4 KANSAS UNIVERSITY QUARTERLY. 



region, flattened. The sagittal crest is large, but not nearly so large 

 as it is figured by Marsh, the restored outline of whose figure is un- 

 doubtedly wrong. The texture of the bone forming the crest is 

 materially different from ihat of the remaining bones of the skull. 

 The bone is more roughened, and less firm. There is a well-developed 

 ring of sclerotic ossifications. In the specimen figured, the separate 

 plates measure from six to eight millimeters in diameter. They were 

 not imbricated, as in the Pythonomorpha, but have a similar dense 

 texture. There is a superior temporal arch, bridging over a small 

 opening leading downward to the inferior temporal fossa. The fol- 

 lowing measurements will give the principal dimensions of this 

 specimen. 



Length from tip of premaxillary to occipital condyle . . 680 millim. 



Extreme length of skull 780 



Extent of crest beyond orbit 145 



Greatest diameter of orbit 65 



Antero-posterior diameter of nasal opening 135 



Length of quadrate 120 



Width of lower jaw at articulation 22 



Pubis. 



In a previous paper on the anatomy of Pteranodou,'^ I stated that I 

 had never seen the so-called "prepubic bones." Since that time, how- 

 ever, an excellent specimen of them has been discovered among our 

 material. The specimen of which they are a part consists of the larger 

 portion of the skeleton, and is perhaps conspecific with the one to 

 which the described pelvis belongs. The figure given herewith will 

 convey a good idea of their shape. The bones of the two sides are 

 firmly co-ossified, and have been pressed nearly flat; the figure repre- 



(L 



FIG. I. 



*Amei'. Naturalist, Uec. 1891, p. 1124. In this article the descripfiou of the 

 foot-phalanges should read: "All are slender, excejit tlie second one in the third 

 toe, and tlie second and third in the firmlli toe, wiiere they are scarcely longer 

 than wide." 



