele, 356* 

 Metacrinus interruptus, 424 

 Metagenesis, 40* : of Foraminifera, 56 : 

 Obelia, 139 : Leptolinse, 152 : Tra- 

 chylinse, 156: AiLrelia, 173: Liver- 

 Fluke, 243: Tcenia, 250: Platyhel- 

 minthes, 273 : Nematoda, 310 

 Metameres, 43*, 523 

 Metamerism, 523 



Metamorphosis, of Trachylinae, 155: Sea- 

 anemone, 193 : Platyhelminthes, 273 : 

 Nemertinea, 295 : Phoronis, 359 : A*- 

 terina, 388 : Antedon, 432 : Ecliino- 

 dermata, 430 : Chsetopoda, 487 : Apnx, 

 537 : Crustacea, 597 : Insecta, 649 

 Metamorphosis, retrogressive See De- 

 generation 

 Metanauplius, 539 

 Metanemertini, 296* 

 Metapodium, 725, 739 

 Metathorax, 622 

 Metazoa, 19*, 105 

 Metentera, 187* 

 Micrajsthetes, 717 



