SEA-WOEMS. 187 



up behind the animal. In this respect our AmpJdtrite iq- 

 sembles some species of Mollusca, which fill up the cavities 

 of their shells behind them, stilly as the shell grows, keep- 

 ing their bodies near the open end of the cavity. The body 

 consists of a hundred and forty rings of a reddish-brown 

 colour, with paler belts between. Each ring has a con- 

 tractile tuft of bristles on each side, serving as feet. The 

 flower-funnel consists of two fasciculi of long filaments 

 webbed together; each filament furnished with a finer set 

 of filaments on their inner^ edges. Currents of water are 

 seen continually flowing up and down this funnel very ra- 

 pidly, caused by cilia on the secondary filaments. Our soli- 

 tary specimen is very pale compared with the ^geans, which 

 have more of a purple tint ; its circle of gills make a very 

 pretty flower nevertheless. I follow the Trench author in 

 applying the name as above, but only do so provisionally, 

 agreeing with the late lamented Professor Forbes as to the 

 probable necessity for giving it another generic appellation. 



Sabella tubularia: 



Our London collections contain living specimens of this 

 magnificent Worm, which forms a stiff leathery tube, almost 

 like the shell of a Serpida in appearance, but not so in 



