1898.] 



NATURAL SCIENCES OF PHILADELPHIA. 



543 



Wigandia 373 



Xanthomyx .... 229, 230 



Xema 132 



Xenopicus 210 



Xerophyllum .... 44, 313 



Yoldia 419 



Zaraelodia 84 



Zea 413 



Zenaidura ... 79, 208, 354 



Zexmenia 392 



Zinnia 392 



Zizania 46, 314 



Zonites 67 



Zonochroa 178 



Zonotrichia 139, 214 



Zornia 388, 393 



Zygadenus 45, 313 



Zygonyx 146 



