Excerpt from On Fucoides in the Coal Formations
Though the very clear descriptions and good figures given by Prof. Hall seem indeed to indicate, at least for his new species, the growth of a frond around a spiral axis, it is plain also that we cannot suppose for the plant her... e above described a similar mode of develop ment. The same can be said, I think, of both the forms represented in Prof. Hall's report, the one p. 80, fig. 2, which the author considers as a distorted portion of a last volution of a spiral of Spimphyton Cbudw-galli; and the other, p. 81, fig. 3, named S. Velum. For the first of these fronds has, as it has been remarked, exactly the same general form and appearance as the plant represented fig. 2 of our plate, and the other bears at one of its corners the broken remains of what is rightly called a stem by M. Vanuxem, which indicates a mode of growth similar to that of our Caulcrpites marginatus. Therefore, these closely related three forms should be forcibly ejected from the genus Spirophyton, this name being inapplicable to plants whose growth has been as a plain untorted lamina.
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