They are not forms in the sense you are thinking of......They are movement patterns of attack and defense. Because of the lack of equipment movements were grouped together in simple ways.
I posted some info on the new muay boran DVDs which breakdown the theories and principles and the second one goes through these techniques in sequences which are drilled in two man movement. try:
www.ancientmuay.com and
www.bareknucklemuay.com
The upcoming books by Vincent Giordano which are cross cultural studies of the bare knuckle fighting arts should answer most questions about the exact systems and movements.
Shaolin Bushido:
On the other thread you asked for a teacher on the east coast fully versed in Muay Boran, Muay Thai, lerd rit and several styles of KK, and it would be best to seek out Vincent Giordano, his knowledge and skills are truly exceptional and since he is a intrepid researcher you will get more than you bargained for all the way down the line.