334 



INDEX 



Septum, interatrial, 235, 242, 252 



interauricular {see Septum interatrial) 

 transversum, 232, 233 

 Sertoli cell, 36. 37, 38, 39, 40 

 Sex, characteristics of, female, 18, 43 

 male, 18, 31, 35 

 differentiation of, 228 

 Sex cell cord, 227, 231, 252 

 Sex cord, 230 

 Sheath, of vertebral column {see under 



Vertebral column) 

 Shumway, W., 27, 28, 29 

 Sinus, superior, of the ear, 777 

 Sinus venosus, 145, 149, 158, 164, 234, 



235, 238, 247 

 Siredon pisciformis, 173 

 Skeleton, appendicular, 218 



visceral {syn. splanchnocranium), 21, 



98, 143, 213, 214, 216, 249 

 Skin, 18, 159,211,257 

 Skull {see also Neocranium), 213 

 process of, anterior, 214 

 posterior, 214 

 Slit, gastrular, 112, 113,114,115,116,125 

 Soma {syn. somato-plasm, somatic tissue), 



13, 14 

 Somatopleure, 137, 150, 151, 152, 181, 



219 

 Somite {syn. segmental plate) {see also 



Mesoderm, somite), 101, 102, 



129, 137, 145, 146, 146, 147, 



152, 158, 183, 209, 210, 211, 252 

 Spaces {see also specific space), 24 

 Spek, 98 



Spemann, H., 8, 705, 113, 116,778 

 Spermatid, 33, 35, 36, 37, 38, 39 



metamorphosis of, 33 

 Spermatocyte, 36, 37, 38 

 Spermatogenesis, 32, 33, 35, 35, 36, 37 

 Spermatogonium, 32, 33, 34, 35, 36, 37, 



38,59 

 Spermatozoon, 5, 32, 33, 35, 35, 36, 37, 



38, 38, 39, 39, 74, 78, 80, 83, 



222 

 Spermist {see also Preformationism), 5, 



6, 12 

 Spinal canal {see Neurocoel) 

 Spinal cord {see also Nerve cord), 163, 



168, 185, 190,251 

 horn of, dorsal, 769 

 ventral, 769 



Spinal cord — {Continued) 

 layer of, mantle, 191 



marginal, 191 

 matter of, gray, 167, 757 

 white, 769, 187 

 Spindle, mitotic, 81 

 Spiracle, 21, 23, 23. 25, 26, 134, 157, 197. 



245 

 Splanchnocoel {see Coelom) 

 Splanchnocranium (see Skeleton, visceral) 

 Splanchnopleure, 137, 151, 152, 181, 219, 



227 

 Spleen, 245, 247, 259 

 Spore formation, 1 1 

 Spratt, N. T., Jr., 8 

 Squamosal bone, 216 



Stage, contraction {syn. synizesis), 33, 34, 

 57 

 diakenesis, 35 

 embryonic, 1 

 leptotene, 33, 34, 57 

 multiplication, in maturation, 33 

 pre-gastrulation, 103 

 synaptene, 33, 34, 57 

 Stain, Nile blue sulfate. 98 



vital {syn. vital dye), 98, 700, 104 

 Stapes cartilage bone {syn. stapedial 



plate), 216, 252 

 Starfish, 13 

 Stenger, A., 224, 225 

 Sternum, 218 

 Stilling cells of adrenal gland {see under 



Adrenal gland) 

 Stomach, 53, 205, 205, 208, 227, 245, 259 

 Stomodeal cleft {see under Cleit) 

 Stomodeum, 98, 7iO, 144, 149, 189, 192, 



193 

 Stroma, ovarian, 45, 57, 70 

 Structure(s), accessory, 41 



epidermal, 98 

 Sucker, oral, 27, 22, 23, 101, 102, 105, 128, 

 129, 130, 150, 152, 156, 164, 

 244, 252, 254 

 Superior cavity of the olfactory organ {see 



under Olfactory organ) 

 Surface sacs of the nucleus {see under 



Nucleus) 

 Sutton, 7 

 Swammerdam, 5 



Swimming response {see under Response) 

 Swingle, W. W., 8, 231 



