[174] The camp was in the southeast corner of Washington County, Nebraska. Boyer River rises in Sac County, Iowa, flows southwest through Crawford and Harrison counties, and debouches in Pottawatomie County, nearly opposite the boundary between Washington and Douglas counties, Nebraska.—Ed.
[175] Height of the bluff, ascertained by Lieutenant Graham.
| Trigonometrically, | 271 feet. |
| Barometrically, | 277 feet. |
—James.
[176] We add some notices of a few of the most important.
1. Terebratula.—A specimen considerably resembling the T. subundata of Sowerby, in the undulated line of the edges of the valves; but it is a much more depressed shell, and of a much less rounded form.
In the young state, the undulation of the edge is not very distinct; but this character increases with age, so that in the young state, it appears like a totally different species from the adult.
2. In the same rock are very numerous arquated spines, like ribs of fish, some of them 1½ inches long.
3. A fragment of a terebratula or productus, imbedded, with very long spines, which may possibly be the same with the above.
4. A specimen, being a mass of comminuted fragments of shells, amongst which are only recognizable a few segments of the column of the encrinus, and minute turretted univalves of five whirls, which resemble turritella, and are about one-twentieth of an inch long.