158 



INDEX. 



Macronucleus, 81, 32 



MacrozoSspores, 28 



Mammae, 128 



Mandible, 74 



Mantle, 58, 59, 65 



Mantle-cavity, 60 



Mauus, 96, 129 



Mass, visceral, 60, 61, 65 



Material, 27, 39, 48, 58, 66, 78, 



83 



Maxilla, 74 



Maxillary process, superior, 152 

 Maxilliped, 73, 74 

 Mechanical experiments, 25 

 Medulla, 138 

 Medulla oblongata, 108, 124, 140, 



141 



Medullary folds, 143, 147, 148 

 Medullary layer, 42 

 Medullary rays, 78, 80 

 Membrane, tympanic, 96 

 Mesenterou, 71 

 Mesentery, 99, 117, 129, 130 

 Mesoblast, 148 



somatic, 144, 148 



splanchnic, 144, 148 

 Mesoblastic somites, 148 

 Mesocarpus, 50 

 Mesonephros, 145 

 Mesophyll, 11 

 Metamerism, 14 

 Methods, 13, 25, 36, 50, 53, 54, 



55, 58, 94, 95, 143 

 Micrometer, stage, 6 

 Micronucleus, 31, 32 

 Micropyle, 87, 88 

 Microzoospore, 29 

 Mitral valve, 137 

 Mnium, 76 



Monocotyledon, 81, 92 

 Monro, foramen of, 109 

 Motile forms, 28, 29, 35 

 Mouth, 14, 17, 30, 33, 52, 61, 67, 



97, 128, 143, 144, 152 

 Movement, Brownian, 45 

 Muller, 86 

 Muscle, adductor, 58, 59 



Muscle, gastrocnemius, 111 



papillary, 137 



pectoralis major, 118 



pectoralis minor, 118 



sartorius, 111 

 Muscular layer, 16 

 Mustard, 82, 92 

 Mycelium, 39, 40, 43, 44 



Narcissus, 86 * 



Nares, anterior, 96 



posterior, 97 

 Nasal pits, 143, 150, 152 

 Naso-frontal process, 152 

 Neck, 116, 128, 151 

 Nematocyst, 53, 54, 55 

 Nephridia, 16 

 Nephridial openings, 15 

 Nerve, brachial, 110 



branchial, 62 



cranial, 151 



olfactory, 107, 108 



optic, 140 



pallial posterior, 62 



sciatic, 110 



septal, 21 



spinal, 110 



spinal thoracic, 124 

 Nerve-cord, ventral, 21, 23 

 Nerve-plexus, brachial, 110, 124, 

 140 



lumbar, 124 



lumbro sacral, 140 



sciatic, 110, 124 

 Nervous system, 20, 106, 123, 



139, 140 



Nervous system, central, 20, 72, 

 106 



peripheral, 21, 110, 124, 139 



sympathetic, 109, 123, 139 

 Nettle-batteries, 53, 54 

 Neural tube, 144 

 Mtella, 93 

 Node, 7 

 Nostrils, 128 

 Notochord, 144, 148 

 Nucellus, 87 



