It is also of course the case that various priests have historically had the power to ordain to various grades. Boniface VIII allowed the Abbot of London's Augustinian Monastery to ordain his subjects as priests (albeit this was soon revoked wanted to reserve this power to himself). Martin V allowed some abbots in Saxony to ordain and Innocnet VIII allowed certain cistercian abbots to ordain, something contained in their rituals right up the the 20th century (although the practice, I believe, had fallen out of use a long time previously).This is certainly true, though I understand that this information has only relatively recently become known. I read some time ago that Cardinal Ottaviani, at the council, wishing to oppose the making of a distinction of kind between Episcopacy and Presbyterate, had commented 'if only we could find one single case of presbyteral ordination, we could finish this attempt off for good'. And yet the matter had been known to, at least, the eminent liturgiologist and doorkeeper of Archbishop's House, Westminster, Archdale King.
I've tried hunting around the documents of Vatican II for where this matter is dealt with, but no luck yet. — update: see the comments box.