Nassarius breeding?

[morphiii]

I just added 50 of these guys in a new tank I am setting up.

Saw some of them depositing white packet, like eggs on the glass.

Does anyone know what they are?

http://i148.photobucket.com/albums/s29/morphiii/IMG_1616.jpg

http://i148.photobucket.com/albums/s29/morphiii/IMG_1617.jpg

http://i148.photobucket.com/albums/s29/morphiii/IMG_1618.jpg

http://i148.photobucket.com/albums/s29/morphiii/IMG_1620.jpg

http://i148.photobucket.com/albums/s29/morphiii/IMG_1619.jpg