Annals & Magazine of Natural HistoryTaylor & Francis, Limited, 1851 |
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Términos y frases comunes
Alum Bay anfractibus angle animal antennæ anthers aperture apex apice appears Arachn Armeria maritima base beak belong British brown Bulimi cells central Char character Chemnitzia Cissampelos clay cliff Cloudy Cocculus colour conchology convex costæ Cuming Cyrena described diameter distinct dorsal edge eggs elytra feet female fish fossils freshwater frustule genera genus head hinge-line Hist inch Insect island lateral length lines lower Lycosa M'Coy Major Greenwood male membrane Menispermacea metathorax Mollusca mouth Murex nearly oblique oblong observed obtuse operculum organs ovarium ovate pale peristome plants plate posterior rain A.M. resemblance ridges rounded sand scutellum segments shell short showers side slender slightly smooth species specimens spines spirá spiral spores stamens striæ structure surface teeth tentacula testá thick Thomisus thorax tibiæ transverse University of Cambridge upper valve ventral margin whorls width wings yellow
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Página 350 - Medusabud falls off before its full development, while this is not so with plants. But it is obvious that this is unimportant in its bearing on this subject. It is a consequence of the grand difference in the mode of nutrition in the two kingdoms of nature ; for the plant-bud on separation loses its only means of nutriment. The law of alternating generations is therefore no limited principle, strange and anomalous, applying only to a few Radiata.
Página 355 - When the furrow is made, the male and female retire to a little distance, one to the one side and the other to the other side of the furrow : they then throw themselves on their sides, again come together, and rubbing against each other, both shed their spawn into the furrow at the same time. This process is not completed at once ; it requires from eight to twelve days for them to lay all their spawn, and when they have done they betake themselves to the pools to recruit themselves. Three pairs have...
Página 76 - The fish froze," says Captain Franklin, " as fast as they were taken out of the nets, and in a short time became a solid mass of ice, and by a blow or two of the hatchet were easily split open, when the intestines might be removed in one lump. If in this completely frozen state they were thawed before the fire, they recovered their animation.
Página 289 - The body is rather elongated, slightly compressed posteriorly ; head moderately broad and long, depressed, truncated anteriorly ; its length is contained five times and a half in the total length of the fish.
Página 161 - The accounts which he received concerning it soon led to the discovery of a second egg, of nearly the same size, which was found, perfectly entire, in the bed of a torrent, among the debris of a landslip which had taken place a short time previously. .Not long afterwards was discovered in alluvia, of recent formation, a third egg, and some bones, no less gigantic, which were rightly considered as fossil, or rather, according to an expression now generally adopted, as...
Página 497 - It is almost useless to attempt to find these reptiles without dogs, as the resemblance of their colour to that of the trees they inhabit prevents them from being easily seen. Few dogs but those accustomed to the sport will touch them, as, in addition to the blows which they inflict with their tails, they bite and scratch furiously ; and when once they lay hold of anything with their teeth, they can only be made to let go by an inducement to bite, some other attractive object being offered to them....
Página 237 - Mr. Desor communicated some observations made by Mr. Whitney and himself in reference to the probable origin of the so-called fossil rain drops, which in this country, are found on slabs of new red sandstone, as well as Potsdam sandstone. He said it had already been noticed by Mr. Teschemacher that these so-called rain drops, when closely examined, are found to differ in several respects from the impressions made by the rain on a beach, where each drop produces an impression surrounded by a rough...
Página 235 - ... littoral and laminarian forms are peculiarly arctic, whilst the deeper species are boreal or celtic, may be explained also by the influence of warm currents flowing northwards and diffusing the germs of species of more southern regions in the coralline and deep-sea-coral zones ; for in the arctic • •seas the temperature of the water is higher at some depth than near the surface. On the other hand, we find in a region farther to the south than Britain, an outlier of the Celtic fauna preserved...
Página 348 - Campanulariae : — 3. The polyps produce a kind of bud that finally drops off and becomes a Medusa. Thus the egg of a Medusa, in such cases, does not produce a Medusa, except after going through the intermediate state of a polyp. Or if we commence with the polyp, the series is thus : — • 1. The polyp produces bulbs that become Medusae. 2. The Medusae produce eggs. 3. The eggs produce polyps. This is what is called by Steenstrup " Alternation of Generations ;'' and he considers the earlier generation...
Página 166 - The people of the island report that at a certain season of the year, an extraordinary kind of bird, which they call a rukh, makes its appearance from the southern region. In form it is said to resemble the eagle, but it is incomparably greater in size; being so large and strong as to seize an elephant with its talons, and to lift it into the air, from whence it lets it fall to the ground, in order that when dead it may prey upon the carcase.