Меня интересует, последняя часть предложения после скобок.

"and not by the conditions of allotment thereof made payable at fixed times"

Контекст такой:
The directors may from time to time make calls upon the members in respect of any moneys unpaid on their shares (whether on account of the nominal value of the shares or by way of premium) and not by the conditions of allotment thereof made payable at fixed times,

Спасибо большое, если кто-нибудь поможет!