378 



ARTICULATA : WORMS. 



SUB-SECTION III. 

 THE ORDER OF TUBICOLA OR SERPULAS, ETC. 



FIG. 511. 



worins O f ug g rou p are a s O con . 

 lined to the sea, and live in calcareous or 

 membranous tubes which they exude or 

 secrete from their own bodies. Their 

 branchial appendages are situated 

 around the head, in a flower-like cluster, 

 surpass- 

 i u g 1 y 

 beauti- 

 ful both 

 instruc- 



N 





FIG. 512. 



Marine Worm. Serpnla. 



color. Their tubes are 

 common on shells, stones, 

 and other bodies in the 

 sea, and are generally 

 more or less bent, curved 

 or contorted ; and always 

 closed at the small end 

 and open at the other. 

 These tubes are frequent- 

 1 y found penetrating 

 corals and other marine 

 bodies. The Serpulidae 

 are prominent represen- 

 tatives of this order. 



The Terebellidfe form 

 their tubes by a glutinous secretion and by pieces of shell 

 and grains of sand which are held together by this secre- 

 tion. Terebella, Amphitrite, etc., belong here. 



Amphitrite ornata, Verrill. 





