21. One of these is a large triangular antorbital fenestra in the side of the snout. 22. The antorbital fenestra houses a paranasal sinus that is confluent with the adjacent nasal capsule. 23. Like many other basal parareptiles, " Microleter " has a temporal fenestra . 24. Synapsids have a single hole ( temporal fenestra ) low on each side of the skull. 25. In the lower jaw, the external mandibular fenestra is rather small for a basal tetanuran. 26. The external mandibular fenestra is large. 27. The mandibular fenestra was large and was located at the front part of the lower jaw. 28. The external mandibular fenestra , present in prosauropods and some basal sauropods, is entirely closed. 29. The teeth are located entirely anterior to the antorbital fenestra and the snout is especially broad. 30. The subsquamosal fenestra , an opening in the posterior part of the skull, is relatively small. 