270 Scientific Intelligence: 
Accompanying this skeleton there were two perfect heads, and also 
two additional lower jaws, together with a number of teeth and other 
bones. By means of the teeth, which were contained in the jaws of 
animals of different ages, a complete dental series is displayed from an 
early period in the calf to its termination in the adult. 
This valuable collection has been purchased by a number of pre: 
men in Boston with the intention of presenting it to Harvard University. 
It has already been described by Dr. John C. Warren at a meeting of 
the American Academy of Arts and Sciences in November last ; and 
we learn that this gentleman will hereafter publish a minute description 
of both the specimens, accompanied with figures designed to represent 
them with accuracy. Some interesting points of anatomy will, it is 
hoped, be elucidated by these descriptions, and particularly the ques- 
tion of the existence of the Tetracaulodon as a distinct species. i 
13.: Missouri and Mississippi Valleys, (from the Report intended to 
illustrate a map of the hydrographical basin of the Upper. Mississippi 
River, made by I: N. Nicouzer, Feb. 16,1841. Washington, 1843.)— 
This valuable report by the late Mr. Nicollet, describes one of the most 
remarkable countries of lakes in the world. The map illustrating it is 
fall of interest to'the geologist, and was the result of vast labor. Mr. 
Nicollet was well known for his extensive learning in science, his accu- 
racy in observation, and his untiring zeal. The report gives a topo- 
graphical account of the region to which it relates, with numerous geo- 
logical and botanical observations. As some account of the cretaceous 
and other formations of the Missouri has already appeared in the Jour- 
nal, we cite at this time a few remarks on the —— and Missouri 
— 
“ The basin of the Upper Mississippi is separated in a great part of 
its extent from that of the Missouri by an elevated plain; the appeat- 
_ ance of which, seen from the valley of the St. Peter’s, or that of the 
Riviére Jacques, looming as it were a distant shore, has suggested for 
it the name of Coteau des Prairies. Its more appropriate designation 
would be that of plateau, which means something more than is con- 
veyed to the mind by the expression, a plain 
* Its northern extremity is in latitude 46°,, extending to 43° ; after 
which it loses its distinctive elevation above the surrounding plains, and 
passes into rolling prairies. Its length is about two hundred miles, and 
its general direction N. N. W. and 8.8. E. Its northern termination 
(called Téte du Coteau in consequence of its peculiar configuration) is 
not more than fifteen to twenty miles across ; its elevation above the 
level of the Big Stone lake is eight hundred and ninety feet, and above 
the ocean nineteen hundred and sixteen feet. Starting from. this eX+ 
temity;: tele is, the head of the Coteau,) the surface of the plateau is 
, forming many dividing ridges which separate the» wa- 
