GLOSSARY. 675 



IsoPODA. (Gr. isos, equal ; pons, a foot.) An order of Crustaceans in which the 

 feet are alike, and equal. 



Labium. Latin for a lip ; but applied only to the lower lip in Entomology. 



Labrum. Latin for a lip ; but applied only to the upper lip in Entomology. 



Lamellibraxchiata. (Lat. lamella, a plate ; bragchia, gills.) The class of ace- 

 phalous jNIollusks with gills in the form of membranous plates. 



LA3IELL1FOKM. Shaped like a thin leaf or plate. 



L-VNiARiFORM. (Lat. lanio, to cut or tear ; forma, shape.) Shaped like the canine 

 teeth of the Caruivora, which are called laniaries from their office. 



Larva. (Lat. larva, a mask.) Applied to an insect in its first active state, which 

 is genei-ally ditferent from, and as it were masks the ultimate form. Larviform, 

 shaped like a larva. 



Larviparous. (Lat. larva; pario, I produce.) The insects which produce their 

 young in the condition of larva. 



Lemniscus. (TJie Latin for riband.) Applied to the minute riband-shaped ap- 

 pendages of the generative pores in Entozou. 



Lepidoptera. (Gr. lepis, a scale ; pteron, a wing.) The order of insects in which 

 the wings are clothed with fine scales, as butterflies and moths. 



Macroura. (Gy. mafiros, long ; owra, tail.) The tribe of decapod Crustacea wdiich 

 have long tails, as the lobster. 



Malacology. (Gr. malakos, soft ; logos, discourse.) The histoiy of the soft- 

 bodied or molluscous animals, which Avere termed Malakia by Aristotle. 



Malacostraca. (Gv. malakos ; ostrakon, a, &\\q\\.^ The name given by Aristotle 

 to the modern Crustacea, because their shells were softer than those of the Mol- 

 lusca, or ordinary shell-fisb. 



Mamm^vlia. (Lat. mamma, a breast.) The class of animals which give suck to 

 their young. 



Mandibulata. (Lat. mandibula, a jaw.) The insects which have mouths pro- 

 vided Avith jaws for mastication ; the term mandible is restricted in Entomology 

 to the upper and outer pair of jaws. 



Mantle. The external soft contractile skin of the Mollusca, which covers the 

 viscera and a great part of the body like a cloak. 



Marsupial. (Lat. marsupium, a purse.) The tegumentary pouch, in which the 

 embr3'o is received after birth, and protected during the completion of its de- 

 velopment. 



Mastodon. (Gr. mastos, a teat; odon, a tooth.) A genus of extinct quadrupeds 

 allied to the ele])hant, but having the grinders covered Avith conical protuberances 

 like teats. 



Maxilla. (From the Latin for a jaw.) In Entomology restricted to the inferior 

 pair of jaws. 



Median. Having reference to the middle line of the body. 



Medulla oblongata. The oblong medullary column at the base of the brain, from 

 Avhich the spinal chord or marrow is continued. 



JMedus^. a genus or family of soft radiated animals or acalephes, so called because 

 their organs of motion and prehension are spread out like the snaky hair of the 

 fabulous Medusa. 



Mesentery. (Gr. mesos, intermediate ; and enteros, entrail.) The membrane 

 Avhich foi'ms the medium of connection between the small intestines and the 

 abdomen. 



Mesogastric. (Gr. mesos; and gaster, stomach.) The membrane Avhich forms 

 the medium of attachment of the stomach to the Avails of the abdomen. 



Mesonotum. (Gr. mesos, middle ; notos, back.) The middle piece of that half of 

 segment Avhich covers the back. 



Mesosternum. (Gr. mesos ; sternon, breast.) The middle part of that half of the 

 segment Avhich covers the breast. 



ISIesothorax. (Gr. mesos, middle ; and thorax, the chest.) The intermediate of 

 the three segments Avhich form the thorax in insects. 



Metabola. (Gr. metabole. change.) Those insects which undergo a metamor- 

 phosis. 



X X 2 



