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molars ; the crowns of the two false molars, or the first and second of the 

 permanent series, were found in closed alveoli in the substance of the jaw,, 

 above the deciduous molars which they would have displaced and suc- 

 ceeded in the vertical direction. The crown of the second true molar, 

 the fourth or penultimate of the permanent series, was in like manner 

 in progress of completion in a closed alveolus behind the first true 

 molar, which it succeeds horizontally. 



The second tooth in situ, which is the third or last of the series of 

 deciduous molars, has a crown which is as complex as the true molar be- 

 hind it, supporting three transverse eminences with an anterior and 

 posterior basal ridge ; it is succeeded, as will be seen in a subsequent 

 specimen, by a permanent tooth, having, as is usually the case with the 

 premolar teeth, a more simple crown than the tooth displaced. 



From the miocene tertiary deposits at Epplesheim, Rhine Hessia. 



The original specimen is described and figured in Dr. Kaup's ' De- 

 scription d'Ossernens Fossiles de Mammiferes du Museum de Darm- 

 stadt,' l re Cah., pi. 1 Presented by Dr. Kaup. 



792. The crown of the first permanent premolar of the left side, which was re- 

 moved from the closed alveolus in the preceding specimen : it supports 

 two eminences, the outer one slightly and the inner one deeply cleft into 

 two mammillary processes : a basal ridge surrounds all but the outer part 

 of the circumference of the crown. The summits of the eminences are 

 entire and tuberculated. 



From the miocene tertiary deposits at Epplesheim. 



Presented by Dr. Kaup. 



793. The crown of the second permanent premolar of the left side, which was 

 removed from the closed alveolus in the specimen No. /83. Both emi- 

 nences are more deeply notched than in the first premolar, especially 

 the inner one, which is cleft to the base : the anterior of the maru- 

 milloid divisions is also joined by a continuous ridge to the anterior one 

 of the outer eminence. The transverse diameter of this molar exceeds 

 the antero-posterior, and it thus differs considerably both in the configu- 



