INDEX. 347 



X. 



Page 



Xanthium canadense 117 



echinatum 46, 117 



Xiphidium brevipenne 229 



f asciatum 229 



nigropleura 229 



Y. 



Yax, Austin 265, 309, 311, 312 



Z. 



Zamelodia ludoviciana 31, 275, 293 



Zanthoxylum americanum 23, 101 



Zapus hudsonius 310 



Zeamays 191, 201, 208, 210, 212 



Zenaidura macroura carolinensis • 274, 283 



Zizania aquatica 77 



Zizia aurea 105 



Zonitidae 154 



Zonitoides arborea 142, 143, 144, 145, 146, 147, 148, 149, 155 



milium 125, 149, 156 



niinuscula 142, 143, 147, 148, 149, 156 



nitida 142, 143, 147, 148, 149, 155 



