Lectures on the Comparative Anatomy and Physiology of the Invertebrate Animals

abdomen alimentary canal analogous anellids animal animalcules antennæ aperture appendages attached bivalve body branchial Bryozoa calcareous cavity cells cephalic Cephalopods Cestoidea character chord chylaqueous ciliated colour consists Crustacea developed digestive dilated distinct dorsal duct Edition eggs Ehrenberg elongated embryo Entozoa external extremity female fibres filaments fluid ganglion Gastropods gemmation Genera genus germ-cells germ-mass germinal vesicle gills glands head Hydra Hydrozoa impregnated individuals Infusoria insects integument intestine jointed larva larvæ layer lobes locomotive longitudinal male mantle margin mass maxillæ Medusa membrane metamorphoses minute mouth muscles muscular Nautilus nerves nervous system observed oesophagus organisation organs orifice ovaria ovarium ovicapsules oviduct oviparous ovum pair parasitic plates Polygastria polypes posterior processes respiratory Rotifera rudimental segments shell side Siebold slender species spermatozoa spontaneous fission stomach structure suckers surface tentacles tentacula terminal testis thorax tissue transverse Trematoda tube tunic valve vascular ventral vesicle vessels vibratile vols worm yolk