No tube-feet or papillae, but tentacular ampullaemore or less developed.
In the dancer the cupola of the crista acustica is not so plainly marked and not so highly developed, and the raphae of the ampullae and canals, which frequently are clearly visible in the gray mouse, are lacking (21 p.
In Figure 7 the ampullae of the three canals are marked respectively, ampulla anterior, ampulla posterior, and ampulla externa.
Note that the ampullaeand tube-feet are all connected with the radial canals.
By a contraction of the delicate muscles in the walls of the ampullae the fluid in the cavity is compressed, thereby forcing the tube-feet out.
By injecting here, the whole system of vessels, tube-feet, andampullae are filled.
These facts point to the two sets of canals and ampullae acting as one organ, in a manner analogous to the action of two retinae for single vision.
D--Ampullae likewise placed in sand which is contained in a box, of which the spouts from the opercula extend crosswise into ampullae placed under them.
E--Other ampullae receiving the distilled aqua and likewise arranged in sand contained in the lower boxes.
Illustration 446 (Parting precious metals with nitric acid): A--Ampullae arranged in the vessels.
C--Ampullae placed in the sand which is contained in a box, the spouts of which reach from the opercula into ampullae placed under them.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ampullae" in a variety of sentences. We hope that you will now be able to make sentences using this word.
