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According Anat animals appear appendages Arch attached base blood body border branches branchiae canal cavity cells ciliated closely communicate composed connected consists contain cord covered described developed digestive directly distinct dorsal eggs embryos entirely envelope extend external extremity eyes Family fibres figured four ganglia ganglion Genera genital organs glands heart individuals internal intestine Isis kind lateral layer longitudinal mantle mass Milne Edwards mouth Muller's muscles muscular nature nerves nervous system numerous observed opening organs orifices ovaries pairs pass portion posterior probably regarded remarkable respiratory ring round seen segments sends separated shell short side simple single situated skin sometimes species spermatic particles stomach structure surface surrounded taken tentacles testicles transverse tube usually ventral vesicles vessels VIII walls wanting whole
Page 15 - The invertebrate animals are organized after various types, the limits of which are not always clearly defined. There is, therefore, a greater number of classes among them than among the vertebrates. But, as the details of their organization are yet but imperfectly known, they have not been satisfactorily classified in a natural manner. There are among them many intermediate forms, which make it difficult to decide upon the exact limits of various groups. The following division, however, from the...
Page vii - In the text will be found a lucid yet succinct exposition of the anatomical structure of organs, arranged as far as practicable under distinct types. The details on which this typical summary is based, are comprised in notes which are as remarkable for their erudition as for their copiousness ; indeed, the utmost care has been taken in the literature of the various subjects treated, and the student will here find the most reliable and at the same time the fullest reference to the bibliography of...
Page 423 - From the ganglion in question passes off a band of nervous substance which stretches along the slightly excavated anterior side of the trachean vesicle. Upon this band is situated a row of transparent vesicles containing the same kind of cuneiform staff-like bodies, mentioned as occurring with the Acrididze.
Page 32 - Chilodon, the nucleus is sulcated longitudinally or transversely, or even entirely divided, before the surface of the body presents any constriction. This nucleus, which is of a finely granular aspect and dense structure, retains perfectly its form when the animal is pressed between two plates of glass, and the other parts are spread out in various ways. By direct light its color appears pale yellow. It appears to lie very loosely in the parenchyma, and sometimes individuals may be observed turning...
Page 452 - Elateridae, the illumination occurs through two transparent spots situated on the dorsal surface of the prothorax. The light produced by these organs so remarkably rich in tracheae, is undoubtedly the result of a combustion kept up by the oxygen of the air of these vessels.