Yarn, 180. Yarrow, H. C., 98. Yellowstone River, 150. _Yetl_, 189 _et seq._ Young, E. R., 83. Yucatan, 215 _et seq._, 216. Zizania, 109. _Zuñi_, 89, 90, 161, 162, 176. Zuñian, 3.