Skl"l of pig-embryo, [121]

Slimonia, [27], [56], [170], [235], [238], [249], [276], [303]

Solenocytes, [395], [477]

Solpugidæ, [109]

Sphæroma serratum, brain, [62], [90], [101], [225]

Spiders, eyes, [75]

Spi"ers, stomach, [109]

Spina bifida, [50]

Spinal cord, difference between brain and, [45]

Spi"al cr"d, region of, [385]