This is a particulary nasty creature which latches onto the male species until insemination is complete. Once done she kills the male and stores him deep inside her body, beneath the earth. Once the little ones hatch she regurgitates the father for them to eat.
The image was from the manhole lid shown below. It was duplicated, rotated, and sized until I had about 15 copies sitting on top of one another. I then painted this object to create depth. Eggs, leaves, and teeth were all painted. One image I shot of a slug was overlayed and brushed in to create the wet look.