Social organization 269 Clans and totems 269 Chiefship 275 Adoption 277 Marriage 279 Mortuary customs 287 Serial place of Seri socialry 293 Language 296 Comparative lexicology Index Footnotes ILLUSTRATIONS Page Plate I. Seriland 9 II. Pascual Encinas, conqueror of the Seri 13 III_a_. Seri frontier 40 III_b_. Sierra Seri, from Encinas desert 40 IV_a_. Sierra Seri, from Tiburon island 42 IV_b_. Punta Ygnacio, Tiburon bay 42 V_a_. Western shore of Tiburon bay 44 V_b_. Eastern shore of Tiburon bay 44 VI_a_. Recently occupied rancheria, Tiburon island 80 VI_b_. Typical house interior, Tiburon island 80 VII_a_. House framework, Tiburon island 110 VII_b_. House covering, Tiburon island 110 VIII. Sponge used for house covering, Tiburon island 112 IX_a_. House skeleton, Tiburon island 114 IX_b_. Interior house structure, Tiburon island 114 X. Typical Seri house on the frontier 117 XI. Occupied rancheria on the frontier 119 XII. Group of Seri Indians on trading excursion 121 XIII. Group of Seri Indians on the frontier 137 XIV. Seri family group 139 XV. Seri mother and child 142 XVI. Group of Seri boys 144 XVII. Mashém, Seri interpreter 146 XVIII. “Juana Maria”, Seri elderwoman 150 XIX. Typical Seri warrior 154 XX. Typical Seri matron 156 XXI. Seri runner 158 XXII. Seri matron 160 XXIII. Youthful Seri warrior 162 XXIV. Seri belle 164 XXV. Seri maiden 166 XXVI.