ON ANTHURA GRACILIS (MONTAGU). 



237 



appearance was so deceptive to the eye that they might easily be mis- 

 taken at a rough glance for the anterior region of the original occupant 

 of the tube." On the other hand, it must be stated that an examination 



P:^ 



Anthura gracilis. Fig. 1. — ;S, dorsal view. Eddystone specimen, x 17. 



of several hundred tubes of Sabellaria spinidosa dredged in Plymouth 

 Sound did not yield a single Anthura. The female specimens collected by 

 the Laboratory have been generally found after the dredgings have been 



