320 



INDEX 



Segmental plates, 261 



duct, 275, 277 

 Segmentation, 43, 46, 166 

 Segmentation of head, 218, 246 

 Segments, 17 

 Semicircular canals, 245 

 Semper's cells, 138 



Sense plate, 258 



Septa, 21 



Serosa, 166 



Sharks, 203 



Shell, 54, 70, 86 



Shell-gland, of Distomum, 5 



of gastropods, 84 



of Apus, 93, 1 08, no 

 Shoulder girdle, 292 

 Sinistral shell, 72 



Sinus venosus, 224 

 Skeleton, of dogfish, 209 



of mammals, 289 

 Skull, of frog, 270 

 Snail, 53, 69-82, 88 

 Soft palate, 287 



Somatopleur, 40, 181, 198, 267, 301, 



30.3 



Somites, 17, 168 

 Spermatheca, 35, 81, 164 

 Spermathecal pores, 20 

 Spermatozoa, 35, 139 

 Spermiducal pores, 20 

 Spermophore, 81 

 Sperm sacs, 34, 232 

 Spiracle, 207, 220 

 Spiral valve, 219 

 Splanchnocoele, 199 

 Splanchnopleur, 40, 181, 198, 267, 



301, 303 

 Spleen, 220 

 Sporocyst, 10, 12 

 Squame, 123 

 Stapes, 291 

 Sternebne, 292 

 Sternum, 114, 115, 155, 292 

 Stigmata, 156, 161 

 Stipes, 152 



Stomatogastric nerves, 104, 136, 162 

 Stomodceum, 39, 87, 100, 124, 145, 



147, 158, 264 

 Streptoneurous, 79 

 Sub-apical lobe. 96 

 Sub-endostylar coelom, 182 



Submentum, 152 



Suckers, 2 



Sulci, 297 



Supra-renal capsules, 241 



Sweat glands, 285 



Sylvian aqueduct, 236, 278 



Sympathetic nervous system, 243 



Symplectic ligament, 215 



Synapticula, 178 



Syncerebrum, 105, 135, 144 



Systemic arch, 275 



Tadpole, 248 

 Tarsus, 154 

 Teats, 286 

 Teeth, 208, 287 

 Tegmina, 154 

 Teloblast, 40 

 Telson, 113 

 Tergum, 114, 155 

 Testis of Distcmum, 4 



of earthworm, 33 



of Apus, 106 



of crayfish, 139 



of cockroach, 162 



of dogfish, 232 

 Tibia, 154 



Thalamencephalon, 235, 278 

 Third ventricle, 235 

 Thoraco-abdominal swelling, 142, 



144 



Thymus gland, 293 

 Tongue-bars, 178 

 Torsion of larval gastropod, 87 

 Trabeculse cranii, 269 

 Tracheoe, 156, 161 

 Trager, 300, 303, 304 

 Trematoda, 2 

 Trigeminal nerve, 238 

 Trito-cerebrum, 168 

 Trochanter, 154 

 Trochosphere, 46, 49, 50, 84 

 Trophoblast, 300 

 Tunic at a ) 202 

 Turbellaria^ 2 

 Tympanic cavity, 266, 279 

 Typhlosole, 23, 28 



Umbilicus, 70 



Umbo, 54 



Urocardiac ossicle, 126 



