Rumia decollate is a predatory snail, imported from North Africa, and naturalized here in Texas.  It grows to 2 ½ “, has a long conical shell and feeds on the round-shelled garden snail.  It burrows into the soil in hot and cold weather and prefers to feed on snail eggs and small hatchlings.  The decollate snail seems to do very little damage to crops unless plants are stressed and showing signs of decay and death.  Decollates will feed on some low growing plants and germinating seeds, but they prefer dead plant material.  Some people fear the release of non-native species, but they are already here.