138 THE CERATOP&IA. 



element in most other species. It appears to be intermediate in character between that of the 



type of the present species and the nasal horn core of the type of Triceratops calicomis, a nearly 



related if not identical species. 



Measurements of the coiype [plesiolype]. 



Mm. 



Length of dentaiy from base of coronoid to predentary 560 



Greatest depth of dentary - 180 



Greatest length of surangular 213 



Greatest antero-posterior diameter of coronoid. . 70 



Antero-posterior diameter of nasal horn core at base 145 



Transverse, diameter of nasal horn core at base - - - 110 



Length of nasal horn core. , - - 140 



Diameter of occipital condyle 99 



Triceratops calicornis Marsh. 1898 



Type (No. 492S, U. S. National Museum) consists of skull and portion of skeleton from Laramie beds of Converse County, 

 Wyo. 



Original description in Am. Jour. Sci., 4th ser., vol. 6, July, 1898, p. 92. 

 Nopcsa, F. Baron, Foldtani Kozlony, Budapest, 1901, vol. 31, p. 271. 

 Osborn, H. F., Contr. Canadian Pal., vol. 3 (quarto), pt. 2, 1902, p. 14. 

 Walco'tt, C. D., Science, new ser., vol. 11, 1900, p. 23 (T. californis). 



LOCALITY. 



The type (No. 4928, U. S. National Museum) of this species was found by the writer about 

 1 mile nearly due south of the locality which yielded the skeleton (No. 4842, U. S. National 

 Museum) referred by Marsh to T. prorsus. The location is shown in PI. LI at +29. When 

 found, the skull lay embedded with a considerable portion of the skeleton in a stratum of rather 

 hard sandstone, from which the frill, as well as a considerable number of the bones of the skele- 

 ton, protruded, and had already suffered much from weathering. On the whole, however, it is 

 fairly complete, and it is possible to determine many of the most important of the cranial and 

 other skeletal features of this supposedly new species from the type specimen alone. 



ORIGINAL DESCRIPTION. 



Professor Marsh's original description of this species was as follows: 



One of these, which may be called Triceratops calicornis, is of special importance, as not only the skull, but the greater 

 part of the skeleton of the animal, is in good preservation, forming one of the most instructive specimens now known of this 

 group of extinct reptiles. The skull, as a whole, shows the well-marked features of the genus Triceratops. A specific char- 

 acter is seen in the nasal horn core, which is in perfect preservation. It is directed well forward, and, unlike any hitherto 

 described, is concave above, which fact has suggested the specific name. The upper or posterior surface of this horn core 

 somewhat resembles the bottom of a horse's hoof. 



Some of the principal dimensions of this skull are as follows: Length from front of beak to back of parietal crest, about 

 6 feet 5 inches; from front of beak to end of occipital condyle, 3 feet 5 inches; distance from occipital condyle to back of 

 parietal crest, 4 feet; from front of beak to point of nasal horn core, 23 inches; height of postfrontal horn core, 29J inches, 

 and antero-posterior diameter of same horn core at base, 12 inches. 



The type (No. 4928, U. S. National Museum) of the present species consists of a skull 

 with lower jaw, eleven dorsal vertebrae, several ribs, a considerable portion of the pelvis and 

 sacrum, and other portions of the skeleton. The material constituting the type has been very 

 much neglected since its arrival at the U. S. National Museum, and some of it is no longer 

 available. Of the lower jaw, only the predentary and a small portion of the anterior part of 

 the left dentary remain, while a considerable portion of the frill of the skull has been lost. 



DESCRIPTION OF TYPE. 



The skull. — The skull pertaining to the type of the present species is very similar to that 

 which forms the type of T. elatus (No. 1201, U. S. National Museum). Most of the characters 

 seen in that skull which might be considered of specific importance are shown also in the type 

 of the present species, though somewhat more emphasized. This is especially true of the nasal 



