NO. 2260. tJEW RESTORATION OF TRICERAT0P8—GILM0RE. 



107 



see F^ figure 1, and extending back to the pineal foramen, see pirij 

 figure 1. In the great thickening of the bone and its relationship to 

 the brain and underlying structure, it closely resembles the frontal 

 of Diplodocus longus Marsh as shown in figure 5, Fr. In specimen 

 No. 5740, U.S.N.M., the sutures are almost entirely obliterated, but 



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in a second brain case of Triceratops serratus Marsh (No. 2416, 

 U.S.N.M., see figs. 2 and 3) the olfactory lobe is entirely inclosed 

 by what Hay regarded, and I believe correctly, to be the united 

 orbitosphenoids. Such a condition is unusual, for in no other rep- 

 tile living or extinct have I observed these bones thus inclosing this 

 part of the brain. Usually the frontal forms the median upper 

 boundary and I presume such a condition will be found to prevail 



