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 



Stegocephalia, 63 



Stcreitm hirsutum, 154 



Sternum, 30 



Stigma, 192 



Stock (see Colony) 



Stomach, 40 



Stomata, 39 



Stratified epithelium, 85 



Statocysts, 275 



Stratum Malpighi, 85 



Streaming movements, 131, 148, 



I5S 221 



Striped muscle, 94, 95 

 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, 120 

 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 



