VERMES THE WORMS 



99 



Although by no means common on our shores, it may 

 occasionally be found on digging among oozy sand and 

 gravel at the edge of Zostera banks, also among loose 



Fig. 38 

 Tertbella conchilega, and its tube, f Natural size 



stones in rock crevices where there is silt inter- 

 mixed. 



It constructs a tube of very frail consistency, fragments 

 of shell and fine gravel loosely held by a thin mucilage. 



