298 



INDEX 



Sciatic artery, 51 



Sciatic nerve, 60 



Sciatic plexus, 60 



Sciatic vein, 54 



Sclerotic, 69 



Sclerotium, 154 



Scyphozoa, 284 



Secondary cysts, 152 



Secretions, 7 



Sections, method of, 256 



Segmentation cavity, 128 



Segmentation of ovum, 126 



Semicircular canals, 71 



Semilunar valves, 48, 57 



Sense capsules, 26 



Sensory root of nerve, 61 



Septum medium, 48 



Serial homology, 35 



Sex, 243 



Sexual development of Hydra, 236 



of Plasmodium, 180 



Shoulder girdle, 30 



Sinus venosus, 46, 56 



Skein, 112 



Skeleton, 6 



Skull, 22, 24 



Solar plexus, 68 



Somatic cells, 210 



Special senses, 9 



Species, 2, 285 



Sperm aster, 125 



Spermatids, 118 



Sperm nucleus, 123 



Sperm sacs, 162 



Spermatocytes, 118 



Spermatogonia, 118 



Spermatozoa, 117, 118, 122, 247 



Sphenethmoid bone, 26 



Spinal cord, 58 



Spinal nerves, 60, 61 



Spindle, mitotic, 114 



Spiral valve, 48, 57 



Spireme, 112 



Spleen, 43 



Splenic artery, 51 



vein, 55 



Spongioplasm, 97 

 Sporangium, 158 

 Spores, 139, 153, 158, 161, 281 

 Sporoblasts, 166, 184 

 Sporocyst, 158 



Sporophore, 163 



Sphorophyte, 281 



Sporoplasm, 167 



Sporozoa, 161 



Sporozoites, 168, 177, 178, 184 



Squamosal, 28 



Stalk of Vorticella, 235 



Starch, in Infusoria, 203 



Stegocepkalia, 63 



Sterewn hirs^^t^l^n, 154 



Sternum, 30 



Stigma, 192 



Stock (see Colony) 



Stomach, 40 



Stomata, 39 



Stratified epithelium, 85 



Statocysts, 275 



Stratum Malpighi, 85 



Streaming movements, 131, 148, 



I55> 221 



Striped muscle, 94, 9^ 

 Subclavian artery, 51 



vein, 52 



Subscapular vein, 52 

 Subumbrella, 274 

 Superior oblique muscle, 65 

 Supination, 31 

 Suprascapula, 30 

 Suspensory apparatus of jaw, 27 

 Sylvian aqueduct, 62 

 Symbiosis, 216 

 Sympathetic ganglia, 58, 68 

 Sympathetic nerve system, 58, 67 

 Symphysis, 33 

 Synangium, 48, 57 

 Synapsis, 1 20 

 Synkaryon, 158, 183 

 Systemic aortic arch, 48, 58 

 Systole, 220 



Tadpole, 28 



Tarsus, 17 



Taste cells, 88, 90 



Teeth, 7, 18 



Telophase, 115 



Telosporidia, 163 



Tendo Achillis, 21 



Tendons, 21, 101 



Tentacles of Hydra, 250, 253 



of Obelia, 272, 274 



Testes, 43, 266 



