Technical Terms. 117 
Filéform,—Resembling a thread. : 
fetus.—The young animal before it quits the body of its mother, 
Heteromerous.—Belonging to the group Heteromera—with tarsi four 
jointed on the hind legs and five jointed on the first and second 
pairs of legs. 
Hymenopterous.—Belonging to the group Hymenoptera. 
Imago,—The mature stage in the life history of an animal. 
Incisors.—A group of front teeth in Mammalia. 
Inguinal.—Connected with the groin. 
Integument.—The outer layer of the body, 
Labial.—Connected with the labium. 
Labium.—The lower lip in insects. 
Labrum.—The front or upper lip in insects. 
Larva.—The imperfectly developed stage through which many animals 
pass after leaving the egg. 
Mammary glands.—Glands_ characteristic of the Mammalia which 
secrete the milk with which the offspring is nourished for a time 
after birth. 
Mandible-—One of the front pair of jaws in Arthropoda; also the 
chief bone of the lower jaw in Vertebrata. 
Mantle.—In the Mollusca, a fold of the integument which generally 
secretes a shell. 
Maxilla,—One of the second pair of jaws in insects; also a bone in 
the upper part of the mouth in Vertebrata. 
Maatllary.—Connected with the maxilla. 
Mesothorax.—The middle segment of the thorax in insects. 
Metathorax.—The posterior segment of the thorax in insects. 
Aligratory.— Prone to wander long distances, 
Molars.—Certain back teeth in the Mammalia. 
Mucous membrane.—The slimy membrane which lines the digestive 
tract in the higher animals. 
Multicellular, —Formed of many cells. 
Nucleus.—A dense structure which is to be found in every cell. 
Occipital condyle-A bony process situated at the base of the skull: 
in Vertebrata. 
Ocelli.—Minute eyes of very simple structure possessed by many 
insects. 
Organ.—A portion of the body differentiated for the performance of 
a particular function. 
Organism,—That which is made up of organs—an animal. 
Orthopterous.—Belonging to the group Orthoptera. 
Palp.—A jointed organ attached to some of the appendages of the 
mouth in Arthopoda. 
Pectoral.—Relating to the breast. 
