Dermophis mexicanus.  These limbless amphibians belong to the group Gymnophiona, otherwise known as caecilians.

Caecilians are characterized by having the eyes greatly reduced or completely absent, a limbless body with annuli and a fossorial or aquatic lifestyle.
Other characteristics regarding these curious amphibians can be revealed by visiting www.gymnophiona.org

This specimen was found in the Cordillera Nombre de Dios in Atlantida and photographed by Eric N. Smithxt.