No it is not seedless this is one of the autumn fruiting raspberries. I am not aware of a seedless raspberry - the fruits are the seed containers.

R. idaeus is the species. They grow wild in many parts of the country here. There probably is a seedless form, the geneticists are full on with this sort of program.

http://davesgarden.com/community/forums/t/590996/
There is a thread on here re seedless raspberries but you have to register as a member of the forum before you can look at it.

I can't imagine a raspberry without seeds - must be pretty odd!

None of my Autumn Bliss raspberries have seeds - just pure sweet flesh, year after year.