Rare Large Sea Shells from the Bahamas. Natural History Specimens Bundle. The 5 Pink Conch Shells were collected without the usual hole piercing to extract the animal inside. Sizes range from 10 inches length and 8 inches wide. The fossilized White Head is a Grand Mother. The Brown Bonnet Shell rarely grows more than 5 inches…This one is 10 long and 8 inches wide. Beautiful Bundle for the Coastal Decorator.