They were traversed by numerous ditches or canals for irrigation, in all of which a proportion of fresh-water shells, chiefly Lymnaeae, were seen.
In one place, on the north side of the river, nearly opposite to the village of Tertse, I found these beds to contain fresh-water shells.
In the Sandwich Islands also recent observations refer to the absence of water-beetles, though here there are a few fresh-water shells.
We have evidence in the loess of the Rhine of considerable changes of level in the land within a very recent geological period, and when the surface was peopled by existing land and fresh-water shells.
Other cases could be added, as the relation between the extinct and living land-shells of Madeira; and between the extinct and living brackish-water shells of the Aralo-Caspian Sea.
From the sedimentary character of the deposit, as well as the abundance of fresh-water shells, there could be no doubt that formerly the place had been occupied by a lake.
Below a thin covering of vegetable-mould there was a peaty bed about 16 inches thick, and underneath this, lake-marl containing various kinds of fresh-water shells to the extent of 3 feet 4 inches.
While awaiting, at Prairie du Chein, the preparations for ascending the Wisconsin, the locality was found a very remarkable one for its large unios, and some other species of fresh-water shells.
Fresh-water Shells collected by Mr. Schoolcraft in the valleys of the Fox and Wisconsin Rivers.
The fury of the waves renders it a region wholly unfitted to the whole tribe of fresh-water shells.
It is also remarkable for its numerous varieties, and the large size of its fresh-water shells.
In all probability, also, we should find in some of the beds the remains of fresh-water shells or plants or other organisms which inhabited the lake at the time these beds were being deposited.
The fossils are chiefly marine; but there occur also land and fresh-water shells, together with the remains of numerous Mammals.
This conglomerate contains land-snails (Helix) of various sizes, mixed with fresh-water shells.
These are also fresh-water shells, having opercula, and covered by a smooth green, or greenish-brown epidermis.
The fresh-water shells described as Cerithia by Lamarck, are separated under the name Potamis, and may be known by the thick, horny epidermis.
These are fresh-water shells, covered on the outside by a thick horny epidermis, and pearly within.
I come now to refer to the fresh-water shells of these regions.
For its size, my collection presented a large amount of novelty, coming as it did from a region the land and fresh-water shells of which were previously considered to be fairly known.
Orbigny found two extinct fresh-water shells, namely, a Unio and Chilina.
A quantity of the fresh-water shells of the lake were, at my request, brought in by the Indian girls.
The fresh-water shells on this river are chiefly unios.
Returning therefore to Philadelphia, I made there the acquaintance of Mr. Haldeman, author of a monograph on the fresh-water shells of the United States.
Distribution of European land and fresh-water shells.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "water shells" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
