The Cambridge natural history Volume 2

9781152878402: The Cambridge natural history Volume 2
Ver todas las copias de esta edición ISBN.
Reseña del editor:

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ...little heaps, indicate the burrows of Arenicola, the common "lug-worm "; these " castings" have passed through the worm's body, having been swallowed during the process of burrowing as well as for the purpose of obtaining food, as in the case of the earthworms. Bather nearer the water may be seen little tufts of sand-threads, about an inch high, springing from a short piece of cylindrical, sandy tube rising up out of the sand; this is the head end of the tube of Terebella conchilega (Fig. 153). Amongst the rocks may be found loose stones of different sizes; on lifting them up, various kinds of worms may be brought to light, according to the locality, the time of year, the position with respect to the sea, and so on. Polynoc is pretty sure to be present somewhere near low-tide mark; the number of species is considerable, and their colouring very varied: but as the worms have a habit of remaining still on the under surface of the uplifted stone, the observer may easily overlook them. Other worms occur below the stones, more or less buried in the sand or mud; for instance, a small Xercis may be lying in its temporary burrow immediately underneath, and will at once withdraw from the now injured part of the burrow; while deeper in the mud or sand, especially in rather highly-smelling mud, little red worms are abundant, such as Scoloplos, Nerine, Capitella, and others. By digging near low water one may find Nephthys, Glycera, and others burrowing or hiding in the soil. In rock pools, or Bandy stretches amongst rocks kept moist and cool by abundant Fucus, one may see under stones the red or yellow gill filaments of Cirratulus and of Terebellids protruding from their burrows and tubes, while other worms are to be met with in clefts of the rocks,...

"Sobre este título" puede pertenecer a otra edición de este libro.

(Ningún ejemplar disponible)


Crear una petición

Si conoce el autor y el título del libro pero no lo encuentra en IberLibro, nosotros podemos buscarlo por usted e informarle por e-mail en cuanto el libro esté disponible en nuestras páginas web.

Crear una petición