iDENTIFICATION

[paul monfils]

Picture 1, left, is Semicassis centiquadrata  (Valenciennes, 1832)
http://www.conchology.be/?t=66&family=CA...tiquadrata

Picture 2, left, is an immature Melongena patula (Broderip & Sowerby, 1829)
http://www.gastropods.com/1/Shell_1111.shtml
Both of these are from West Central America.

Picture 3 is an Astraea, in the family Turbinidae.  The thick fibrous periostracum hides much of the shell detail, but I think it may be an immature Megastraea undosa (Wood, 1828), which occurs from southern California to outer Baja California.
http://www.gastropods.com/2/Shell_292.shtml
http://www.conchology.be/?t=68&u=272060&...acf580f08a

Pictures 5 and 6 show a Carrier Shell, Xenophora.  Carrier shells can often be identified by the kinds of other shells they have attached to themselves.  However, this carrier is just covered with small hard to identify bivalves (probably Cardita species), many of which are worn and/or encrusted, so unless you have some idea where this shell was collected, I cannot identify the species with any certainty.

The other two shells (#1 right and #2 right) have been identified by the poster above (Bence Cs.)  These are both Indo-Pacific species.