62 NATURAL HISTORY MISCELLANY. 
a depth of sixteen feet; and four miles north, charred wood and a bivalve 
shell from a depth of nineteen feet 
It may not be improper here to state that boulders and many rounded 
pebbles of granite, sienite, greenstone, etc., with ac d of drift 
sands, abound along the north line of Missouri, dapes even abundant 
near the line of the Hannibal and St. Joseph Railroad; iei south they 
are more rare, being scarce near the Missouri River. In Baliak shes 
Missouri, I have observed a granite boulder twenty-five feet in diameter; 
in Monroe County, a greenstone boulder, three feet in diameter. Ná r 
the Missouri River one is rarely found more than a foot in diameter. In 
Osage County, Missouri, I have only found one small granite boulder, and 
found none in the upper river counties on the south. The Missouri River 
hornstone, greenstone, lignite and quartz rock, with pebbles from neigh- 
boring rocks; all the first named pebbles are borne down from far up in 
the mountains. 
The absence of granitoid rocks in the accumulations along the Osage 
and its tr ibutaries may be sufficient evidence to place the era of these de- 
posits in a more recent period than that of the modified drift of North 
Missouri. They may belong to the older loess or bluff, and we may con- 
clude the horse, ox, mammoth and mastodon to be coexistent. Itis even 
probable that they may have roamed America during the epoch of the 
mound builders. — G. C. BROADHEAD, St. Louis, Mo. 
EW MOSASAUROID REPTILES. — Professor Marsh has kei pes 
in soy “ American Journal of Science,” a notice of four n reptiles 
egeta or tiled, to Mosasaurus, from the Greensand o Hach Jersey. 
Her at ** a striking difference between the reptilian fauna of the 
mains of Ichthyosaurus and Plesiosaurus, which here appear to be en- 
tirely wanting; while the Mosasauroids, a group comparatively rare in 
the Old World, replace them in this = s are abundantly repre- 
sented by several genera and numerous spec 
SCoLITHUS a SroxGE. — Mr. E. Billings has referred the supposed casts 
of worm burrows, named Scolithus and Arenicolites, and found in Silu- 
with their sometimes wide and trumpet-shaped icon or even with or 
a little elevated above the surface. — SCIENTIFIC OPIN 
ANTHROPOLOGY. 
RELICS FROM THE GREAT Mounn. —I send in this letter a perforated 
shell a and an oblong bead. They were found with many others in 
a TIN 
