Agree it is Y. baldus.
Normally if you draw a line thru the centres of spot 2 & 3 & likewise thru spots 5 & 6, the lines intersect at a greater (wider) angle ( on the inside or basad) in horsfieldii.
However there are a lot of variations & perspective distortion in photos make it hard to see. Y. baldus. http://1.bp.blogspot.com/-DN5O-c2TqL...Anthony_01.jpg Y. horsfieldii. http://4.bp.blogspot.com/-pGbWG_SUEv...-Five-Ring.jpg