INDEX 



291 



itelline membrane, 247 



vessels, 226, 248 

 iviparous Amphibia (Salamandra), 231 



Fishes, 227, 229 

 Lizard (Anguis) : 239 

 Mollusc (Paludina, syn. Vivi- 



para), 167 

 'olvox, 23, 38, 59 



'orticella, 21, 51 ; compared with Para- 

 me.cium, 52 



WALRUS (Trichechus), 262 

 i/arble-flies, 144 



^ater-vascular system, 163, 164 

 /halebone (" baleen "), 269 

 Shales, 262, 269 



Whelk. See Buccinum. 



Wing of Bat, 272 



Wing of Bird, 242 



Wolffian body. See Mesonephros. 



Worms, 18, 89-126 



Wright's bodies, 45 



YAWS or framboesia, Cause of, 47 



Yellow cells, 116 



Yellow fever. Carrier cf, 143, 151 



Yolk, 214 



Yolk-sac, 226, 242, 248 



ZOOPHYTE, 81 

 Zoospores, 33 

 Zygote, 9, 12 



