Shell Identification

[paul monfils]

Hi,
There is really nothing rare or unusual here.  They are all very common species.  Also, most of them are not of sufficient quality to interest a serious collector, even if they were uncommon. Collectors tend to be picky that way, whether they collect stamps, coins, shells, or whatever.  If these were in perfect condition, the prices would range from about $2.00 to $5.00.  Just in case you might be interested, here's a quick survey of what you have (numbering consecutively across the top row, then middle row, then bottom row):
1. Turritella or Turret Shell, may be Turritella leucostoma (white-mouth turret shell) from West Central America
2. Astraea undosa, wavy turban shell, California to Baja California
3. Phalium bisulcatum, Japanese Bonnet Shell, Western Pacific
4. Echinarachnius parma, Eastern Sand Dollar, Eastern USA
5. Cypraea spadicea, Chestnut Cowrie, California to Baja California
6. Strongylocentrotus droehbachiensis, Green Sea Urchin, North Atlantic
7. Bufonaria rana, Frog Shell, Western Pacific
8. Oliva sayana, Lettered Olive Shell, SE United States
9. Same as #4
10. Hexaplex (Murex) nigritus, Black Murex, Gulf of California
11,12. Strombus turturella, Western Pacific
13,14,15. Polinices, Moon Snails.  #13 and 15 are Polinices duplicatus, the Shark-Eye Moon Snail, Eastern USA
#15 may be a different species of moon snail, or the same one.  Would need to see the underside to be sure.
Cheers!