400 INDEX-GLOSSARY. 



Swine, 354. 



Sylvian aqueduct, 169, 211, 253, 302. 



Sylvian fissure, 336. 



Symmetry Bilateral s., 28, 54, 75, 154, 311 ; Radial s., 20, 311. 



Sympathetic system A special set of nerves supplying the internal organs, 



82, 101, 104, 171, 215; Columba, 254; Lepus, 303. 

 Symphysis (a-i/v, together ; <t>v<ri; t a growth) A median fusion of two bones ; 



Ischio-pubic, 18, 282 ; Mandibular, 183, 236, 276, 325; Pubic s., 327. 

 Synangium (avv, together ; uyytTtv, a vessel), in the Frog That part of the 



truncus arteriosus from which the aortic arches arise, 196. 

 Syrinx (ffupiy%> a reed-pipe) The vocal organ of birds, situated at the 



bifurcation of the trachea, 248. 

 Systemic, of heart Distributing oxygenated blood to the body in general, 



97, 115, 128, 315. 

 Systole (<7t/<rToA, used with the modern meaning) The contraction of a 



heart, or the chamber of a heart, 97. 



Tactile Organs Hirudo, 82 ; Astacus, 103 ; Anodonta, Uiiio, 120 ; Helix, 



133 ; Amphioxus, 146 ; Scyllium, 172 ; Rana, 218 ; Columba, 254 ; 



Lepus, 303 ; Comparison of, 320. 

 Tsenia, 340 ; 39-45. 

 Tail, 229, 269. 

 Tapeworm = Ta3nia, q.v. 

 Tapir, 349, 355. 

 Tarsometatarsus, in the Pigeon A bone formed by the union of the distal 



part of the tarsus with three of the metatarsals, 241. 

 Tarsus (rap<ros, the sole of the foot) The ankle or the ankle bone, 176, l!S7, 



241, 282, 328. 



Taste. See Gustatory Organs. 

 Teats, 269. 

 Teloblast (<ri>.of, the end ; /3Xao-Tf, a germ) An embryonic cell which by 



division gives rise to a cellular band, 70, 148. 

 Teleostei, 153. 

 Telson (rUo-ov, the termination, the end), in the Crayfish The last segment 



of the body, 86. 



Tendon A fibrous cord by which muscle is attached, 91, 178, 208. 

 Tentacles A small projecting finger-like part of the body, usually 



sensory, 19, 312. 

 Tergum (tergum, the back), in the Crayfish The dorsal part of the exo- 



skeleton in each segment, 84. 



