Tessellate Nerite: Nerita tessellata: It has heavy spiral cords and black mottlings on an off white background, at times appearing more black than white - The aperature is a bluish white with two very small weak teeth on the inner margin and very weak bumps on the inside of the lip. (AmbergrisCaye.com)
If you already have cavities or weak teeth or you don't consume dairy regularly, you may want to consider taking a High Vitamin Butter Oil supplement which can provide concentrated quantities of K2. (wellnessmama.com)