The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Results 1-5 of 26
Page 44
... anus ; on the other hand , in the larva of Alcyonidium we have a stomach of yolky cells , an almost occluded œsophagus , and no intestine , whilst in that of Bugula the whole mesoderm and endoderm is repre- sented by a solid mass of ...
... anus ; on the other hand , in the larva of Alcyonidium we have a stomach of yolky cells , an almost occluded œsophagus , and no intestine , whilst in that of Bugula the whole mesoderm and endoderm is repre- sented by a solid mass of ...
Page 44
... anus . Sedgwick's suggestion , however , that mouth and anus were differentiated from a slit - like blastopore , seems to answer this difficulty . That a slit - like opening can be represented by two independent perforations is shown by ...
... anus . Sedgwick's suggestion , however , that mouth and anus were differentiated from a slit - like blastopore , seems to answer this difficulty . That a slit - like opening can be represented by two independent perforations is shown by ...
Page 44
... anus has , so far as I know , not been suggested before . I agree with Hæckel in regarding the blastopore as homologous with the primitive mouth of the gastræa . I have attempted to explain the peculiar behaviour of the blastopore in a ...
... anus has , so far as I know , not been suggested before . I agree with Hæckel in regarding the blastopore as homologous with the primitive mouth of the gastræa . I have attempted to explain the peculiar behaviour of the blastopore in a ...
Page 44
... anus found in most of the higher groups ( Vermes , Mollusca , Arthropoda and in all probability Vertebrata ) have been derived from the mouth of an ancestor common to them and the Cœlenterata ; i . e . from an elongated opening such as ...
... anus found in most of the higher groups ( Vermes , Mollusca , Arthropoda and in all probability Vertebrata ) have been derived from the mouth of an ancestor common to them and the Cœlenterata ; i . e . from an elongated opening such as ...
Page 44
... On the Original Function of the Canal of the Central Nervous System of the Vertebrata , " Proc . of Cambridge Phil . Soc . , ' vol . iv . 6 ON THE HOMOLOGY OF THE MOUTH AND ANUS WITH THE ORIGIN OF METAMERIC SEGMENTATION . 7.
... On the Original Function of the Canal of the Central Nervous System of the Vertebrata , " Proc . of Cambridge Phil . Soc . , ' vol . iv . 6 ON THE HOMOLOGY OF THE MOUTH AND ANUS WITH THE ORIGIN OF METAMERIC SEGMENTATION . 7.
Common terms and phrases
acquired characters Actinozoa adult alimentary Amphioxus Anatomy ancestral Annelid ants appear archenteron assume become blastopore body Burchell's zebra carapace-length cavity changes chromatin cœlom colour connection corpuscles degeneration dentary derived deviation differentiation diploblastic disuse division ectoderm eggs embryo essay evolution excretory existence explanation fact females fibres formation frontal breadth germ germ-plasm growth homologous horse hybrid hypothesis important insects instance instincts larva larvæ legs less males mare mean mesoblast Metazoa modified morphological mouth and anus natural selection nephridia nervous system neural canal nucleus number of glands nutrition observations occur ontogeny organs origin ovum Panmixia Peripatus plants plasm pores pouches present primitive streak principle produced Professor Weismann protoplasm recognised regard reproductive cells result Schwann Sedgwick segmentation nucleus segmented animals somites specialised species Spencer stage structure substance supposed telegony theory tion tissues unicellular variability variations Vertebrata Vertebrate workers yolk zebra
Popular passages
Page 65 - The elementary parts of all tissues are formed of cells in an analogous, though very diversified manner, so that it may be asserted, that there is one universal principle of development for the elementary parts of organisms, however different, and that this principle is the formation of cells.
Page 7 - XVIII. OF THE SCHEMATISME OR TEXTURE OF CORK, AND OF THE CELLS AND PORES OF SOME OTHER SUCH FROTHY BODIES...
Page 72 - PROCESSES, AND COLLATERAL INFORMATION IN THE ARTS, MANUFACTURES, PROFESSIONS, AND TRADES, INCLUDING MEDICINE, PHARMACY, AND DOMESTIC ECONOMY ; designed as a General Book of Reference for the Manufacturer, Tradesman, Amateur, and Heads of Families.