380 GLOSSARY. 



Nau'ti-loii>. Eesemblins the shell of the Nautilus in shape. 



Nech-o-cal'y-ces. 



Nech-0-ca'lyx (Gr. ttecJio^ I swim; kalux^ cup). The Rwimming-bell oi 

 " disc" of a Medusa or Jelly-fish. 



Nem-a-tel'mi-a (G-r. nema^ thread ; helinhis, a worm). The division of Scale- 

 cida comprising the Eound-worius, Thread-worms, etc. 



Ne-mat'o-cysts (Gr. iLema, thread; hustis^ a bag). The thread-cells of the 

 Cmlenterata. {See Cuidui. ) 



Nem-a-to'da. 



Nem-a-toid'e-a (Gr. n^?7ia, thread; eidos^ form i. An order of Scoleclda com^ 

 _ prising the Thread-worms, Vinegar-eels, etc. 



Ke-mat'o-phoees (Gr. nema^ thread • ^7ifrc, I carry). Ctccal processes found 

 on the ccenosarc of certain of the Siiftularida^ containing numerous thread- 

 cells at their extremities. 



Ne-mek'ti-da (Gr. Nemertes, proper name). A division of the Tarhellarian 

 Worms, commonly called " Ribbon-worms." 



Nerv'ures (Lat. nervus, a sinew). The ribs which support the membranous 

 wings of insects. 



Neu'ral (Gr. neuron, a nerve). Connected with the nervous system. 



JN'eu-ra-poph'y-sis (Gr. neuron^ a nerve ; apopJmsis^ a projectmg part). The 

 "■spinous process" of a vertebra, or the process formed at the point ot 

 junction of the neural arches. 



J!^eue-o-po'di-um (Gr. neuron, a nerve; po^is, the foot). The ventral or in- 

 ferior division of the "foot tubercle" of an Annelide; often called the 

 "ventral oar." 



Neu-rop'te-ra (Gr. neuron ; and pferon, a wing). An order of Insects charac- 

 terized by four membranous wings with namerous reticulated nervures 

 Je. g.^ Drngou-flies). 



Neu'ter (^Lat. for neither the one nor the other). Having no fully-developed 

 sex. 



Nid-i-fi-ca'tion (Lat. nidus^ a nest ; facio, I make). The building of a nest. 



Noo-tur'nax (Lat. nox, night). Applied to animals which are active by night. 



Nor'mal (Lat. norma, a rule). Conforming to the ordinary standard. 



No-to-branch-i-a'ta (Gr. notos, the back ; and bragchia, gills). Cariying the 

 gills upon the back ; applied to a division of the Annelida. 



Nu'To-CHOKD (Gr. notos^ back ; chorde^ string). A cellular rod wliich is devel- 

 oped in the embryo of Vertebrates immediately beneath the spinal cord, 

 and which is usually replaced in the adult by the vertebral column. Often 

 it is spoken of as the " chorda dorsalis." 



No-to-po'di-um cGr. notos, the back; and pons, the foot). The dorsal divis- 

 ion of one of the foot-tubercles 'or parap<:idia of an Aiiiwlide ; often called 

 the " dorsal oar." 



Nu'cle-a-ted. Possessing a nucleus or central particle. 



Nu-CLE'o-Lus. 1. The mmute solid particle in the interior of the nucleus of 

 some cells. 2. The minute spherical particle attached to the exterior of 

 the " nucleus," or ovary, of certain Inji,iioria^ performing the functions of 

 a testicle. 



'Nl''cle-us (Lat. nucleu^?, a kernel). 1. The solid or vesicular body found in 

 many cells. 2. The solid rod, or band-shaped body, found in the interior 

 of many of the PtnAozoa, and having, in certain of tnera, the functions of 

 an ovary. 3. The "madreporiform tubercle" of the Jichinodei^iata. 4. 

 The embryonic shell which Is retained to form the apex of the adult shell 

 in many of the Molhu^ca. 



Nu-ni-BKANCH-i-A'TA (Lat. nudus, naked; and Gr. hragchia, gills). An order 

 of the G-asteropoda in which the gills are naked. 



Nymphs. The active pupie of certain Insects. 



Oc-cip'i-TAL. Connected with the orcipvt. or the back part of the head. 

 0-cE-AN'io. Applied to animals which innabit the open ocean (= pelagic). 

 U-eEL'u (Lat. diminutive of oouluft eye). The simple eyes of many Hichino 

 derms, Spiders, Crustaceans, Molluscs, etc. 



