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BULLETIN 16 9, UNITED STATES NATIONAL MUSEUM 



P2 has a single but larger root. Its crown is simple, with one cusp, 

 convex on the outer face and excavated anterointernally near the tip, 

 followed by a small, mainly internal heel, not forming a definite cusp, 

 P3 is larger and has two poorly separated roots. The anterointernal 

 excavation is accentuated and tends to pinch off a very rudimentary 

 paraconid, but there is no trace of a metaconid. The heel rises to a 

 single, distinct cusp. P4 is nearly molariform. The paraconid is 

 small but distinct and is median. The metaconid is nearly as high 

 as the protoconid, with which it is partly confluent. The talonid is 

 well developed, of about the same width as the trigonid, and has a 

 large hypoconid and smaller entoconid and hypoconulid, the latter 

 median. 



Figure 25.~Eudae'monema cuspidata Simpson, U.S.N.M. no. 9314, 

 left lower jaw: a. Crown view; 6, internal view. Three times natu- 

 ral size. 



Figure 26. — Eudaemonema cus- 

 pidata Simpson, U.S.N.M. no. 

 9558, left upper molars: a, Ex- 

 ternal view; 6, crown view. 

 Three times natural size. 



Mi_2 are closely similar to each other. The trigonid is moderately 

 elevated and is narrower than the talonid. The paraconid is low and 

 shelflike but is distinct and is united by a crest to the crescentic pro- 

 toconid. The paraconid is about intermediate between the median 

 and internal positions. The metaconid is slightly higher than the 

 hypoconid, and the hypoconulid is lower and near the entoconid but 

 more distinct from it than in Elpidophorus. All three talonid cusps 

 are unusually lofty and distinct. A cuspule tends to develop on the 

 hypoconid-metaconid ridge. M3 has the talonid narrower, about as 

 wide as the trigonid, and the hypoconulid projects posteriorly and is 

 higher than the other talonid cusps. 



Of the four specimens that show the posterior mental foramen, it is 

 beneath P4 in two (including the type), is double with both under P4 

 in another, and in the fourth is beneath P4 but is followed by another 

 of much smaller size under Mi. In all cases the anterior mental 

 foramen is larger, pronounced, and beneath P2. 



