INDEX 



379 



Sacculus, 217 



Salamanders, 151, 157 



Salientia, 157 



Saprophyte {see Nutrition, sapro- 

 phytic) 



Sarcodina, 27 



Sarcolemma, 171 



Sarcomeres, 171 



Sarcoplasm, 171 



Sarcostyles, 171 



Scaphognathite, 103, 107 



Scapula, 180 



Sciatic nerves, 214 ; veins, 195 



Sclerotic coat, eye, 218 



Seals, 162 



Sea-squirts, 141, 150 



Secretion, internal organs of {see 

 Endocrine system) 



Secretions, internal {see Hormones) 



Segmental ganglion, 95, 110 



Segmentation, Bee, 124-128; Cray- 

 fish, 99; Earthworm, 81; Grass- 

 hopper, 114-117; Insects, 113 



Segmentation cavity, 224, 234 



Selachii, 155 



Semicircular canals, 218 



Seminal receptacle, Bee, 131, Cray- 

 fish, 109 ; Earthworm, 93 ; Grass- 

 hopper, 121 



Seminal vesicle, Bee, 130; Earth- 

 worm, 92 ; Grasshopper, 121 



Sense-capsule, 153 



Sense organs, 98; Bee, 133; Clam, 

 148 ; Crayfish, 103, 111 ; Frog, 215 ; 

 Grasshopper, 123 ; Obelia, 70, 72 



Sense plate, Bee, 134 



Septa, 84 



Serosa, 186 



Setae, 82, 84, 111 



Sexual characters, 79, 102, 108, 109, 

 204 



Shank, 166 



Sharks, 155 



Sheath, medullary, 215 



Shell, Clam, 139; Hen's egg, 233; 

 Mollusca, 139 



Silk, formation of, 138 



Silk Worm, 138 ; cocoon, 138 



Sinus venosus, 193, 196 



Sinuses, blood, 105-107, 130, 144 



Siphons, Clam, 142, 143, 145 



Sirenia, 162 



Skeleton, 175; laboratory, 321-323; 

 Man, 177 



Skin, Frog, 166, 182, 189, 195, 197, 

 198, 201 ; laboratory, 319 



Skull, Frog, 175 ; Mammals, 176 



Slipper animalcule {see Paramecium) 



Slug, 139 



Snails, 139 



Snakes, 158 



Sol, 7 



Sole, 156 



Somatic layer, Frog, 228, 229 ; Chick, 

 235 



Somatopleure {see Somatic layer) 



Somites {see Segmentation) 



Species, 27 



Sperm, Bee, 130, 131; Clam, 116; 

 Crayfish, 108, 109; Earthworm, 

 92, 93 ; Frog, 204, 222 ; Grass- 

 hopper, 120; Hydra, 64, 65; 

 Mammal, 237 ; Volvox, 37 



Spermatic tubules, Bee, 121, 130 



Spermatids, 205 



Spermatocytes, 205 



Spermatogenesis, laboratory, 353 



Spermatogonia, 205 



Spermatophyta, 11 



Sperm ducts, Earthworm, 92, 93 {see 

 Vas deferens, Vasa efferentia) 



Sphenethmoid bones, 175 



Sphenodon, 164 



Spider crab, 101, 112 



Spinal cord, 208, 211, 226; labora- 

 tory, 345, 349 



Spinal nerves, Frog, 211, 213 ; Mam- 

 mal, 213 



Spiracles, 117, 119, 129 



Spireme, 6 



Spirilla, 13 



Spirogvra, 21 ; description, 11 



Splanchnic layer, Frog, 228, 229; 

 Chick, 235 



Splanchnopleure {see Splanchnic 

 layer) 



Spleen, 183 



Sponges, 52, 53 



Spongin, 52 



Sporozoa, 33 



Squalus, 155 



Squamata, 158 



Squamosal bones, 176 



Squid, 139, 141, 148 



