erinla = great 4, etc.
40.

ogodzi = string.
200.

igba = heap.
The word for 40 was adopted because cowrie shells, which are used for counting, were strung by forties; and _igba_, 200, because a heap of 200 shells was five strings, and thus formed a convenient higher unit for reckoning.

Proceeding in this curious manner,[106] they called 50 strings 1 _afo_ or head; and to illustrate their singular mode of reckoning--the king of the Dahomans, having made war on the Yorubans, and attacked their army, was repulsed and defeated with a loss of "two heads, twenty strings, and twenty cowries" of men, or 4820.
The number scale of the Abipones,[107] one of the low tribes of the Paraguay region, contains two genuine curiosities, and by reason of those it deserves a place among any collection of numeral scales designed to exhibit the formation of this class of words.

It is: 1.