152 



eleven. The crowns iirt- incurved, t'acctcd externally, aiul striate ymoverl 

 internally; there are cutting-edges in front and rear, both strongest near the 

 apex ; the anterior continued to the base.the posterior wanting on the basal third 

 on the median maxillaries. The anterior nareal excavation marks the fourth 

 tooth from the premaxillary suture. The premnxillary hone is remarkable for 

 its shortness and flatness at the extremity ; tins part being depressed and 

 scarcely projecting at the lower margin in front of the anterior teeth. These, 

 as nsual, number four. 



Both quadrate hones are preserved nearly entire. They have the same 

 general character as those of PL ictericus and Fl. coryphcBus ; reseml)ling rather 

 the ktter in the great length of the posterior hook, which is without posterior 

 marginal button. The proximal internal angle is large and obtuse, and is 

 continued into a prominent thick ridge. The latter divides below, the thick 

 extremity turning outward and ceasing ; an acute ridge continuing inward, and 

 joining the interior acute extremity of the distal articular surface. The sub- 

 nieatal knob is broad and thick, and not prominent; and its extremity turns at 

 an acute angle forward on the outer face, and forms the commencement 

 of the great ala. The articular surface is straight crescentic, with an expan- 

 sion on a tuberosity on the inner face (concave of crescent). The meatal pit 

 is sunk between the ridges surrounding, one of which is on the outer margin 

 of the posterior hook. 



The mandihle is nearly perfect. The dentary bone bears thirteen teeth, 



and, at the extremity, is contracted in both directions, and not prolonged beyond 



the base of the last tooth. The ridge, which descends from the cotylus along 



the inner face of the articular bone, is not nearly so strong as in the P. 



mudgei. 



Measurements. 



M. 



Length of tbe axis with tbc odontoid 0.06'i 



Elevation of the neural spine of the odontoid at the middle 0. 04(i 



Lenj^th of the third cervical (body) 0. OoO 



Diameter of the ball, vertical 0. 0i5 



Diameter of tbe ball, horizontal 0. UlJ'i 



Length of a posterior dorsal 0. Oii.'i 



Diameter of the ball, vertical 0. Uod 



Diameter of the ball, horizontal 0. (•.')() 



Length of tbe basis cranii 0. U'JO 



Length of the suspensorium 0. 105 



Elevation cf the occipital crest above the floor of the foramen magnum 0. (i 15 



Length of the tooth-lino of the palatine 0. 115 



Length of the maxillary bone U. LIU 



Length of the preniaxilUiry laterally O.0;l5 



