Nerita tessellata:

Checkered Nerite. Diameter 1/2-3/4 inches; height about the same. 4 or 5 whirls are separated by indistinct sutures. The surface is sculpted with some 12 rounded spiral ribs on each volution; with deep narrow grooves in between. Numerous small teeth can be found on columellar margin. Colour checkered black and white. This is a shallow water organism; found along north and south shores with N. peloronta.