450 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 52 



The two lower molars which are in position, and the separate one, 

 are all very similar in form and size. The crowns are worn on top, 

 and also posteriorly, except the penultimate molar, which is much 

 abraded anteriorly. All three teeth present a form similar to that 

 of the tooth figured by Doctor Lydekker in 1899, but the two 

 branches of the root are not so widely divergent. They are nearly 

 parallel and curve backward inferiorly. In the separate molar 

 (pi. XLiv^ fig. 8) the anterior branch of the root is bent upward 

 like a fish-hook at the lower end and the tip lies on the outer side of 

 the posterior branch. The two branches are united nearly to the tip 

 by a portion which is thinner than themselves. On the outer side, 

 between the two branches, is a low, rounded eminence, like a rudi- 

 mentary third root. 



The molars present a distinct neck, above which is an equally dis- 

 tinct cingulum, having the appearance of an appressed band, with 

 the upper free margin developed in the form of small denticles. The 

 cingulum is most prominent and highest internally and posteriorly. 

 The crown is deeply wrinkled, the ridges being numerous, vertical, 

 and covered with rounded tubercles. The inferior molars which are 

 in position have one or two prominent denticles each on the posterior 

 edge of the crown, near its base, and others were probably present 

 higher up. The separate molar has a similar denticle on the anterior 

 edge. 



The three single-rooted teeth, which appear to me to belong to the 

 lower jaw, resemble one another in form, the roots being fusiform 

 and more or less curved backward. The crowns of two of them 

 (pi. XLiv, figs. 6 and 7) are worn away obliquely, but that of the 

 third (pi. XLiv, fig. 5) has the upper surface horizontal. In all three 

 teeth the crowns are rugose, but rather less so than in the molars. In 

 one (pi. XLiv, fig. 7) the root shows a deep longitudinal groove 

 internally, indicating an incipient division into two branches. The 

 crowns are lowest posteriorly. 



Of the upper single-rooted teeth, one (pi. xliv, fig. i) consists 

 only of the root, which is conical and nearly straight. The second 

 (pi. XLiv, fig. 2) is strongly curved and resembles the lower single- 

 rooted teeth. The crown is entirely worn away anteriorly. 



Of the two upper molariform teeth in this series, the larger (pi. 

 XLiv, fig. 3), probably a right premolar, resembles the lower molars 

 in general form. The two branches of the root are nearly parallel 

 and but slightly curved. The lower closed ends overlap each other. 

 On the inner side, between the two branches of the root, is a third 

 branch, directed inward nearly at right angles with the two others, 



