Lectures on the Comparative Anatomy and Physiology of the Invertebrate Animals: Delivered at the Royal College of Surgeons, in 1843 |
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abdomen alimentary canal analogous Anatomy Anellides animal animalcules antennæ aperture appendages artery Ascidians attached Belemnite bivalves blood body branchiæ branchial Bryozoa calcareous cavity cells cephalic Cephalopods chords ciliated colour commencement compound eyes consists Crustacea Cuvier developed digestive dilated distinct divided dorsal duct elongated embryo Entozoa external extremity eyes female filaments fluid ganglion Gasteropods genus germinal vesicle gills glands head horny Infusoria insects integument interspace intestine jointed larva larvæ layer legs lobes locomotive longitudinal male mandibles mantle margin mass maxillæ membrane metamorphoses minute Mollusca mouth muscles muscular fibres muscular system Nautilus nerves nervous system observed ocelli œsophagus organisation organs orifice ovaria oviduct ovum pair parasitic plates polypes posterior present processes radiated respiratory rudimental segments sheath shell side siphon slender species spiders spines stomach structure surface tentacles tentacula terminal thorax tissue transverse tube tunic valves vascular veins ventral vesicle vessels visceral wings worm
Popular passages
Page 176 - With regard to the atmosphere, also, we infer that had it differed materially from its actual condition, it might have so far affected the rays of light, that a corresponding difference from the eyes of existing crustaceans, would ' have been found in the organs on which the impressions of such rays were then received. Regarding light itself, also, we learn from the resemblance of these most ancient organizations to existing eyes, that the mutual relations of light to the eye, and of the eye to light,...
Page 176 - With regard to the atmosphere,' says Dr Buckland, ' we infer that, had it differed materially from its actual condition, it might have so far affected the rays of light, that a corresponding difference from the eyes of existing crustaceans would have been found in the organs on which the impressions of such rays were then received. Regarding light itself also, we learn from the resemblance of these most ancient...
Page 75 - Jig. 72,) is situated on the ventral surface of the body at the junction of the anterior and middle thirds of the body, which is generally marked at that part by a slight constriction.
Page 30 - ... from one and the same Author of Nature. But this of the immense distance of the fixed stars, which for a long time was accounted an incredible thing, is now believed by almost all the learned. Why then should not that other, of the smallness of some bodies, become credible at some time or other? For the Majesty of God appears no less in small things than in great; and as it exceedeth human sense in the immense greatness of the universe, so also it doth in the smallness of the parts thereof.
Page 27 - ... matter upon the earth ; for when this matter is dissolved or suspended in water, in that state of comminution and decay which immediately precedes its final decomposition into the elementary gases, and its consequent return from the organic to the inorganic world, these wakeful members of nature's invisible police are everywhere ready to arrest the fugitive organised particles and turn them back into the ascending stream of animal life.
Page 367 - ... the creation, being at no stage different from some of those inferior orders; or, in other words, if we were to take a series of animals, from the more imperfect to the perfect, we should probably find an imperfect animal corresponding...
Page 32 - ... fastened at each end an apparatus which chemists employ for collecting carbonic acid; that to the left was filled with concentrated sulphuric acid, and the other with a solution of potash. By means of the boiling heat every thing living, and all germs in the flask or in the tubes, were destroyed, and all access was cut off by the sulphuric acid on the one side, and by the potash on the other.
Page 144 - ... protrude the anterior half of their body, which is remarkable for its regular, oscillating movement. Bonnet cut off the head of one of the naids of this genus, which was soon reproduced; and, when perfect, he repeated the act, and again as often as the head was reproduced. After the eighth decapitation the unhappy subject was released by death ; the execution took effect, the reproductive virtue had been worn out. Since many of the smaller kinds of naids frequently expose a part of their body,...
Page 27 - Invertebrata) their incredible numbers, their universal distribution, their insatiable voracity, and that it is the particles of decaying vegetable and animal bodies which they are appointed to devour and assimilate. Surely we must in some degree be indebted to these ever-active invisible scavengers, for the salubrity of our atmosphere. Nor is this all : they perform a still more important office in preventing the gradual diminution of the present amount of organized matter upon the earth.
Page 175 - ... perception of light to Crustaceans now living at the bottom of the sea. With respect to the waters wherein the Trilobites maintained their existence throughout the entire period of the Transition formation, we conclude that they could not have been that imaginary turbid and compound Chaotic fluid, from the precipitates of which some Geologists have supposed the materials of the surface of the earth to be derived ; because the structure of the eyes of these animals is such, that any kind of fluid...