13 X 20 days, or 260, would elapse before the sign I. cipactli would recur. This period of 260 days constituted the ritual and divinatory calendar, known as the tonalamatl. The tonalamatl was subdivided in various ways; in some manuscripts each of the twenty thirteen-day periods, or "weeks," is shown separately, together with the figure of a god who was especially associated with the first day, but whose influence was supposed to extend over the whole "week." The deities presiding over the successive "weeks" of the tonalamatl are given in one MS. (Vaticanus A) as follows, the date preceding the name of each being that of the first day of each "week."
1. cipactli, Tonacatecutli.
1. ocelotl, Quetzalcoatl.
1. mazatl, Tepeyollotl.
1. xochitl, Ueuecoyotl.
1. acatl, Chalchiuhtlicue.
1. miquiztli, Tonatiuh.
1. quiauitl, Tlaloc.
1. malinalli, Mayauel.
1. coatl, Tlauizcalpantecutli.
1. tecpatl, Tonatiuh.
1. ozomatli, Patecatl.
1. quetzpalin, Itztlacoliuhqui.
1. olin, Tlazolteotl.
1. itzcuintli, Xipe.
1. calli, Itzpapalotl.
1. cozcaquauhtli, Xolotl.
1. atl, Chalchiuhtlicue.
1. eecatl, Chantico.
1. quauhtli, Xochiquetzal.
1. tochtli, Itztli.
There is however some variation in the assignment of the week-gods, e.g. Sahagun gives I. miquiztli to Tezcatlipoca, 1. acatl to Quetzalcoatl, 1. tecpatl to Uitzilopochtli, etc. Within the weeks, many indi-
