Beneath the naris the maxilla extends as a broad tapering shelf, the ventral surface of which articulates with the premaxilla.
At the posteroventral corner of the naris a foramen opens onto the lateral surface of the maxilla.
The posterior edge is slightly concave and in part forms the anterior border of the naris.
The nasal is triangular and, with the lacrimal, forms the medial border of the naris.
Tantilla gracilis usually has a single nasal that is divided below the naris; variation in this characteristic is discussed above.