638 S. W. WILLISTON 
gently concave and turned outward, and, posteriorly, a little down- 
ward, forming the lateral margin of the flat table of the skull. The 
natural character of the border is beyond dispute, the small pittings 
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Fic. 1.—Trematops milleri Will. Dorsal view of skull; three-fifths natural size. 
of the surface continuing quite to the junction of the upper with the 
lower surface of the cranial bones. ‘There is no possibility of its union, 
either by suture or fracture, with the lateral walls of the skull. In 
front the vacuity continues in a shallow, lateral groove, nearly as far 
