FROM THE PHOSPHATE BEDS OF SOUTH CAROLINA. 223 



The supra-vomeriue canal is cylindroid, slightly compressed laterally, and is 

 about five-eighths of an inch in vertical diameter and half an inch transversely. 



The conjoined intermaxillaries, where they cover the supra-vomerine canal, form 

 an acute ridge expanding posteriorly in a long narrow triangular elevation with an 

 irregularly rounded base bent unsymmetrically towards the left, and producing a 

 central prominence to the prenarial or interorbital region. From the fore part of 

 the intermaxillary eminence the sides of the rostrum slope forward and outward 

 nearly evenly to the lateral borders of the beak. From the posterior expanded 

 extremity of the intermaxillary eminence a groove extends to the nasal orifices, 

 separating the prenarial fossee. These have the same form as in C. trachops, and 

 in the same manner converge forward into grooves extending along the beak, but 

 in the fossil under consideration the grooves unite across the acute fore part of the 

 intermaxillary ridge, about eight inches in advance of the nares. The grooves in 

 their course, as in C. trachops, communicate with a large foramen continuous with 

 a canal extending into the intermaxillary bone. The right prenarial fossa is larger 

 and deeper than the left one, being about three and a quarter inches wide, while 

 the latter is about two inches wide. The groove from the left fossa is partially 

 overhung by the expanded base of the intermaxillary eminence. 



Outside of the position of the prenarial fossse the supra-frontal expansions of 

 the maxillaries present another pair of deep curved fossse, which converge forward 

 and disappear upon the sloping sides of the beak. The left supra-orbital fossa is 

 both deeper and wider than the right one. In front and behind, a pair of strongly 

 marked vascular grooves, curving outwardly in opposite directions, communicate 

 by a pair of foramina from the supra-orbital fossa, internally with the infra-orbital 

 canal. Externally the supra- orbital fossae are bounded by thick arched elevations 

 of the maxillaries. The left supra-orbital eminence is conspicuously larger than 

 the right one. The anterior orbital notches are wide, but shallow. 



The lateral subacute border of the rostrum continues undivided to the anterior 

 broken end of the beak. Near the middle of its course a vasculo-neural canal 

 opens into a groove proceeding forward. On the left side, the lateral border of the 

 rostrum bifurcates in advance of its middle into a pair of branches which extend 

 forward widely separated. A vasculo-neural canal corresponding with that just 

 mentioned, opens in the crotch of the dividing border. 



The under part of the rostrum resembles in its construction the same part in 

 C. trachops, but proportionately is more expanded posteriorly. From the posterior 

 carina, separating the palatine articulating surfaces, a slight median ridge or line 

 advances on the beak and disappears. No other mark than this line exists indi- 

 cating the original separation of the maxillaries. 



