2 34 



LANGDON. 



DESCRIPTION OF PLATE XIV. 



A chart showing the distribution of the sense-organs. This chart was prepared 

 by camera drawings of characteristic metameres from the removed cuticula of one 

 worm. The metameres are numbered along the mid-dorsal line. The jagged 

 edge represents the mid-ventral line. The metameres are separated by heavy 

 black lines which represent the intersegmental grooves. In each metamere the 

 small black dots represent the cuticular spots over the sense-organs, the double 

 circles the nephridial pores, and the pairs of black rectangular spots the cuticular 

 sheaths of the setae. The chart was drawn to a scale of i dm. for 2 mm. In the 

 plate it is very much reduced. 



