Mineralogy and Geology. 271 
_ This very rare mineral has not hitherto been observed in America, and 
its occurrence is therefore of peculiar interest. Iam indebte Cc 
ecim 
2. Wotices of Remains of Extinct Vertebrated Animals discovered by 
essor 8; by Joseru Lezpy, M. D., (Proc. Acad. Nat. Sci. 
Oo 
cies, in th 
of North Carolina. The tooth bears a wonderful resemblance to the 
worn of a young ox. It is nearly 5 inches long in the curve and over an 
inch in diameter at base, which is hollowed into a deep conical cavity, as 
in the spermaceti whale. 
repanodon impar, Leidy.—This species is founded on the crown 
. : : 
thin and smooth; the base of the crown is hollowed conically. ; 
Specimen 10 lines; breadth at base antero-posteriorly 7 lines, trans- 
Versely 5 lines 
j . 
2 & miocene deposit of Cape Fear, in North Carolina. Teeth elongated 
©onical, nearly straight or only slightly curved inwardly, m section circu- 
leiosaurus in the former character and the circular section. 
(4.) Pad 2 rus) priscus, Leidy, ante p. 165.—Half 
‘aicosaurus ? ( Compsosau ) pre 5 ‘ of 
