_Abdomen._ The part of the body containing the organs of digestion. _Abdominal._ Pertaining to the abdomen. _Amphibious._ Capable of living both on the land and in the water. _Animalcules._ Small animals, visible only with the assistance of the microscope. _Annulated._ Marked with rings. _Antennæ._ The horns or feelers of insects. _Apex._ The top or summit of anything. _Apical._ Situated at, or belonging to, the apex. _Apodal._ Footless. _Apterous._ Wingless. _Aquatic._ Living or growing in the water. _Bicuspid._ Having two points. _Bifid._ Divided into two parts. _Bifurcated._ Divided into two prongs. _Bisulcous._ Cloven-hoofed. _Bivalve._ With two shells. _Branchiæ._ Gills, or organs for aquatic respiration. _Buccal._ Pertaining to the mouth. _Byssus._ A tuft of silky filaments produced by some Mollusca. _Callosity._ A hard lump, an excrescence. _Campanulate._ Bell-shaped. _Canine._ Of the dog kind. _Carinated._ Keeled. _Carnivorous._ Feeding on flesh. _Caudal._ Pertaining to the tail. _Cere._ A skin over the base of the bill of birds._Cervical._ Belonging to the neck. _Cetaceous._ Of the whale kind. _Cilia._ Microscopic filaments, which, by their constant vibration, either cause currents in the water, or move the animals possessing them. _Cinereous._ Of the colour of ashes. _Clavate._ Clubbed. _Cordiform._ Heart-shaped. _Coriaceous._ Leathery. _Corneous._ Horny. _Crustaceous._ Covered with a shell or crust; as lobsters, crabs, &c. _Dentate._ Toothed like a saw. _Dorsal._ Belonging to the back. _Elytra._ The wing-cases of insects of the beetle tribe. _Emarginate._ Notched. _Entomology._ A description of insects. _Exsanguineous._ Without red blood, as worms. _Feline._ Belonging to the cat kind. _Ferruginous._ Of an iron or rust colour. _Filiform._ Thread-like. _Foliaceous._ Leaf-like. _Frugivorous._ Feeding on fruits. _Furcated._ Forked. _Fusiform._ Spindle-shaped. _Gallinaceous._ Belonging to the hen kind. _Gelatinous._ Like jelly. _Gemmiparous._ Capable of propagating by buds. _Geniculate._ Bent like a knee. _Gestation._ The time of going with young. _Granivorous._ Feeding on grain. _Gregarious._ Associating together.