I cannot say Hans is mistaken. However, the lotus seeds I have seen are more spherical. JDA.
Sorry, I should have added this to my original post. The seeds are hollow and measure 10 mm x 16 mm. They are slightly shiny and most of them have a 3-5 mm dull patch on one end. Within this patch is a small spot (about 1 mm). I'll add a couple more pictures where this is clearer. They look very much like the lotus seeds in the picture hans posted just brown instead of green.
see the pictures of Nelumbo nucifera seeds in
http://www.botanicalbeads.com/BBB_page_43.html
also one I found on line.