340 GLOSSARY. 



NATJ'TI-LOID*. Resembling the shell of the Nautilus in shape. 



NECH-O-CAL'Y-CES. 



NECH-O-CA'LYX (Gr. necho, I swim; kalux, cup). The swimming-bell 01 

 " disc" of a Medusa or Jelly-fish. 



NEM-A-TEL'MI-A (Gr. nema, thread ; helmins, a worm). The division of Scale- 

 cida comprising the Bound-worms, Thread-worms, etc. 



NE-MAT'O-CYSTS (Gr. n'ema, thread ; kustis, a bag). The thread-cells of the 

 Ccelenterata. (See Cnidae.) 



NEM-A-TO'DA. 



NEM-A-TOID'E-A (Gr. n'ema, thread; eidos, form). An order of Scolecida com- 

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



NE-MAT'O-PHORES (Gr. nema, thread : phero, I carry). Caecal processes found 

 on the coenosarc of certahi of the Sertularida, containing numerous thread- 

 cells at their extremities. 



NE-MER'TI-DA (Gr. Nemertes, proper name). A division of the Turbellarian, 

 Worms, commonly called " Ribbon-worms." 



NEBV'UBES (Lat. nervus, a sinew). The ribs which support the membranous 

 wings of insects. 



NEU'BAL (Gr. neuron, a nerve). Connected with the nervous system. 



.NEU-RA-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. 



.NEUB-O-PO'DI-UM (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-BOP'TE-RA (Gr. neuron, ; and pteron, a wing). An order of Insects charac- 

 terized by four membranous wings with numerous reticulated nervures 

 (e. g., Dragon-flies). 



NEU'TEB (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. 



NOC-TUB'NAL (Lat. nox, night). Applied to animals which are active by night. 



NOB'MAL (Lat. norma, a rule). Conforming to the ordinary standard. 



NO-TO-BRANCH-I-A'TA (Gr. notos, the back ; and bragchia, gills). Carrying the 

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



NO'TO-CHOBD (Gr. notos, back ; cTiorde, 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-UM (Gr. 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." 



NU'CLE-A-TED. Possessing a nucleus or central particle. 



ND-CLE'O-LUS. 1. The minute solid particle in the ulterior of the nucleus of 

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

 the u nucleus," or ovary, of certain Infusoria, performing the functions of 

 a testicle. 



NU'OLE-US (Lat. nucleus, a kernel). 1. The solid or vesicular bodv found in 

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

 of many of the Protozoa, and having, in certain of them, the functions of 

 an ovary. 3. The " madreppriform tubercle" of the EcJiinodermata. 4. 

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

 in many of the Mollusca. 



NC-DI-BRANCH-I-A'TA (Lat. nudus, naked; and Gr. bragchia, gills). An order 

 of the Gasteropoda in which the gills are naked. 



NYMPHS. The active pupse of certain Insects. 



OC-CIP'I-TAL. Connected with the occiput, or the back part of the head. 

 O-CE-AN'IO. Applied to animals which inhabit the open ocean ( = pelagic). 

 O-CEL'LI (Lat. diminutive ofoculus, eye). The simple eyes of many Echino- 

 derms, Spiders, Crustaceans, Molluscs, etc. 



