The big shell is a Vasum muricatum, unless it's a low-spined variant of Vasum cassiforme.
The other is a cowry, of course, but juveniles are often difficult to ID. It would have helped a lot if you had mentioned where it originated. Assuming it's from the same place as the Vasum, it's either Macrocypraea zebra or M. cervus, or a hybrid of the two.
Cheers,
Don