Sleeping-sickness paras: 
Sloth animalcules 
Skin of— 
3 rabbit . - 
Sepia . p 
sis skate i 
st Tunicate . 
“3 Vertebrates . 
Skull . é 
Skull of— 
vs Crocodilia . 
vi frog. ‘ 
PP haddock ‘ 
- lizard . . 
ve Mammals . 
“ pigeon . ri 
55 rabbit . . 
i skate . . 
33 snakes. . 
i 
Sloths . A 
Slough of snake 
Slow-worm . 
Slug. 
Snail (see Helix) 
Snakes. 
Solaster 
Solen . ‘ 
Solenia 
Solenomya . 
Solpuga 
Solpugidee or + Solifugse 
Somatic cells 
Somatopleure 
Somites = Segments 
Song of birds 
Sorex . . 
Spadella  . 
Spatangus . 
Spatularia . 
Species 
Spermathecze 
Spermatic cord 
Spermatophores 
Spermatozoa 
Spheeridia 
Sphzrozoum 
Spheerularia . 
Sphenethmoid 
Sphenodon *. 
Sphenotic 
. 
. 
. 
. 
. 
. 
te 
INDEX 
PAGE 
Spicules (of sponge) 
- Spider ia s 
Spiders 
Spinal cord . . 
3 ganglia 
yy) nerves 
Spinning glands of Insects 
»» of Spiders 
Spiracles of skate . 
Spiracular cartilage 
Spiral valve . 
Spirochete . . 
Spirula . 
Splanchnopleure . 
Spleen. qi 
» of frog i 
»» of pigeon . 
xy of rabbit 
», of skate 
“Splenial 
Sponge, development of a 
Sponges ‘ ‘ 
Spongilla 
Sporocyst 
Sporozoa 
Sporozoite 7 
Spring-tails . . 
Squamosal . . 
Squilla . : 
Squirrels 
Stagonolepis . 
Stapes of ear . 
Starfish ‘ 
Stegocephali . 
Stelechotokea 
Steller’s sea-cow . 
Stenothermal 
Sterno-tracheal muscles. 
Sternum of Crustacean 
ment 
of pigeon 
Stickleback . 
Stigmata. . 
Sting of scorpion . 
Stinging animals . 
» cells % 
Stipes . 7 7 
Stoat . . . 
Stolonifera . 
seg 
Stomatodeeum = Stomodzeum. 
