_Hastate._ Formed like an arrow-head. _Haustellate._ Insects with a mouth adapted for suction. _Herbivorous._ Feeding on grass. _Hexapod._ Having six legs. _Hyaline._ Glassy. _Ichthyology._ A description of fishes. _Imbricated._ Tiled, or lying over each other. _Incubation._ The act of hatching eggs. _Insectivorous._ Feeding on insects. _Intestinal._ Pertaining to the digestive organs. _Laminated._ Covered with or divided into plates or scales. _Larva._ The young of insects. _Lateral._ Belonging to the side, placed sideways. _Loricated._ Covered with hard scales or plates like armour._Lunate._ Crescent-shaped. _Mandibles._ Upper and lower, the two divisions of a bird’s beak, or the projecting jaws of an insect. _Migratory._ Coming and going at certain seasons. _Multivalve._ With many shells or openings. _Nacreous._ Resembling mother-of-pearl. _Nictitating._ Winking; applied to a membrane with which birds cover their eyes at pleasure. _Olfactory._ Relating to smell. _Operculum._ A shield or cover. _Ornithology._ A description of birds. _Oviparous._ That lays eggs. _Palmated._ Webbed. _Parasitic._ Attached to and dependent on some other living body. _Parturition._ The act of bringing forth young. _Passerine._ Belonging to the sparrow tribe. _Pectinate._ Resembling a comb. _Pectoral._ Belonging to the breast. _Pendulous._ Hanging down. _Piscivorous._ Feeding on fishes. _Plicate._ Folded. _Predaceous._ Formed to pursue prey. _Prehensile._ Capable of grasping. _Quadrifid._ Divided into four parts. _Quadruped._ Four-footed. _Ramose._ Branching. _Reptiles._ Animals of the serpent tribe, with legs. _Rudimentary._ Small; imperfectly developed. _Ruminating._ Chewing the cud. _Scabrous._ Rough. _Scapulars._ Shoulders. _Semilunar._ In the form of a half-moon. _Serrated._ Notched like a saw. _Sessile._ Attached without the intervention of a stalk. _Setaceous._ Having bristles or strong hairs. _Spiral._ Winding like a screw. _Squamose._ Scaly. _Striated._ Streaked or striped. _Subulated._ Formed like an awl. _Sulcated._ Furrowed. _Suture._ The line of junction of two hind parts. _Tentacula._ The feelers of snails and other mollusca. _Testaceous._ Covered with a shell, as oysters. _Trifurcated._ Three-forked.