GLOSSATJT. 



485 



MANDIBLES, jaws. 



MANTLE, the soft external envelope 



of the molluscs. 

 MARGINELLA, lat., inargo, a margin, 



alluding to the outer lip ; a genus 



of shells. 

 MARL, a mixture of lime and clay, 



of various degrees of hardness. 

 MARSUPIALS, animals which carry 



their young in a pouch, as the 



kangaroo. 

 MAUSUPITE, a zoophyte, allied to 



the crinoidea, occurring in the 



chalk. 

 MASTODON, an extinct animal, allied 



to the elephant, the name being 



derived from its having tubercu- 



lated teeth, from ^aaros, a breast, 



and oSows, a tooth. 

 MATRIX, the mass or substance in 



which a fossil is embedded. 

 MECHANICAL, applied to deposits of 



sedimentary, as distinguished 



from those of igneous origin. 

 MEDULLARY, applied to the central 



pith of plants, and the vertebral 



canal of animals. 

 MEGALONYX, great-clawed animal, 



allied to the sloth. 

 MEGALOSAURUS, great lizard : an ex- 

 tinct gigantic carnivorous rep- 

 tile. 

 MEGATHERIUM, an extinct colossal 



quadruped, allied to the sloth. 

 MELANIA, black ; a genus of shells. 

 MELANOPSIS, like melania ; a genus 



of shells. 



MELEAGRINA, a guinea-fowl. 

 MELONITES, lat., melo, a melon. 



(the change in- 

 duced in strata 

 by exposure to 

 a high tempera- 

 ture. 



MICA, a simple mineral, one of the 

 component parts of granite. 



MICACEOUS, containing mica. 

 MILIOLITES, lat., milium, millet; 



forameniferous shells. 

 MIOCENE, middle tertiary strata. 

 MITRA, a mitre ; a genus of shells. 

 MODIOLA, a little measure, or bucket; 



a genus of shells. 

 MOLARES, the double or grinding 



teeth. 



MOLECULES, microscopic particles. 

 MOLLUSCA, animals with soft bodies, 



destitute of bones. 

 MONADS, the minutest infusorial 



animalcules. 

 MONITOR, a lizard, found both recent 



and fossil. 

 MONOCEROS, one-horned ; a genus of 



shells. 

 MONOCOTYLEDONOUS, a grand division 



of the vegetable kingdom, founded 



on the plant having but one coty- 

 ledon, or seed-lobe. 

 MONODONTA, one tooth ; a genus of 



shells. 

 MORAINE, an accumulation of debris 



formed in valleys by glaciers. 

 MULTILOCULAR, applied to many- 

 chambered shells, as the nautilus, 



and ammonite. 

 MULTIVALVE, shells composed of 



many pieces, as the chiton. 

 MUREX, a shell producing purple ; 



genus of shells. 

 MUSCHELKALK, a shelly limestone of 



the triasic system. 

 MYA, a mussel ; a genus of shells. 

 MYTILUS, for a kind of mussel ; a 



genus of shells. 



N. 



NACREOUS, pearly. 



NATICA, adapted for sailing; a genus 



of shells. 

 NAUTILUS, lat., nauta, a sailor; a 



genus of shells. 



