One specimen contains exclusive quantities of segments of the encrinite of small diameter, from one-fourth of an inch down to minute. Another specimen also, with numerous small encrinites, has a very wide and short radiated productus. Another specimen, a grayish chert, containing cavities formed by the solution and disappearance of encrinites. The parts of these which were originally hollow when in the state of carbonate of lime, being subsequently filled with chert, now show the nature of the fossil, being cylindrical cavities, with a solid centre and transverse partitions, the largest three-tenths of an inch wide. From Rector's-hill, adjoining the village of Clarksville, Missouri, from Dr. Sommerville's collection:-- A specimen of oolite--carbonate of lime. It is composed of small spherical granules in contact with each other, which, in their fracture, exhibit rather a concentric tendency, with the appearance of a central nucleus; but we could not perceive any decided evidences of former organization in them. Imbedded in the mass are a few columnar segments of encrinites, and a portion of a compressed bivalve, which, in the form of its radiating lines, resembles a pecten. From Charbonière:-- A specimen in argillaceous sandstone of a portion of a leaf like the nelumbium. It is only the middle portion of the impression of the leaf that remains, being of an oval form of about five inches in greatest diameter, the rest being broken away; the stalk has been broken off at the junction of the leaf. Productus spinosus. SAY. A small species of terebratula, in width two-fifths, and in length more than seven-tenths of an inch--an internal cast--individuals very numerous, varying much in size, the smallest being about one-fifth of an inch wide. From the Mammelles near St. Charles:-- Productus: a portion of a valve, and smaller portion of the opposite valve of a remarkably large species, of which the proportions may have been not dissimilar to that of the Ency. Meth. pl. 244. fig. 5. The striæ are similar to those of that shell, except in being somewhat smaller; and the groove of one valve, and consequent elevation of the other, not so profound, less abrupt, and more angular in the middle, and far less prominent on the edge of the shell. It may justly be named _grandis_, as its hinge width was more than 3-1/2 inches.--JAMES. [110] The town established here was Osage City. In 1823 it was described as still "nearly in a state of nature." The present population is about five hundred.--ED. [111] Moreau's Creek (River à Morou, Marrow Creek, Murrow Creek) flows from the south. Moreau signifies "extremely black." Just above Cedar Island is Jefferson City (Missouriopolis on the map,) the state capital.--ED.