EDENTATA OF THE SANTA CRUZ BEDS. 45 



in Dasypus, forming more concave orbits. The forehead is broad and 

 lozenge-shaped, with two prominences formed by the frontal sinuses and 

 a broad depression between them. Nasals and premaxillaries have been 

 lost. 



The maxillary is very elongate and high in front of the orbit, where the 

 lateral surface curves into the dorsal without any such angulation as occurs 

 in Dasypus ; the infraorbital foramen is more elevated than in the latter. 

 The palatine processes are long and narrow, widening somewhat posteri- 

 orly and are nearly plane. The palatines are quite large and form a con- 

 siderable part of the hard palate, but they are not continued so far behind 

 the teeth as in the recent genus ; in this region the palate is quite concave. 

 The posterior nares are large, emarginating the palate more deeply than 

 in Dasypus, and have a lanceolate anterior border. 



The mandible has an elongate horizontal ramus, of no great vertical 

 depth, but thick and rounded externally ; the symphysis is lost, but from 

 what remains, it would seem that this region was laterally compressed and 

 but little tapered. The ascending ramus has a more posterior position 

 than in Dasypus, not concealing the last tooth, as it does in the latter. 

 This ramus is high, but not very broad and its ventral border is raised 

 well above that of the horizontal ramus, producing a marked constriction 

 at the junction of the two. No angular process is formed and the angle 

 is broad and gently rounded, much like that of Dasypus, but not extend- 

 ing so far behind the condyle ; the masseteric fossa has an elevated and 

 anterior position and is quite well defined. The coronoid process is high, 

 narrow, erect and not at all recurved, ending in a bluntly rounded tip ; the 

 linea obliqua externa passes over upon the outer side of the coronoid near 

 its upper end and forms a smooth, raised area. The condyle is almost 

 sessile, not set upon a long neck, as it is in Dasypiis, but resembles that 

 of the latter in shape ; the sigmoid notch is shallow. 



The hyoid apparatus is, in some respects, peculiar, but is not unlike 

 that of Dasypus. As in the latter, the anterior cornu consists of only two 

 elements, but the proportions are different, the proximal piece being longer 

 and the distal much shorter. The former is stout, compressed and plate- 

 like above, contracted and nearly cylindrical at the distal end. The second 

 element, probably the cerato-hyal, is a very short, subcylindrical bone, 

 articulating loosely with the basi-hyal, which is broad in both directions 

 and larger than in the modern genus, and gives off a short median, pos- 



