MOLAR TEETH OF XEOPLAGIATJLAX. 29 



pared with the upper ones ; and, at the same time, that the rare 

 detached molars on which the genus Microlestes is founded may be 

 also those of the lower jaw. 



I add the following pai'agraph from the close description by 

 Prof. Lemoine of the upper true molars of his rare and interesting 

 fossil : — 



" Molaires superieures (pi. vi. 17-17 his) preseutent trois 

 range'es de denticules bien caracteristiques." — " La rangee mediane 

 de denticules se trouve separee des deux rangees laterales par un 

 sillon assez large. Les rangees laterales de denticules bordent de 

 chaque cote la couronne ; les denticules en question sont de meme 

 forme que les denticules medians, mais ils sont plus petits. Kous 

 avons compte cinq denticules pour chacune de ces rangees " (loc. cit. 

 p. 260). 



Here is indicated the chief difference, besides size, between the 

 upper true molars of Neoplagiaulax and Tritylodon. In the latter 

 the tubercles (" denticules") do not exceed three in number in the 

 middle row and the inner row, and are but two in the outer row : 

 and they are of proportionally larger size. 



DlSCTJSSIOIS". 



The Peeside]S"t expressed his regret and that of the Society that 

 the care which the author's health now required prevented him at 

 this season of the year from being present at the reading of the 

 paper. 



Prof. Seelet referred to the discovery by Dr. Fraas of teeth of 

 the Trias of Wurtemberg, to which he gave the name of Triglyphiis. 

 Prof. N'eumayr of Vienna had lately pointed out the resemblance 

 between the teeth of Tritylodon and Triglyplius. He could not 

 agree with the author in thinking there was any evidence that the 

 molars of the lower jaw had only two rows of tubercles. 



Mr. Ltdekker also doubted the truth of the author's suggestion 

 concerning the teeth of the lower jaw. He thought that the con- 

 dition of the teeth in the upper jaw of Tritylodon^ the fourth molar 

 being less worn than the fifth, pointed to the conclusion that this 

 form belonged to the Marsupialia rather than to the Eutheria. 



