female glowworm, cf. Paligenesis, Caenogenesis, Paedo- 

 genesis. 



Neotropical 



See Neogea. 



Nephometer 



An instrument for measuring the percentage of sky that 

 is overcast. 



Nephoscope 



An instrument for measuring the direction and speed of 

 the movement of clouds. 



Neritic 



Refers to the portion of the sea lying above the conti- 

 nental shelf, usually to a depth of 200 meters, cf. Oceanic 

 province, Pelagic, Littoral, Sub littoral. 



Nested Quadrats 



An arrangement of placing Quadrats in one area so that 

 the size of the area sampled becomes progressively larger, 

 to determine the proper size of quadrat to use for the par- 

 ticular kind of vegetation. 



Net-Assimilation Rate 



The rate of increase in dry weight of the whole plant in 

 relation to the unit leaf-area or unit leaf-rate. 



Neural 



Refers to the nervous system or to a nerve. 



Neuston 



The organisms in a collective sense that are associated 

 with or dependent upon the surface film of water, e. g., 

 mosquito larvae. 



Neutralism 



The occurrence of two or more populations in an area 

 and neither influences the other. 



236 



