GENERAL INDEX 535 



Skeleton, aponeurotic, 414 



,, Cephalaspis, 414, 415 



,, evidence of the, 119 



,, Limulus, cartilaginous, 126, 136 



,, ,, mesosomatic, 137 



,, ,, prosomatic, 142 



,, Petromyzon, 125 



,, Vertebrate, commencement of bony, 120, 121 

 Skin, digestive power of cells of, in Ammocoetes, 58, 442 

 ,, of Ammocoetes, 346 

 ,, nerves of, 448 

 Skull of dogfish, 123 



pig-embryo, 121 

 Slimonia, 27, 56, 170, 235, 238, 249, 276, 303 

 Solenocytes, 395, 477 

 Solpugidee, 109 



Sphseroma serratum, brain, 62, 90, 101, 225 

 Spiders, eyes, 75 



,, stomach, 109 

 Spina bifida, 50 

 Spinal cord, difference between brain and, 45 



„ ,, region of, 385 



,, „ termination in bird-embryo, 51 

 Spondylus, retina of, 114 

 Squilla, eyes, 100 



„ glands, 422 

 Stomach, cephalic, 4, 43, 102, 244 

 Stylonurus Lagani, 27, 235, 239, 249 

 Substantia gelatinosa Rolandi, 44 

 Suprarenal body, 423 

 Surfaces, dorsal and ventral, 11 



reversal of, 15, 29, 36, 87, 175, 352, 433, 484 

 Synapse, 72 

 Syncytium, 464, 471, 479 



Tail of lizards, 50 



Tapetum, 69 



Teleosteans, 23, 345, 420, 424 



Tendon-organs, 470 



Tentacles of Ammocoetes, 246, 289, 303 



Tergo-coxal muscles, 247 



Test, biological, of relationship of animals, 492 



Thalainencephalon, 48 



Thelodus, 344 



Thelyphonus, 231 



brain, 53, 54, 56, 224 



() ,, caudal, 450 



,, coecal diverticula, 109 



,, entosternite, 143 



,, genital organs, 206 



lyriform organs, 368 



,, olfactory passage, 226, 306 



