55 



Thus the Chalicotheriidae must be referred to a distinct order of unguiculate Mammalia, 

 which I propose to call the Ancylopoda, with the above definition. Two genera belong to 

 the single family, the Chalicotheriidae, viz., Chalicotherium Kaup, and Ancylotherium 

 Gaudry. In the former, the phalanges are distinct ; in the latter, the first and second are 

 coossified (Lydekker). Marsh has not yet shown how his genus Moropus differs from 

 Ancylotherium. The species described by Marsh under this name are from the Loup Fork 

 bed of Kansas." 



A separate lower left premolar of a Chalicotheroid (collection of 1904) is probably referable 

 to this species. The tooth (plate III, figs. 7, 8 and 9) is regarded as the third premolar, and 

 has an anteroposterior diameter about equal to the space for the corresponding tooth, of which 

 the roots are preserved, in the above (type) mandible. Professor W. B- Scott, of Princeton 

 University,has kindly examined this specimen, and, although agreeing with the writer that it 

 is the lower premolar of a Chalicotheroid, considers it unlikely " that the genus Chalicotherium 

 should be found in the Titanotherium beds, for that genus is typical of the Middle and Upper 

 Miocene of Europe." He is of the opinion that " much more probably the species of Cope 

 will prove to be referable to one of the genera of the French Oligocene, such as Schizotherium ." 



The Cypress Hills species needs to be studied from better material before its true generic 

 affinity can be determined. 



RODENT! A. 

 SCIURUS? SASKATCHEWENSIS, Sp. nOV. 



Plate VIII, figs. 16, 17. 



A species of rodent, most nearly allied apparently to Sciurus, is represented by a molar 

 tooth. As enough characters are not supplied by the single tooth for the proper definition 

 of the undescribed genus seemingly indicated, a provisional reference to Sciurus is made for 

 the present. The species is described as new. 



The tooth is apparently an upper left molar. The crown, which is borne on three roots, is 

 subquadrangular in outline as seen from below, with the antero-posterior diameter slightly 

 less than the transverse diameter. The maximum antero-posterior measurement (length) is 

 near the outer side. Of the three roots, one is internal and is much the largest, the other two 

 are external and subequal. The height of the enamelled surface of the crown is twice as 

 great internally as externally. 



The tooth is only slightly worn. The pattern consists of an external median enamel 

 inflexion, extending inward nearly across the crown, and two fossettes, one anterior, the other 

 posterior. The enamel inflexion has a depth greater than half the height of the external face 

 of the crown but the two fossettes are not so deep. Of these latter, the posterior one is the 

 larger and is complete, the anterior one is closed outwardly but communicates inwardly with 

 the median inflexion. A narrow marginal ridge is continuous round the crown except where 

 it is interrupted by the external enamel inflexion. This ridge is most prominent internally, 

 anteriorly and posteriorly it sinks to a lower level, rising again to enclose the fossettes 

 externally. 



