Four Olividae sp.

[diocrisseashells1000]

Hello collectors,
Here are 4 olive species from Philippine island,unfortunately i am confused on how to id it, any help will much appreciated.

1&2 are found in depths of 6-10 ft. white sandy bottom
1.      46mm.
2.    19mm.
3&4 are a beach specimen.
3.    30mm.
4.    24mm.

thanks
Diocris.