Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . Dictyocha. Actinocyclus, bivalve. their flinty armour resem-bling a minute bivalve shell:in some, as the Navicula, ithas the form of an elongatedcase, or flattened cylinder,open at both extremities {fig. 8.) : it is sometimes straight, some-times bent, like the Australian boomerang; it may present the formof a reticulated cone {fig. 9.), or a discoid case{fig. 10.): in short, thevarieties of the siliceousshells of the Infusoriaare as numerous as thoseof the calcareous s
Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . Dictyocha. Actinocyclus, bivalve. their flinty armour resem-bling a minute bivalve shell:in some, as the Navicula, ithas the form of an elongatedcase, or flattened cylinder,open at both extremities {fig. 8.) : it is sometimes straight, some-times bent, like the Australian boomerang; it may present the formof a reticulated cone {fig. 9.), or a discoid case{fig. 10.): in short, thevarieties of the siliceousshells of the Infusoriaare as numerous as thoseof the calcareous shellsof the Mollusca. Butwhatever their form, thesuperficies of these delicate microscopic objects is generally sculpturedwith a beautiful, well defined, and more or less complicated pattern,which makes it easy to recognise the species, and distinguish themfrom one another. Most of these animated minims are locomotive and free ; a few, asthe VorticellcB, are attached to foreign bodies by a long and highlyirritable and contractile pedicle ; others, as the Gomphonema, areappended to the extremities of the branches of a di
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850
