114 PROCEEDINGS OF THE l^ATIONAL MUSEUM. vol. ;.8. 



Alton specimens with those of the type. The mesostyles and para- 

 styles of the latter appear, however, to be slightly more strongly 

 developed, while the ribs, or styles, on the faces of the lobes are 

 narrower and more sharply defined on the Alton teeth. In the valley 

 between the two lobes of the last molar, on the inner face, there is 

 seen an accessory pillar, small on one tooth, well developed on the 

 other. A very small pillar occurs rarely in the same position in the 

 molars of T. oryx. 



Figure 8 of plate 5 presents a view of the inner face of the lower 

 left first molar. It is considerably larger than the correspond- 

 ing tooth of the African eland. It appears to be slightly worn, but 

 the apex is hidden in the hard nodule. At the rear of the anterior 

 lobe, in the upper half of the crown, a style develops which becomes 

 quite prominent. At the hinder border of the tooth is another sharp 

 style. The writer has found no specimen of the African eland with 

 unworn teeth with which to compare the upper halves of the crowns. 

 The lower right second molar (pi. 5, fig. 9) is shown here. On the 

 inner face, at the rear of the anterior lobe, is a style similar to that 

 of the first molar. Evidently there is nothing of the kind in the 

 African eland. Figure 10 of plate 5 represents the inner face of 

 the lower left hindermost molar. It had not yet come into use and 

 the base had hardly been completed. It differs from the correspond- 

 ing tooth of 7\ oryx in having a style on the rear of the anterior 

 lobe. On the plate cited (fig. 11) is shown the upper right second 

 molar. The measurements of it are given in the table. 



In the United States National Museum there is a lower left hinder- 

 most molar (Cat. No. 4987) of this species which was collected sev- 

 eral years ago at Kimmswick, Missouri, about 20 miles south of St. 

 Louis and 40 miles south of Alton. The height of this tooth is 50 

 mm. ; the length 53 mm. ; the thickness at the base of the first lobe, 

 23 mm. ; that at the base of the second lobe, 24 mm. ; that at the base 

 of the third lobe, 15 mm. At their summits the thickness of the lobes 

 in their order is 19 mm., 18 mm., and 11 mm. It is difficult to dis- 

 tinguish these lower hindermost molars from the corresponding ones 

 of camels. 



In 1913 ^ Dr. Paul Matchie noted Gidley's description of the 

 American eland. He was unable to find a series of teeth in the 

 African eland which corresponded to Gidley's figure of the fossil 

 eland or was in any way similar to it ("oder ihr wenigstens ahnlich 

 ist "). It is difficult to understand in what sense this statement is to 

 be taken. The teeth of both animals are not greatly different in 

 size and proportions. They are strongly hypsodont and are sim- 

 ilarly lobed. In both series of molars the parastyles, the mesostyles, 

 and the metastyles are prominent ; the faces of the lobes between these 



» Sitz.-Ber. Ges. Naturf. Freunde, Berlin. 1013, p. 258. 



