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But the joint hosts of the fishes may be the mollusca or other creatures on which they feed, and hence the new fields for Atkinson in Nelson's catches. There is a relative simplicity in the round of life in its higher forms in these regions that would seem especially hopeful for the parasitologist.
In the department of zoology, we see zoophytes, radiata, mollusca, articulata, existing for ages before there were any higher forms. The first step forward gives fishes, the humblest class of the vertebrata; and, moreover, the earliest fishes partake of the character of the next lowest sub-kingdom, the articulata.
I have been trying to realize from memory the particular instincts of those antediluvian animals of the secondary period, which succeeding to the mollusca, to the crustacea, and to the fish, preceded the appearance of the race of mammifers. The generation of reptiles then reigned supreme upon the earth.
On the east side, masses of conglomerate rock are strewn in wild confusion. By the action of untold ages the connecting cement is worn away from between the pebbles, leaving them prominent; and wherever the attrition of the sea has loosened one from its bed, the hollow has become the habitation of Mollusca and Algae. Beyond that ponderous boulder are many dark recesses among the overlying stones.
But the same may be said of every single arthropod and annelid if it be meant that all these organs are not contained in every possible slice. While if it be meant that parts of all such organs are contained in certain slices, then some of the mollusca may also be included. Another objection to Mr.
So prolific are the mollusca of the Placuna, that the quantity of shells taken by the licensed renter in the three years prior to 1858, could not have been less than eighteen millions. They delight in brackish water, and on more than one recent occasion, an excess of either salt water or fresh has proved fatal to great numbers of them. The young brood or spat. 3. Four months old. 4.
I think, considering the organisation of these mollusca and crustacea, and looking at their very complex nature, that it does indeed require a very strong imagination to conceive that these were the first created of all living things.
It moves slowly along the bottom in search of its food, which consists of crustacea and mollusca, and seems to be unable to catch fishes or other quickly moving animals. Specimens have been taken near Ceylon, of six feet in width. Like most deep-sea fishes, the ray has a wide geographical range, and occurs not only in all the Indian Ocean, but also in the tropical tracts of the Atlantic.
No place could be more convenient for the observation of the Mollusca and Radiata than Cape Venus. At a few hundred paces from the shore is a coral reef, which at low water is completely dry. In the shoal water, between the reef and the shore, is found the greatest variety of the more brittle kinds of coral, and among their sometimes thick bushes, mollusca and echinodermes lie concealed.
In this case, the palaeontologist is called upon suddenly to intercalate about 800 species of Mollusca and Radiata, between the fauna of the Lower Lias and that of the Middle Trias. The period in question was previously believed, even by many a philosophical geologist, to have been comparatively barren of organic types.
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