388 GLOSSARY. 



LEPIDOPTERA (Gr. lepis, a scale ; pteron, a wing). An order of Insects, coir- 

 prising Butterflies and Moths, characterised by possessing four wings which 

 are usually covered with minute scales. 



LEPIDOSIREN (Gr. lepis, a scale ; seiren, a siren the generic name of the Mud- 

 eel or Siren lacertina). A genus of Dipnoous fishes, comprising the " Mud- 

 fishes." 



LEPIDOSTROBUS (Gr. lepis, a scale ; strobilos, a fir-cone). A genus founded on 

 the cones of Lepidodendron. 



LEFTJENA (Gr. leptos, slender). A genus of Brachiopods. 



LINGULA (Lat. lingula, a little tongue). A genus of Brachiopods, 



LYCOPODIACE^B (Gr. lupos, a wolf ; pous, foot). The group of Cryptogamic 

 plants generally known as "Club-mosses." 



MACH^RACANTHUS (Gr. mackaira, a sabre; zcantha, thorn or spine). An ex- 

 tinct genus of Fishes. 

 MACHAIRODUS (Gr. machaira, a sabre ; odous, tooth). An extinct genus of 



Garni vora. 

 MACROTHERIUM (Gr. makros, long; thenon. beast). An extinct genus cf 



Edentata. 

 MACRURA (Gr. makros, long ; oura, tail). A tribe of Decapod Crustaceans with 



long tails (e.g., the Lobster, Shrimp, &c.) 

 MAMMALIA (Lat. mamma, the breast). The class of Vertebrate animals which 



suckle their young. 

 MANDIBLE (Lat. mandibulum, a jaw). The upper pair of jaws in Insects ; also 



applied to one of the pairs of jaws in Crustacea and Spiders, to the beak of 



Cephalopods, the lower jaw of Vertebrates, &c. 

 MANTLE. The external integument of most of the Mollusca, which is largely 



developed, and forms a cloak in v/hich the viscera are protected. Techni- 

 cally called the " pallium." 



MAN us (Lat. the hand). The hand of the higher Vertebrates. 

 MARSIPOBRANCHII (Gr. marsipos, a pouch ; bragchia, gill). The order of 



Fishes comprising the Hag-fishes and Lampreys, with pouch-like gills. 

 MARSUPIALIA (Lat. marsupium, a pouch). An order of Mammals in which tho 



females mostly have an abdominal pouch in which the young are carried. 

 MASTODON (Gr. mastos, nipple ; odous, tooth). An extinct genus of Elephant- 

 ine Mammals. 

 MEGALONYX (Gr. megas, great ; onux, nail). An extinct genus of Edentate 



Mammals. 

 MEGALOSAURUS (Gr. megas, great ; saara, lizard). A genus of Deinosaurian 



Reptiles. 

 MEGATHERIUM (Gr. megas, great ; therion, beast). An extinct genus of 



Edentata. 



MESOZOIC (Gr. mesos, middle ; and zoe, life). The Secondary period in Geolo.ory. 

 MICROLESTES (Gr. mikros, little ; lestes, thief). An extinct genus of Triassic 



Mammals. 

 MILLEPORA (Lat. mille, one thousand ; porus, a pore). A genus of " Tabulate 



Corals." 



MIOCENE (Gr. melon, less ; kainos, new). The Middle Tertiary period. 

 MOLARS (Lat. mola, a mill). The " grinders" in man, or the teeth in diphjo 



dont Mammals which are not preceded by milk-teeth. 

 MOLLUSCA (Lat. mollis, soft). The sub-kingdom which includes the Shell-fish 



proper, the Polyzoa, the Tunicata, and the Lamp-shells ; so called from the 

 generally soft nature of their bodies. 



MOLLUSCOIDA (Mollusca ; Gr. eidos, form). The lower division of the Mol- 

 lusca, comprising the Polyzoa, Tunicata, and Brachiopoda. 

 MONOGRAPTUS (Gr. monos, single ; yrapho, I write). A genus of Graptolites. 

 MYLODON (Gr. mulos, a mill ; odous, tooth). An extinct genus of Edentate 



Mammals. 



MYRIAPODA or MYRIOPODA (Gr. murios, ten thousand ; podes, feet). A class 

 ot Arthropoda comprising the Centipedes and their allies, characterii-ed by 

 their numerous feet. 



