640 gl'oSsXry'. 



N"au'ti-loii». Eesembling the shell of the NmUlus in shape. 



Neoh-o-oal'y-ces. 



Neoh-o-oa'ltx (Gr. necho, I swim; halvx, cup). The swunming-boU or 

 " disc " of a Medusa or Jelly-flsh, 



Nem-a-tel'mi-a (Gr. iiiTna^ thread ; helmins, a worm). The division of Scole- 

 cida oomprising the Eound-worms, Thread-worms, etc. 



Ne-mat'o-otsts (Gr. iiMm^ thread ; kustis, a hag). The thread-cells of the 

 Cmlenterata. {See Cnidte.) 



Nem-a-to'da. 



Nem-a-toid'e-a (Gr. nema, thread ; eidos, form). An order of Scoleeida com- 

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



Ne-mat'o-phores (Gr. nema, thread: ^A«to, I cany). Caeoal processes found 

 on the ooenosaro of certain of the Sertularida, containing numerous thread- 

 cells at their extremities. 



Ne-mee'ti-da (Gr. Jfemertes, proper name). A division of the Turbellarian 

 Worms, commonly called " Kibbon-worms." 



NBEv'miES (Lat. nervus, a sinew). The ribs which support the membranous 

 wings of insects. 



Neii'eal (Gr. neuron, a nerve). Connected with the nervous system. 



Ned-ba-poph'y-sis (Gr. neuron, a, nerve ; apophusis, a projecting part). _ The 

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

 junction of the neural arches. 



Neue-o-po'di-tjm (Gr. neuron, a nerve ; pous, the foot). The ventral or in- 

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

 "ventral oar." 



Neu-kop'te-ba (Gr. neuron / undpferon, a wing). Ah order of Insects charac- 

 terized by four membranous wings with numerous reticulated nervures 

 («. g., Dritgon-fiies). 



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

 sex. 



Mid-i-fi-oa'tiok (Lat. nidus, a nest ; facio, I make). The building of a nest. 



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



Nob'mal (Lat. norma, a rule). Conforming to the ordinary standard. 



No.<ro-EBA»OH-i-A'TA (Gr. notos, the baokj and hragcMa, gills). Carrying the 

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



No'To-OHOED (Gr. notos, back ; chorde, string). A cellular rod which 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-cm CGr. notos, the back; and pous, the foot). The dorsal divis- 

 ion of one of the foot-tubercles or parapodia of an Annelide ; often called 

 the " dorsal oar." 



Nn'oLE-A^'ED. Possessing a nucleus or central particle. 



Ncr-oi,E'o-i.TJS. 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 Infusoria, performing the functions of 

 a testicle. 



Nn'oLB-ns (Lat. nucleus, 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 Protoaoa, and having, in certain of tnem, the functions of 

 an ovary. 3. The " madreporifoi-m tubercle" of the SeMnodermaia. i. 

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

 in many of the Mollusaa. 



Nu-di-ebanch-i-a'ta (Lat. nudus, naked ; and Gr. Iragcliia, giUs). An order 



of the Gasteropoda in which the gills are naked. 

 Nymphs. The active pupae of certain Insects. 



Oo-crp'i-TAL. Connected with the occiput, or the back part of the head. 

 O-OE-AU'ic. Applied to animals which inhabit the open ocean (= pelagic). 

 0-oel'u (Lat. diminutive oioaulus, eye). The simple eyes of many Eohino- 

 derms, Spiders, Crustaceans, Molluscs, etc. 



