Pagoda snails (Brotia pagodula) also known as Spiny River Snails, have a unique appearance and considered more attractive and desirable among aquarium enthusiasts than most of your freshwater snails. 

They like to burrow themselves in the substrate and not be seen for a period of time but if tank conditions are ideal they'll show themselves frequently. 

Average adult size 1-2 inches

Purchase size 1/2- 1 inch

Recommended Temperature of 73-84 F and PH of 7-8