114 



THE CERATOPSIA. 



A comparison of the vertebra still preserved with others from the same region in the 

 vertebral column, but belonging to the skeleton of a large carnivorous dinosaur, probably per- 

 taining to some species of Dryptosaurus, from the Laramie of Converse County, Wyo., and now 

 in the collections of the Carnegie Museum, demonstrates conclusively that the remains upon 

 which the present genus and species were based belonged to the Theropoda rather than the 

 Predentata, and that it was therefore not a member of the Ceratopsidse. Its likeness to the 

 carnivorous genus Dryptosaurus is seen in the general form of the dorsal centrum, the coarsely 

 cancellated internal structure of the bone, and the deep fossa on the superior lateral surface 

 of the centrum. The similarity of structure shown by the type and a vertebra from the 

 Carnegie Museum skeleton is remarkable, and I may remark in this connection that there can be 

 no doubt that the latter pertained to a member of the Theropoda, since it was found associated 

 with the skull and a considerable portion of the skeleton. The present genus and species is 

 therefore not a member of the Ceratopsidse and needs no further consideration in this connection. 



CLAORHYNCHUS Cope, 1892. 



Type species, C. trihedrus. 



Original description in Am. Naturalist, vol. 

 26, 1892, pp. 757-758. 

 Osborn, H. F., Contr. Canadian Pal., vol. 3 



(quarto), pt. 2, 1902, p'p. 19, 20. 



The genus and the species were 

 founded on a rostral and predentary 

 bone, neither of which I have been 

 able to discover in the Cope collec- 

 tions. No locality or definite hori- 

 zon other than Laramie was given 

 b}^ Cope. It was presumably from 

 South Dakota. Cope's original de- 

 scription is as follows: 



Fig. 105.— Vertebral centrum ot Manospondylus gigas Cope, type, No. 3982, American 

 Museum of Natural History. One-fourth natural size. 



Claorhynchus tkihedrus Cope. 1S92. 



Type (No. 397S, American Museum of Natural History) consists of a rostral and a predentary. 



Original description in Am. Naturalist, vol. 26, 1892, pp. 757-75S. 

 Osborn, H. F., Contr. Canadian Pal., vol. 3, pt. 2, 1902, p. 15. 



Char. gen. — This genus is established on a rostral and predentary bones of a species of the Agathauniidse, which were 

 found together and with the fragments of a massive supratemporal bone. They are distinguished by their absolutely flat 

 inferior faces, there being no alveolar ridges as in the forms described by Marsh. They are not compressed but are as wide 

 as long. They are not adapted to the muzzle of Monoclonius, where the rostral bone is compressed (M. sphenocerus) . 



Char, specif. — Rostral and predentary bones as wide as long, with flat inferior face and rounded superior median angle. 

 Transverse diameter rather exceeding the vertical. Sides convex. All the surfaces furrowed by coarse grooves which termi- 

 nate in foramina. 



The short, wide form of this species differs from that seen in the species of the family Agathauniidse which have been, 

 yet described. The extremity of the beak had apparently a horny sheath and was adapted for crushing comparatively hard 

 substances. 



The comparative dimensions of the rostral and predentary bones given by Cope suggested 

 to me that Professor Cope had mistaken the exact homology of the former element and that 

 these bones may have pertained to a member of the Trachodontidse, and in a recent paper on 

 the genera and species of that family I have included the present genus and species in the 

 Trachodontidse, " In the absence of the type material for direct comparison it is impossible 

 to determine the affinities of the present genus and species with certainty. 6 If, however, as 

 Professor Cope states, they are without alveolar ridges, have absolutely flat inferior faces, and 

 are as wide as long, they would seem, unless these characters are due to crushing, to pertain to 

 a member of the Trachodontidse rather than the Ceratopsidse. 



a Annals Carnegie Mus., vol. 1, pp. 377-386. 



& The type has recently been identified by Dr. Matthew.— R. S. L. 



