Need ID for some shells from Malaysia

[dave r]

Hi Mike, this is as much as I can identify.
Top row #1. Trochus sp. ? maculatus Linne. 1758
       #2. Thais blandfordi (Melvill 1893)
       #3. Cerithium columna Sowerby 1834
Middle row. #1.Thais sacellum (Born 1778)
           #2. Morula granulata (Duclos 1832)
           #3. ? juvenile Cronia margariticola (Broderip 1833)
           #4. Cymatium (Monoplex) aquatile (Reeve 1844)
Bottom row. #1. Pythia sp. (a pulmonate)
           #2. unknown
           #3. ? Coralliophilidae
           #4 juvenila Conus glans Hwass 1792
Sorry I can't do any beter but some specimens are worn and others look to be juveniles. A better, brighter shot of the Trochus  would be helpful.
Dave