186 NEBRASKA GEOLOGICAL SURVEY 



upper tusks had dropped out, but the tip of one, found in close 

 proximity, undoubtedly belongs to this skull. Numerous other 

 tusks were found on this level, and all show pronounced enamel 

 bands. This early proboscidean is neither as low-browed, nor as 

 long-jawed as one might expect. 



The widely expanded anterior nares, the retreating and thick- 

 ened nasals, and the breadth of surfaces for attachment of muscles, 

 suggests the probability of a fairly well-developed, though not 

 large, proboscis. But the tusks were light, and the combined load 

 imposed upon the neck muscles did not demand great expanse of 

 skull surface. 



EUBELODON MORRILLI, gen. et Sp. nOV.* 



Quarry No. I is 75 feet higher up the canyon wall, and about 

 35 feet below the general level of the surface, perhaps 100 yards 

 to the southeast of Quarry No. 2. From this point, another 

 proboscidean skull and mandible, complete pelvis, ribs, and stray 

 limb bones were secured. We have named this specimen Eube- 

 lodon morrilli, in honor of Honorable Charles H. Merrill, a former 

 President of the Board of Regents, and for many years a patron 

 of the Department. This individual is larger in size than the 

 first mentioned, and has marked structural differences. The 

 mandible is destitute of tusks. In some respects, Eitbelodon seems 

 to be a more primitive form than Tetrabelodon willistoni. It is 

 a large, exceptionally long-jawed, low-browed proboscidean. The 

 mandible is fully 43 inches (1,902 mm.) long, and 20 inches (509 

 mm.) across the condyles, and has but one large tooth in each 

 rainus. The symphysial prolongation is 15^ inches (393 mm.). 

 The lingual groove is shallow, with rounded edges. The skull, 

 as far as it has been worked out is rather flat and long. 



The two tusks, found in exact position, are finely preserved. 

 They curve downward, slightly outward, and are without enamel 

 bands. The tusks are worn to sharp, chisel-like tips. A section 

 of the tusk near the alveolus is an inverted ovoid 4^/2 inches (115 

 mm.) in vertical diameter, and 3^ inches (89 mm.) in horizontal 

 diameter, with a pulp cavity 2^ (70 mm.) X i$4 inches (45 mm.). 



* The proposed generic name, Eubelodon, signifying well-tusked, eu- 

 phonically implies relationship to Tetrabelodon and Dibelodon. 



