846 MR. H. MATSUMOTO ON THE GENERA OF 



anterior side of the protocone to the anterior half of the inner 

 surface of the hypocone. 



; Text-fieure 3. 



Titanoliyrax ultimus. Crown view of left lower Mo ; natural size ; M. 12058 ; 



paratype. 



The M is moderately worn (text-fig. 3). The worn area, as well 

 as the lophids as a whole, is "W-shaped. The differentiation of 

 the metastylid from the metaconid (a generic character) is rather 

 feeble being feebler than that in the other smaller species of this 

 o-enus. The entostylid is differentiated from the entoconid, being 

 as well differentiated as the metastylid is from the metaconid ; 

 this differentiation is obviously more intense than that in the 

 other smaller species. The anterior and posterior basal cingula 

 are well developed ; the latter has a distinct tubercle, just behind 

 the posterior transverse ridge and outside the entostylid. The 

 outer basal cingulum is feeble, being represented by a few rather 

 insio-nificant crenulse between the bases of the protoconid and 



hypoconid. 



Text-fisfure 4. 



Titanohyrax ultimus. Crown view of left upper P^ ? ; natural size; M. 12059; 



paratype. 



The P is well worn (text-fig. 4). The parastylar and meso- 

 stylar folds are very acute. The outer surface of the paracone is 

 distinctly concave, while that of the metacone is rather flat. The 

 worn area of the protocone is oval, with an acute prolongation 



