Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 17, 2025
Helena History of the changes in the Vegetation Cause of the extinction of Land-shells Ascension Variation in the imported Rats Volcanic Bombs Beds of Infusoria Bahia Brazil Splendour of Tropical Scenery Pernambuco Singular Reef Slavery Return to England Retrospect on our Voyage. APRIL 29th. In the morning we passed round the northern end of Mauritius, or the Isle of France.
Judging, therefore, as he has a right to do, by the similarity of the land-shells, Mr. Bland is of opinion that Porto Rico, the Virgins, and the Anguilla group once formed continuous dry land, connected with Cuba, the Bahamas, and Hayti; and that their shell-fauna is of a Mexican and Central American type. The shell-fauna of the islands to the south, on the contrary, from Barbuda and St.
The main points of interest consist, first in some highly fossiliferous strata belonging to the Devonian or Carboniferous period; secondly, in proofs of a late small rise of the land; and lastly, in a solitary and superficial patch of yellowish limestone or travertin, which contains numerous impressions of leaves of trees, together with land-shells, not now existing.
In the other groups of insects I was not so successful, but this was not to be wondered at in a mere exploring ramble, when only what is most conspicuous and novel attracts the attention. Several pretty beetles, a superb "bug," and a few nice land-shells were obtained, and I returned in the afternoon well satisfied with my first trial of the promised land.
Why, there is not a heap of dead leaves among which by picking it through carefully you might not find some twenty species of delicate and elegant land-shells; hardly a tree-foot at which, among the moss and mould, you might not find the chrysalides of beautiful moths, where caterpillars have crawled down the trunk in autumn, to lie there self-buried and die to live again next spring in a new and fairer shape.
As there were 21 seams of coal in this intervening mass, the length of time comprised in the interval is not to be measured by the mere thickness of the sandstones and shales. This lower bed is an underclay seven feet thick, with stigmarian rootlets, and the small land-shells occurring in it are in all stages of growth.
The loess is generally devoid of fossils, although in many places they are abundant, consisting of land-shells, all of living species, and comprising no small part of the entire molluscous fauna now inhabiting the same region.
Woodward has shown that the same law holds good with sea-shells, but from the wide distribution of most genera of molluscs, it is not well displayed by them. Other cases could be added, as the relation between the extinct and living land-shells of Madeira; and between the extinct and living brackish-water shells of the Aralo-Caspian Sea.
We flattered ourselves that these extensive reefs would produce a fine harvest of shells; but, although every exertion was made in the search, we did not add as many to our collections as we anticipated. Some land-shells, however, were found that we little expected to meet with, for many of the trees were covered with them, and on cutting them down, large quantities were easily obtained. Mr.
The lowest point to which the thermometer fell was 41.5 degrees, and occasionally in the middle of the day it rose to 69 or 70 degrees. Yet with this high temperature, almost every beetle, several genera of spiders, snails, and land-shells, toads and lizards, were all lying torpid beneath stones.
Word Of The Day
Others Looking