104 G. E. Wieland — On Marine Turtles. 



Protostega Copei sp. nov. (Figures L-4). 



A new species, which may be appropriately named for the 

 illustrious discoverer of the Protostegidae, is indicated by the 

 most complete and best conserved specimen referable to its 

 family, thus far obtained. This splendid fossil is from the 

 Niobrara chalk of the Hackberry Creek Valley, Gove county, 

 Kansas, and was found in the summer of 1905, by the veteran 

 collector and explorer, Mr. Charles H. Sternberg. 



Fig. 1. 



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Figure I.— Protostega Copei. Photograph of skull and lower jaw of type 

 as mounted in the Yale University Museum by bringing together the disso- 

 ciated and for the greater part but little crushed cranial elements. One- 

 fourth the natural size. 



Only minor portions of certain boundaries had to be restored. A little 

 attention will at once reveal the limiting sutures of the premaxillary, max- 

 illary, frontal, post-frontal, parietal, jugal, post-frontal and squamosal. 

 Only the boundaries of the quadrato-jugal are generalized. The premax- 

 illary is a little crushed to the left, and the most striking feature is the 

 low-set position of the squamosal, which is but little if at all exaggerated. 

 Cf. figure 6. 



Not only is the present type one of the most complete of 

 fossil turtles, but more than any other known specimen of 

 jRrotostega, it permits exact comparison with Archelon, being 

 for the most part free from the crushing which so often 

 obscures the characters of the otherwise line material from the 



