414 J. B. Hatcher — Two New Ceratopsia. 



plete series of presacral vertebrae, together with a number of 

 ribs more or less complete, and portions of the pelvis, includ- 

 ing a portion of the right ilium and a nearly complete pubis. 

 The vertebral series lay in position with the vertebrae inter- 

 locked by their zygapophyses from the axis to the last dorsal, 

 though portions of some of the vertebrae had weathered away 

 when found. Behind the posterior dorsal, impressions of the 

 centra of the first two sacrals were preserved in the hard sand- 

 stone in which the skeleton was imbedded. 



Locality. — The skeleton was discovered by Mr. W. H. 

 Utterback, and the exact locality was some three miles above 

 the mouth of Lightning Creek and about one and a half miles 

 south of that stream, in Converse County, Wyoming. The 

 horizon was near the summit of the Laramie, and the specimen 

 was collected by the present writer assisted by Messrs. W. H. 

 Utterback, A. L. Sullins, and T. A. Bostwick. When dis- 

 covered the skeleton lay imbedded in a hard sandstone concre- 

 tion and was much shattered and weathered about the pelvic 

 region. None of the limb bones and no part of the tail were 

 recovered. 



The Skull, 



The extremely rugose nature of the skull together with the 

 closed condition of the sutures, many of which are almost or 

 entirely obliterated, make it certain that the type of the present 

 species pertained to an old individual. 



The Cranium. — The chief distinctive features of the cranium 

 are as follows : The supraorbital horn cores are unusually short 

 and stout, especially at the base. They are less compressed 

 and more nearly circular in cross-section than in most other 

 species. The nasal horn is short and very stout with the antero- 

 posterior diameter much exceeding the transverse. Its anterior 

 border is directed upward in a line perpendicular with the 

 longer axis of the skull instead of forward and upward at an 

 angle of about thirty degrees to that axis as "in the type of 

 T. prorsus. The lachrymal foramen, as in T. serratus, lies 

 between the maxillary and the nasal, but in the present species 

 its anterior half is entirely enclosed by the maxillary, that bone 

 sending upward a short process alongside the premaxillary 

 process and forming the anterior one-half of the superior 

 border of the foramen. The orbit is elliptical in outline with 

 the longer diameter inclined backward from the perpendicular 

 at an angle of about ten degrees. The lateral temporal 

 fossa is triangular in outline, its respective borders describing 

 nearly an equilateral triangle, the fore and aft diameter only 

 slightly exceeding the vertical. The rostral bone is heavy 

 and very deeply excavated beneath. The epijugal is rather 



