126 



Field Columbian Museum — Geology, Vol. II. 



Fig. i. Mandible of Nyctosaurus gracilis, x %. i, from above; 2, from below. 



MEASUREMENTS OF MANDIBLE. 



mm. 



Length, as preserved - l6 ° 



Lengths of rami to hind margin of floor 78 



Width between condyles 39 



HYOIDS. 

 Two slender, cylindrical, gently curved bones, about thirty millime- 

 ters in length, were found lying side by side beneath the anterior part of 

 the skull. They are sufficiently well shown in Plate I of the paper cited 

 in the Journal of Geology. Lying near the occiput in the same plate, is 

 seen a small, triangular, or V-shaped bone which I then thought might be 



