218 



ENDEAVOUR SCIENTIFIC RESULTS. 



VARIATION IN GILLS IN E. pycnobranchiata. 



Numbers in brackets indicate that in their area of maximum develop- 

 ment these numbers occur on occasional segments irregularly : (imp.) 

 indicates that the worm is incomplete posteriorly. 



VARIATIONS IN OTHER ORGANS IN E. pycnobranchiata. 



h = hard, well preserved. s = soft, ill preserved. 



imp. = incomplete posteriorly. 



Nos. 1-5, Maria Island ; 6, 12, Babel Island ; 7, Cape Jervis ; 8, Stores 

 Bay; 9, Circular Head; 10, New South Wales coast; 11, north-east 

 Babel Island. 



1. The number of gill filaments is occasionally only five. 



2. The number of gill filaments rises to seven on segment xc., it is eight 

 at c ; and then decreases to five at cxxx, and gradually dies out. 



3. On the two sides. 



