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alimentary canal animal aperture appearance Applied arms attached birds blood body bones buds called canal carry cavity central chamber characters cilia common completely composed comprising condition connected consists constitute contained covered developed digestive distinct distinguished divided division essential examples existence external extremely eyes fact feet fins fishes fixed foot four functions furnished gills Give head heart higher included inhabit insects jointed kind known leading legs length less limbs living lower Mammals means membranous mouth nature nervous system never opens organs pair placed plates points polypite possess present produced pupa regarded reproductive respiratory segments separate shape shell short showing side simple single skeleton skin sometimes species stomach structure surface tail teeth tentacles termed toes true tube upper usually Vertebrates whole wings young
Page 4 - Rolleston, whilst questioning the propriety of this step, is forced to conclude that " there are organisms which at one period of their life exhibit an aggregate of phenomena such as to justify us in speaking of them as animals, whilst at another they appear to be as distinctly vegetable.
Page 147 - Abdomen, without limbs, but carrying terminal appendages concerned in reproduction. which are usually more or less freely movable upon one another, and which never carry locomotive limbs, as is so commonly the case in the Crustacea. The extremity of the abdomen is, however, often furnished with appendages which are primarily connected with reproduction, but which are often converted into weapons of offence and defence. Of this nature are the " ovipositors " of ichneumons, the stings of bees and wasps,...