88 GLOSSARY. 



Myria'poda (Gr. murios, countless ; pous, podos, a foot). A 

 division of the Arthropoda which comprises the centipedes, 

 millipedes, &c. 



Myxas'trum (Gr. muxa, mucus ; aster, a star). A genus of 

 the Monera. 



My'xinoid (Gr. myxine, from muxa, mucus, the glutinous hag). 

 A family of the Marsipobranchii, of which the hag is a 

 type. 



Myx'opods (Gr. mttxa, mucus ; potts, pMos, a foot). A term 

 applied to those Protozoa which possess pseudopodia. 



Myxospon'giae (Gr. muxa, mucus; spongia, a sponge). The 

 name given to those sponges which are devoid of a skeleton. 



Myzosto'mata (Gr. mus, a muscle; stoma, stornatos, an open- 

 ing). A group of the Invertebrata, of which the only 

 genus, Myzostomum, has a muscular proboscis which can 

 be protruded through an aperture in the ventral face. 



N. 



Na'cre (an Oriental word). Mother-of-pearl. 



Na'creous. Pearly ; like mother-of-pearl. 



Na'res(L. the nostrils). The nostrils; anterior nares, the nostrils 



proper ; posterior nares, the openings of the nasal cavities 



into the pharynx. 



Na'sal (L. nasus, the nose). Relating to the nose. 

 Na smyth's mem'fcrane. A very thin membrane which covers 



the outer surface of the enamel of unworn teeth. 

 Na'tes (L. the buttocks). The anterior pair of the corpora 



quadrigemina of the brain. 

 Navlcula're or Navi'cular (L. navtcula, a small ship or boat). 



One of the bones of the tarsus, and also, according to 



one system of nomenclature, of the carpus. 

 Necro'sis (Gr. nckros, a dead body). The death of a mass of 



bone. 

 Nectoca'lyx (Gr. necho, I swim ; kalux, a cup). The cup of 



the medusoid in the Hydrozoa ; the swimming bell of a 



jelly-fish. 

 Nema'tocyst (Gr. nema, thread; kustos, a bladder). The 



thread-cell of a Hydrozoon. 

 Nematoi'dea (Gr. ncma, thread ; eidos, shape). A group of 



the Invertebrata classed by Huxley with theNcmatoscolices, 



and which comprises the thread-worms and round-worms. 



