140 



Index and Glossarv. 



LAB 



T ABIUM, the lower lip of an 



L/ insect's mouth, 1 16 



Labrum, the upper lip of an insect's 

 mouth, 116 



Lac insect, 124 



Lacunae, interspaces between tis- 

 sues. 



Ladybird, 131 



Lameilibranchs, bivalve molluscs, 

 such as the oyster, 81 



Lampyris, the firefly, 120 



Larva, the first active stage of an 

 animal while as yet immature, 



T2I 



Leaf-roller moths, 129 

 Leeches, 68 

 Lepidoptera, 129 



Ligament, a fibrous band uniting 



two parts. 

 Ligula, part of the so-called tongue 



of an insect, 117 

 Limulus, the king crab, 103 

 Lingula, the duck-hill shell, 81 

 Lithobius, the common centipede, 



"1 



Locusts, 125 

 Lug-bait, 71 

 Lymexylon, a wood-boring beetle, 



TV/TACRURA, lobsters, 107 



*** Madrepores, reef - building 



corals, 45 

 Madreporiform plate, a rough plate 



on the surface of star-fishes, 52 

 Magosphaera, 21 

 Malacobdella, a leech, 69 

 Malpighian glands, glands in insects, 



named after their first describer, 



Malpighi, 120 

 Mandibles, the second pair of jaws 



in insects, TOO 

 Mantle, the leathery outer ayer n 



molluscs, 14, 79 

 Mason spiders, in 

 Maxilla, 100 



Meandrina, brain coral, 46 

 Medusa, a jelly-fish, 40 

 Medusoids, detached portions of 



hydroids which resemble medusae, 



Meloe, 132 



Mentum, part of an insect's mouth, 



118 

 Mermis, 66 



ORT 



Mesenteries, folds of membrane sus- 

 pending the digestive sac, 43 



Metamorphoses, changes undergone 

 by an animal in its development 

 from its larval to its perfect state. 



Metazoa, animals with an internal 

 cavity, 28 



Millepedes, 114 



Mimicry in animals, 12 



Mites, 109 



Mollusca, 14, 78 



Monads, small fl gel'ate animals, 28 



Monera, the simplest known ani- 

 mals, 21 



Monocystis, a gregarine, 23 



Morphology.the science which treats 

 of the form* of animal organisms, 7 



Moss polypes 74 



Moths, 130 



Muscles, 4 



Mussels, 85 



Myriopoda, 98, 112 



TVTAUPLIUS, the larval stage of 



A ^ crustaceans, 104 



Nautilus, the most complex of 

 molluscs, 92 



Nematelmia, 64 



Nemerteans, marine worms, 60 



Nerve, 4 



Neuromuscular cells, 33 



Neuroptera, an order of insects, 127 



Noctiluca, a luminous marine ani- 

 malcule, 27 



Nucleolus, 26 



Nucleus, 21 



Nutrition, 4 



/^vCULAR plates, plates bearing 



V - / eyes, 54 



Ocuhna, a coral, 45 



CEsophagus, the tube which conveys 

 food to the stomach, 65 



Oikosites, parasites which live with, 

 but do not feed on, their host, 120 



Operculum, the lid which closes the 

 mouth of an univalve shell, 87 



Ophiolepis, a star-fish, 51 



Ophiurqidea, star-fishes, 75 



Ophrydium, 27 



Optic nerve, the nerve which con- 

 nects the eye and the brain, 99 



Organism, an animal made up of 

 separate organs or parts, 13 



Orthoptera, an order of insects, 125 



