850 INDEX 
PAGE 
Sense organs of— 
5 spider . + 368 
starfish ‘ + 256 
” 
a Vertebrates + 492 
Sepia . . : . + 402 
Sepiostaire . : : + 405 
Serpents. . : - 628 
Serpula - j 2 # 233 
Serranus. : é - 561 
Sertularians . ‘i . . I71 
Sesamoid bones . ‘ + 700 
Sete . : + 213, 283 
Sex, evolution of . . 2 54 
Sexual selection . 812 
$5 » among birds | 677 
33 >». amongspiders 371 
»»  Yeproduction . 52 
‘5 45 divergent 
modes of . , é . 56 
Sharks. . a - - 567 
Shell of— 
59 Anodonta . + 393 
#5 Argonauta . » 429 
3 Cephalopoda - 428 
rs Chiton. i » 417 
a5 Helix . j - 384 
sc Nautilus ‘ « 433 
53 Planorbis_ . + 431 
‘3 Scaphopoda . + 424 
Spirula . » 429 
Shell gland or sac . + 301 
Shore-crab . ‘ . + 310 
Shrews ‘ ‘ : . 780 
Shrimp . 3 é + 309 
Sida. . é + 301 
Silicispongize ‘ A + 133 
Simia . ‘; : ‘ . 788 
Simiidze : 788 
Simplicidentata . ‘ » 773 
Sinews . . . 
Sinus venosus.. + 505 
Siphon of Cephalopods. + 428 
», of Gasteropods . + 422 
», Of Lamellibranchs . 426 
Siphonaptera ‘ + 360 
Siphonoglyphes ‘3 ‘ 
Siphonophore . - 7 
Siphonops . . - - 606 
Siphonozooid . ‘ 
Siphuncle of Nautilus , 
Sipunculidz . 
Sipunculus . 
Siren . E : : 
Sirenia 
Skate . : 
55 development of . 
Skeleton of— 
3 Amphioxus . 
ay Balanoglossus 
>» bat . 
35 Birds . : 
a0 Chelonia  . 
i crayfish 
i Crinoids 
a6 Crocodilia . 
9x frog. 
we haddock 
1 Hatteria . 
% Lizards 
es Mammals , 
49 Myxine 
e Petromyzon . 
45 pigeon . . 
ss rabbit . . 
5 sea-urchin . 
53 Sepia é 
- skate . " 
<3 Snakes. < 
- starfish . . 
33 Vertebrates . 
Skin of— 
Amphioxus . 
ye Anodonta 
4 Balanoglossus 
a Birds 
58 cockroach . 
sik crayfish ¥ 
sti Crocodilia . 
a earthworm . 
- Fishes . 
5 frog. ‘ 
pe haddock, 
x8 Helix . . 
ae Insects. ‘ 
a5 Leech . . 
- Lizards ‘ 
7 Mammals , 
we Myxine 'e 
” Peripatus . 
os Petromyzon , 
