Muscular system of— 
53 Arenicola  . 
5 Ascidian 
we Aurelia # 
8 Balanoglossus 
5 Birds . "I 
Y cockroach . 
4s crayfish ‘ 
53 earthworm 
rog . 
$5 haddock ‘ 
5 Helix . . 
ag Hirudo < 
” Insects ‘i 
ia Myxine Fs 
% Peripatus 
aa Petromyzon . 
59 pigeon . . 
a rabbit . 
se Sepia . e 
aS skate ; 
starfish e 
Muscular tissue . 
Musk deer 7 
», glands . 
Mussel ‘ ‘ 
»» fresh-water 
Mustela 
Mustelus 
Mya . 
Mycetes 
Mycetozoa . 
Myelencephalon 
Mygale . 
Myodes é ‘ 
MM araeres or Myotomes 
Myomorpha . 
Myotomes 
Myriopoda -. 
Myrmecobius 
Myrmecophagide . 
Myrmecophagus . 
Mysis . : : 
Mystacoceti . F 
Mytilus . 
Myxine ‘ . 
3 and Petromyzon 
trasted . . 
Myxospongida . . 
Myzostomata . . 
con- 
INDEX 
PAGE 
Nais . . . ‘ 
Naja . , . 
Narwhal ¢ a 
Nasal capsule : . 
Nasilis . : 7 
Natural selection . : 
Nauplius. . 
Nautilus . . 
Navel . . ‘ # 
Nearctic region . ‘ 
Nebelia ‘ . . 
Nectonema . 7 . 
Necturus i 7 Fi 
Nekton > . . 
Nematocysts. . . 
Nematoda . é i 
Nematohelminthes 
Nemertea or Nemertines 
Neomenia 
Neomylodon. 
Neornithes . 
Neotropical region 
Nephelis . . 
Nephridia of crayfish 
<5 of earthworm . 
<5 of leech . 
a of mussel - 
se of Peripatus . 
of Vertebrates 
Nephridioblast 
Nephrops . 
Nephrostoma of kidney 
Nephthys : 
Nereis . . . 
Nerve cells . 4 
Nerve fatigue . 
s» fibres. a 
» tissue. 
Nerves, cranial 
Nervous activities in Animals 
Nervous system of— 
oe Amphioxus . 
5 Anodonta 
a Arenicola 
Pe Ascidian 
a5 Aurelia 
x Balanoglossus 
‘9 bee. 
93 Cephalopoda 
i Cheetognatha 
