gaṅgā-snāna - bath in the Ganges; kari' - having taken; pūjā - worship; karite - to do; lāgilā - began; kanyā-gaṇa - the girls; madhye - in the midst of; prabhu - the Lord; āsiyā - coming there; basilā - sat down.

When the girls engaged in worshiping the different demigods after bathing in the Ganges, the young Lord would come there and sit down among them.