383 GLOSSARY. 
LEPIDOPTERA (Gr. lepis, a scale; pteron, a wing). An order of Insects, com- 
prising Butterflies and Moths, characterised by possessing four wings which 
are usually covered with minute scales. 
LEPIDOSIREN (Gr. lepis, a scale ; seirén, 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. 
LepT2£NA (Gr. leptos, slender). A genus of Brachiopods. 
LINGULA (Lat. lingula, a little tongue). A genus of Brachiopods. 
LYCOPODIACEH (Gr. lupos, a wolf; pous, foot). The group of Cryptogamic 
plants generally known as ‘‘ Club-mosses.” 
MACHH#RACANTHUS (Gr. machaira, a sabre; acantha, thorn or spine). An ex- 
tinct genus of Fishes. 
MACHAIRODUS (Gr. machaira, a sabre ; odous, tooth). An extinct genus of 
Carnivora. 
MACROTHERIUM (Gr. makros, long; thérion. beast). An extinct genus of 
Edentata. 
Macroura (Gr. makros, long; owra, tail). A tribe of Decapod Crustaceans with 
long tails (¢.9., the Lobster, Shrimp, &c.) 
MAMMALIA (Lat. mama, 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 which the viscera are protected. Techni- 
cally called the ‘‘ pallium.” 
Manus (Lat. the hand). The hand of the higher Vertebrates. 
MARSIPOBRANCHIL (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 the 
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; saura, lizard). A genus of Deinosaurian 
Reptiles. 
MEGATHERIUM (Gr. megas, great; thérion, beast). An extinct genus of 
Edentata. 
MEsozoIc (Gr. mesos, middle ; and zoe, life). The Secondary period in Geology. 
MICROLESTES (Gr. mikros, little ; léstes, thief). An extinct genus of Triassic 
Mamunals, 
a ee (Lat. mille, one thousand ; porus, a pore). A genus of ‘‘ Tabulate 
orals.” 
MIOCENE (Gr. meion, less; kainos, new). The Middle Tertiary period. 
Motrars (Lat. mola, a mill). The ‘‘ grinders” in man, or the teeth in diphyo- 
dont Mammals which are not preceded by milk-teeth. 
Mo.uusca (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. 
Mo.tuuscoipa (Mollusca ; Gr. eidos, form). The lower division of the Mol- 
lusca, comprising the Polyzoa, Tunicata, and Brachiopoda. 
MonocraPtus (Gr. monos, single ; grapho, I write). A genus of Graptolites. 
MYLoDon (Gr. mulos, a mill; odows, tooth). An extinct genus of Edentate 
Mammals. 
MyRrrapopa or Myrropopa (Gr. murios, ten thousand ; podes, feet). A class 
of Arthropoda comprising the Centipedes and their allies, characterised by 
their numerous feet. 
