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Updated: June 28, 2025
In a slab of sandstone, not more than an inch thick, the furrows or ridges of an ancient ripple may often be seen in several successive laminae to run towards different points of the compass. Successive Deposition indicated by Fossils. Limestones formed of Corals and Shells. Proofs of gradual Increase of Strata derived from Fossils. Serpula attached to Spatangus. Wood bored by Teredina.
As the corals approach the conchylia, this interramification decreases. The tubipora forms the transition to the serpula; for the characteristic of all zoophytes, namely, the star shape of their openings, here disappears, and the tubiporæ are distinguished from the rest of the corals by this very circumstance, that the hollow calcareous pipes are placed side by side, without interbranching.
I have taken this tree because it is commonly supposed to be stiff and ungraceful; its outer sprays are, however, more noble in their sweep than almost any that I know: but this fragment is seen at great disadvantage, because placed upside down, in order that the reader may compare its curvatures with c d, e g, and i k, which are all mountain lines; e g, about five hundred feet of the southern edge of the Matterhorn; i k, the entire slope of the Aiguille Bouchard, from its summit into the valley of Chamouni, a line some three miles long; l m is the line of the side of a willow leaf traced by laying the leaf on the paper; n o, one of the innumerable groups of curves at the lip of a paper Nautilus; p, a spiral, traced on the paper round a Serpula; q r, the leaf of the Alisma Plantago with its interior ribs, real size; s t, the side of a bay-leaf; u w, of a salvia leaf; and it is to be carefully noted that these last curves, being never intended by nature to be seen singly, are more heavy and less agreeable than any of the others which would be seen as independent lines.
The number of accurately examined Annulides amounts to sixteen, among which are found some of very fine and unknown forms. Most of them belong to the well-known species Cirrhatulus, Arenicola, Aceronereis, Nereis, Aphrodita, Serpula, Amphitrite.
M. Bory St. Vincent has described similar calcareous beds over nearly the whole of the plain of Pamplemousses. Near Port Louis, when turning over some large stones, which lay in the bed of a stream at the head of a protected creek, and at the height of some yards above the level of spring tides, I found several shells of serpula still adhering to their under sides.
Still higher in the series, so far as the construction of a tenement is concerned, is that known as the SERPULA, a worm which constructs a calcareous tube more or less loosely convoluted and adherent to a shell or stone or coral, or sometimes entwined into a self-supporting colony.
See on the brown rock, whose surface is covered with the softest growth, the white anemone stretching its crown of delicate tentacles to the light; or the long winding case of the serpula, from the end of which appear the purple, brown, or yellow feathers that decorate the head of its timid occupant.
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