R help - Jul 2012 - [deldir] map original index of coords to describe triangles

My data:
> head(cbind(x,y,z))
x y z
[1,] -78.1444 -60.4424 -10.09
[2,] -78.1444 -58.4424 -10.26
[3,] -78.1444 -56.4424 -10.45
[4,] -78.1444 -54.4424 -10.64
[5,] -76.1444 -60.4424 -10.19
[6,] -76.1444 -58.4424 -10.34
> tris <- deldir(x, y)
> triangs <- triang.list(tris)
> head(tris$delsgs)
x1 y1 x2 y2 ind1 ind2
1 -78.1444 -58.4424 -78.1444 -60.4424 2 1
2 -78.1444 -56.4424 -78.1444 -58.4424 3 2
3 -78.1444 -54.4424 -78.1444 -56.4424 4 3
4 -76.1444 -60.4424 -78.1444 -60.4424 5 1
5 -76.1444 -60.4424 -78.1444 -58.4424 5 2
6 -76.1444 -58.4424 -78.1444 -58.4424 6 2
> head(triangs)
[[1]]
x y
1 -78.1444 -60.4424
2 -76.1444 -60.4424
3 -78.1444 -58.4424

[[2]]
x y
1 -78.1444 -60.4424
2 -70.1444 -62.4424
3 -76.1444 -60.4424

[[3]]
x y
1 -78.1444 -60.4424
2 -64.1444 -64.4424
3 -70.1444 -62.4424

[[4]]
x y
1 -78.1444 -60.4424
2 -58.1444 -66.4424
3 -64.1444 -64.4424

[[5]]
x y
1 -78.1444 -60.4424
2 -52.1444 -68.4424
3 -58.1444 -66.4424

[[6]]
x y
1 -78.1444 -60.4424
2 -24.1444 -78.4424
3 -52.1444 -68.4424

Question: How do I get a list of the positions of the coords in triangs
instead of the real coords?

I.e., instead of the real coords provided to deldir() I would need the
positions of the coords which form a triangle:
x y
1 -78.1444 -60.4424
2 -76.1444 -60.4424
3 -78.1444 -58.4424

Triangle: coord1 coord2 coord3

Thanks!

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