I've got some feedback from Rod Bucknel about the listing of the
angas in the Tibetan version of the Mahasunnata Sutta (recently
published by Peter Skilling through PTS as part of a group called
the 'Mahasutras'). Apparently this belongs to the Mulasarvastivada
school.
As was mentioned before, both the Pali and Chinese versions of this
sutta list just three angas (sutta, geyya, vyakarana), rather than
the usual list of 9 or 12. This was used by Yin Shune as a key piece
of evidence in support of the Yogacarabhumisastra that the earliest
collection of Buddhist scriptures consisted of just these three
sections, which are today largely found in the Samyutta.
It is very lucky that we are able to compare such an important point
with a Tibetan version, for there are sadly few early suttas in
Tibetan translation - a little more than a dozen, some of which are
very minor. One Tibetan version of the Dhammacakkappavattana Sutta
even seems to be a translation from the Pali version, so it gives us
no independent testimony.
Anyway, Rod says: 'Further on the angas in Mahasunnata sutta. The
list as it actually appears in the Tibetan sutra is at Skilling vol
I, pp 242-244. Most of the 12 Tibetan terms are absent from Das¡¦s
Tibetan-English Dictionary, but I managed to work them out as:
sutra, geya, vyakarana, gatha, udana, nidana, avadana, itivuttaka,
jataka, vaipulya, adbhutadharma, upadesa.'
So here we have just the usual 12 angas, and as Skilling says, this
suggests that here the Mula-sarv tradition represents a more
developed phase than the Theravada and the Sarvastivada (in Chinese).
So, Stephen, this saves you a bit of hunting around!