 They may have bidentate tips as in some spp of "Natrix".Some snakes, such as the Short Seasnake "Lapemis curtus", may have spinelike and juxtaposed scales while others may have large and non-overlapping knobs as in the case of the Javan Mudsnake "Xenodermis javanicus".Another example of differentiation of snake scales is a transparent scale called the "brille" or "spectacle" which covers the eye of the snake.