INDEX-GLOSSARY. 405 



Whiskers, 268, 271. 



White matter, of Brain and Spinal Cord The part mainly composed of 



nerve fibres, 172, 215. 

 Will, 102. 



Wind-pipe (Trachea), 248, 293. 

 Wing, 230 Bastard w., 230. 

 Wolffian body = Mesonephros, q.v. 

 Wolffian duct = Duct, mesooephric, q.v. 

 W T orm -castings, 59. 

 Wrist Carpus, q.v. 



X 



Xanthin, 41. 



Xiphisternuni The posterior, more or less cartilaginous part of the 

 sternum, 185. 



Yang-tse-Kiang, 34. 

 Yeast, 58. 

 Yolk, 23, 252. 

 Yolk-gland, 33, 43. 

 Yolk-reservoir, 33. 

 Yolk-sac, 167, 265, 308, 338. 



Zona radiata, in Mammalia A radiately striated membrane which invests 

 the ovum, 299, 306, 308. 



Zooid (*, a living creature) ; in Protozoa and colonies of other groups 

 The individual, 15. 



Zoology (&ov; *.i>yo;, a speech, discourse), 1. 



Zoological Regions, 350. 



Zoophyte (<2<9v ; <t>vrev, a plant), 27. 



Zonitic constrictions, in the Earthworm Shallow grooves, of which one 

 or more encircle each segment, 54. 



Zygapophysis (%vyov, a yoke; <<;, a process) A process projecting 

 from the front or back of a neural arch, and assisting in the articu- 

 lation of adjacent vertebrae, 184, 237, 278. 



Zygoma (^uyupa,, a bar or bolt), in the Mammalian skull A bony bar below 

 the orbit and temporal fossa, 272. 



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