INDEX 



369 



Secretion, 142,154,183,207; internal, 

 219. 



Segmental duct, 113, 114. 



Segmentation cavity, 93. 



Segmentation of egg, 89. 



Semicircular canals, 335, 337. 



Semilunar valves, 267. 



Seminal vesicle, 77, 216. 



Sense organs, 321 ; plate, 100. 



Serosa, 139. 



Sex differences, 186, 306 ; recognition, 

 305 ; organs, 35, 74, 115, 212. 



Sexes, proportions of, 51. 



Sheath of Schwann, 131. 



Shoulder girdle, 238. 



Sinus venosus, 265 ; beating of, 279. 



Sirenidas, 3, 4. 



Siren lacertina, 5. 



Skin, 66, 173, 179, 321, 350; absorp- 

 tion by, 58, 59; color changes of, 

 37, 58, 187-197; respiration of, 

 173 ; shedding of, 59. 



Skull, 229. 



Smell, sense of, 25, 324. 



Spea, 12. 



Spermary, seeTestis. 



Spermatozoa, 83, 85, 87, 216. 



Sphenethmoid, 232. 



Spinal cord, 80, 103, 284; reflexes of, 

 300. 



Spinal nerves, 104, 284, 289, 300. 



Spiracle, 118, 119. 



Spiral valve, 267. 



Splanchnic layer, no. 



Spleen, 74, 221. 



Sporozoa, 42,43. 



Squamosal, 232. 



Sternum, 240. 



Stomach, 74, 138. 



Stomodeum, 106. 



Subcutaneous lymph spaces, 280; 

 tissue, 179. 



Submucosa, 139, 149. 



Subserosa, 139. 



Sucker, 100, 118. 



Sulcus marginalis, 68, 



Suprascapula, 239. 



2B 



Surinam toad, 12. 

 Suspensorium, 232, 236. 

 Sympathetic system, 284, 298. 

 Symphysis, public and ischial, 243. 

 Systemic arch, 270. 



Tadpoles, 39, 116-119. 



Taenia dispar, 41. 



Tarsus, 244. 



Taste, organs, 322 ; sense of, 25, 322. 



Teeth, 68, 71, 118. 



Temperature, effects of, 55-58. 



Tendon, 124. 



Testis, 77, 215. 



Tetracotyle crystallina, 42. 



Thalamencephalon, 104, 291, 293; 



function of, 311. 

 Thalamus, 104, 311. 

 Thigmotaxis, 351. 

 Thymus, 109, 223. 

 Thyroid, 109, 222. 

 Tibiale, 244. 

 Tibio-fibula, 243. 

 Toads, 13-16, 59, 211, 357. 

 Tongue, 26, 70 ; sense organs of, 322. 

 Touch corpuscles, 321 ; papillae, 321. 

 Triton, 10, 351. 

 Tropisms, 342. 

 Truncus arteriosus, 112, 264. 

 Trypanosoma, 42. 

 Trypsin, 151. 



Tuberculum prelinguale, 69. 

 Tunica albuginea, 215. 

 Tylodelphis rhachidis, 42. 

 Tympanic bone, 232; membrane, 63, 



69, 109, 336. 

 Typhlomolge, 3, 4. 

 Typhlotriton spelseus, 8. 



Urea, 207, 219. 



Ureter, 115, 202. 



Urinary bladder, 77, 209; tubules, 



115, 202, 208. 

 Urodela, 3', 165. 

 Urostyle, 237, 238. 

 Uterus, 77, 214. 

 Utriculus, 335. 



