A Manual of the Mollusca Or a Rudimentary Treatise of Recent And Fossil Shells
A Manual of the Mollusca Or a Rudimentary Treatise of Recent And Fossil Shells
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In our eReader you can find the full English version of the book. Read A Manual of the Mollusca Or a Rudimentary Treatise of Recent And Fossil Shells Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Manual of the Mollusca Or a Rudimentary Treatise of Recent And Fossil Shells
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Instead of creeping, they swim with a pair of ciliated fins springing from the sides of the head ; and by this means are often more widely dispersed than we should be led to expect from their adult habits ; thus some sedentary species of calyptraa and chiton have a greater range than the " paper-sailor, " or the ever-drifting ( oceanic-snail.
At this stage, which may fairly be compared with the larval condition of insects, there is scarcely any difference between the young of eolis and aplysia,... or buccinum and vermetus. (M. Edw. ) The development of the branchiferous gasteropods may be observed with much facility in the common river-snails (paludina] ; which are viviparous, and whose oviducts in early summer contain young in all stages of growth some being a quarter of an inch in diameter.
Fig. GO. T Fig. 61. Paludina vivipara. % Embryos scarcely visible to the naked eye have a well-formed shell, orna- mented with epidermal fringes ; a foot and operculum ; and the head has long delicate tentacula, and very distinct black eyes.
What to read after A Manual of the Mollusca Or a Rudimentary Treatise of Recent And Fossil Shells?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Peckworth Woodward to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Instead of creeping, they swim with a pair of ciliated fins springing from the sides of the head ; and by this means are often more widely dispersed than we should be led to expect from their adult habits ; thus some sedentary species of calyptraa and chiton have a greater range than the " paper-sailor, " or the ever-drifting ( oceanic-snail.
At this stage, which may fairly be compared with the larval condition of insects, there is scarcely any difference between the young of eolis and aplysia,... or buccinum and vermetus. (M. Edw. ) The development of the branchiferous gasteropods may be observed with much facility in the common river-snails (paludina] ; which are viviparous, and whose oviducts in early summer contain young in all stages of growth some being a quarter of an inch in diameter.
Fig. GO. T Fig. 61. Paludina vivipara. % Embryos scarcely visible to the naked eye have a well-formed shell, orna- mented with epidermal fringes ; a foot and operculum ; and the head has long delicate tentacula, and very distinct black eyes.
What to read after A Manual of the Mollusca Or a Rudimentary Treatise of Recent And Fossil Shells?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Peckworth Woodward to read onlineMoreLess
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