EDENTATA OF THE SANTA CRUZ BEDS. 185 



the first tooth has been suppressed. The dorsal border of the maxillary 

 is curved, not straight as it is in the last named genus, and the anterior 

 edge is nearly vertical ; between the lachrymal and the nasal the maxil- 

 lary forms a short, transverse suture with the frontal. The alveolar 

 border is straight and nearly horizontal. The palatine processes are long 

 and narrow and in this individual are indistinguishably fused with the 

 palatines and with each other. The hard palate is elongate and narrow, 

 strongly convex and very rugose between the molariform teeth, but be- 

 coming quite flat anteriorly, and everywhere perforated by numerous vas- 

 cular foramina. In the edentulous space there is a well-defined groove on 

 each external side, with raised outer border. The median anterior notch 

 to receive the premaxillary spines is quite small and of a broadly open U- 

 shape. 



The limits of the palatines cannot be made out. From the analogy of 

 other species it may be inferred that they form little of the hard palate 

 and are extended as large, vertical plates on each side of the posterior 

 nares. The pterygoids are narrow, inconspicuous plates, closely applied 

 to the descending processes of the alisphenoids, and not in the least like 

 the swollen, bulla-like bones of Nothrotherium, which Reinhardt has 

 described ('78, 336). The posterior nares resemble those of the last- 

 named genus in shape, but they are narrower anteriorly, extend farther for- 

 ward, to the line of the last tooth, but not so far backward, and with very 

 different side-walls on account of the different character of the pterygoids 

 and the much larger share taken by the alisphenoids in their formation. 



The lachrymal is a large, mammillate bone and, carried upon the zygo- 

 matic process of the maxillary, forms a conspicuous prominence on the 

 face and extends dorsally to the frontal. It agrees closely with that of 

 Notlirotherium, but has a larger and more slit-like foramen. 



The jugal, on the whole, most resembles that of Nothrotherium ; ante- 

 riorly it is expanded and articulates by an apparently movable joint with 

 the maxillary and lachrymal ; the dorsal border of the anterior half of the 

 bone is concave, describing nearly a semicircle and flared outward, to 

 form the rim of the orbit ; the postorbital process is a low and rounded, 

 but distinct angulation, while in the Pleistocene genus there is no trace 

 of it. The postorbital part of the jugal is much longer and more horizon- 

 tal than in the latter ; the suborbital process is a long, laterally com- 

 pressed plate, with convex anterior and concave posterior border, making 



