Sinclair-furlong.] Euceratherium, A New Ungulate. 



413 



ing strata. This material comprises broken horn-cores, teeth 

 and podial elements. The horn-cores and teeth agree closely 

 with those of the type specimen. 



The age of the deposit in the Samwel and Potter Creek Caves 

 is later Quaternary, but the Potter Creek Cave is probably the 

 older. 



Cranium. — The cranium is that of a fully matured individual 

 In size it approximates the skull of a small cow, and resembles 

 Bos in the elongated facial region and the restriction of the 

 parietal to the occiput. In the front view (PI. 51), the facial 

 region appears broad, in striking contrast with the narrowing of 

 the forehead posteriorly. The interorbital area is broadly con- 

 vex, becoming slightly inflated toward the bases of the horn- 

 cores, as seen in the lateral view (PI. 50), where the pneumatic 

 cavities approach the surface, reducing the thickness of the 

 frontals to a mere shell. The prominent orbits are well in 

 advance of the horn-cores. Opposite the posterior rim of each 

 orbit there is a small supraorbital foramen. The frontals reach 

 the occiput, excluding the parietal from the cranial roof, and 

 confining that element to the back of the skull. 



The horn-cores are supported by the frontals at the posterior 

 extremity of the skull. Although situated close together, their 

 bases do not coalesce. Internally, the cores are filled with can- 

 cellous bone tissue and are not penetrated beyond their bases by 

 the pneumatic cavities of the forehead. Proximally, the horn- 

 cores are elliptical in cross section but become circular toward 

 the tips. The proximal portions of the cores are directed back- 

 ward and upward. Distally, they curve outward and forward 

 with a slight upward turn toward the tip. They are pierced by 

 many nutrient foramina and are deeply marked on the outer side 

 by vascular channels. The anterior margin of the left horn-core 

 bears two low prominences situated about half way up the shaft. 

 These were not observed on any of the horn-cores from the Potter 

 Creek Cave. 



On the back of the skull the parietal and occipital elements 

 are fused into a vertical plate, which meets the frontal plane at 

 an acute angle. Superiorly the occiput is narrow corresponding 

 with the great narrowness of the forehead. It widens toward 



