Figure 20-4. Horizontal burrowing pattern of a single Nephtys 



incise as indicated by the sequence of new afferent burrow 



openings appearing on surface of large sediment-filled box 



over a period of 2 weeks {18°C). 



NOTE: Afferent opening no. 1 1 indicates most recent burrow opening. 



I 



03 



.02 .03 .04 .06 .08 .10 



30 40 



WORM WEIGHT (g) 



Figure 20-5. Relationships of size of N. incisa to burrow length 



using a flexible cm rule. 



NOTE: Each vertical bar represents the range of 4-7 observations of a single 

 worm of the indicated weight. N = 7 worms. 



310 



