American Bacillaria. Pt. III. Echinellea and Lacernata / by J.W. Bailey.

  • Bailey, Jacob Whitman, 1811-1857.
Date:
[1842]
Catalogue details

Licence: Public Domain Mark

Credit: American Bacillaria. Pt. III. Echinellea and Lacernata / by J.W. Bailey. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    confer void, resulting from perfect division of the carapace, and imperfect division of the mantle. In this genus, corpuscles which cannot be distinguished from those of Navicula are assembled together in vast numbers, in flex- ible membranous tubes, within w’hich they may often be seen to move freely. They doubtless often leave these tubes, and then appear like species of Navicula. I have noticed several American species, but I am unable to decide whether they are identical with any hitherto described, as I have had very little opportunity to study our species in a living state and have no foreign specimens or figures to compare them with. I shall therefore content myself with merely giving the forms of the frustules found in each species, and such addi- tional particulars as seem most interesting. 1. Naunema . (PI. 3, fig. 14.) The figure represents cor- puscles from a branching species found on the shores of Staten Island, N. Y. The tubes are whitish, containing long rows of corpuscles, strung end to end, each of which contains two round globules looking like air-bubbles. No trace of striae. 2. Naunema . (PI. 3, fig. 15.) This figure shows the form of corpuscles which filled short robust unbranched filaments, which were exceedingly lubricous. Bunches of filaments about half an inch in length, were found in great abundance on Zostera, &c. at Stoning- ton, Conn. 3. Naunema — -. (PL 3, fig. 16.) This figure shows the out- line of dried corpuscles from a specimen obtained at Stonington, Conn., where it is very common. Its filaments are branched and form larger and longer bunches than the preceding, with which it occurs. 4. Naunema . (PI. 3, fig. 17.) This is from specimens found in immense quantities in the Hudson River, at West Point. The masses have not the green color of the two preceding species, but present a rich brown color. The frustules are in all respects like those of Navi- cula, and I have often seen them move spontaneously in their tubes, some going one way and others another. In PI. 3, fig. 17, a, is shown the outline of much longer frus- tules, found in tubes similar to those just mentioned. Gloeonema. Envelope double, carapace siliceous, mantle tubular, tubes sim- ple, often branched, corpuscles curved, resembling Cocconema in a tube, '