GLOSSARY. 445 



Marin R, beloncjing to the sea. Lat. mare, the sea. 



Marsupia'ta, ail order of mammalia coutaiuiiig tlie marsupial 

 or pouched animals. Lat. marsupium, a pouch. 



Mausoleum, a sepulchral building. The name is derived from 

 one of extraordinary magniticence erected 353 B.C. to the 

 memory of Mausoleus, king of Caria. 



Maxillae, the jaws. In entomology, the term is applied to the 

 lower jaws of insects. 



Medullary, resembling marrow, Lat. medulla, marrow. The 

 term is used in speaking of the substance that unites the 

 various parts of the sertularian Zoophytes into one living 

 mass. — Vide " Sertularian." 



Megatherioid Ammals, a croup consisting of extinct species 

 of the order Edentata. The name is derived from one of 

 colossal size, the Megatherium. Gr.megas, great, and therion, 

 a beast. 



Membranous, consisting of membrane. 



Metamorphosis, transformation; change of shape. The word 

 is taken from the Greek. 



Microscopic, visible only by means of a microscope or mag- 

 nifying glasses. 



Migration, change of residence; removal from one locality to 

 another. The term is applied to those periodical changes of 

 abode observable in many species of bu-ds and other animals. 



AliLLiPEDES, insects possessed of numerous legs, and belonging 

 to the order Myriapoda. 



Milt, the soft roe or spawn of the male fish; it is used to fecun- 

 date the pea or roe of the female. 



Molars, the grinding teeth. Lat. molaris, grinding. 



Molecules, a term derived from the French, and expressing 

 very minute particles of matter. 



Mollusca, one of the great groups into which the animal 

 kingdom is divided. It contains the soft-bodied animals 

 popularly known as " shell-fish." Lat. mollis, soft. 



Monad, an atom that admits of no further subdivision. Gr. 

 monas, a unit. 



Monograph, a written description of a single thing, or class 

 of things. Gr. monos, one. and grapho, 1 write. 



Moulting, the periodical change tliat takes place in the plu- 

 mage of birds. 



Mucus, slime, or slimy matter. 



MuLTiVALVE, a term applied to shells which (like the Chiton) 

 consist of more than two valves. 



Myria'poda, an order of insects consisting of those which (like 

 the Centipede and Millipede) have numerous feet. Gr. 

 myroi, ten thousand, innumerable, and pous, a foot. 



Natato'RES, the order of swimming birds. Lat. nato, I swim. 



Neuroptera, an order of four-winged insects, in which what 

 are termed the " ncrvures " of the wings are so disposed as to 

 form a kind of network (as in the L)ragou-tly). Gr. neur<nif 

 a nerve, and pteron, a wing. 



