THE MARINE WORMS 



159 



growths, called parapodia by the naturalist, because although 

 leg-like they are not jointed like the true legs of the crabs and 

 their allies. In the leaf- worms these parapodia bear expansions, 

 shaped like leaves, by means of which the animals swim. The 



F IG . 78. The paddle-worm (Phyllodoce lamelligera). Note the leafy plates 

 at the sides of the body. 



leaf-like effect is increased by the fact that the plates are some- 

 times green, as in Eulalia viridis, common in rock crevices, which 

 reaches a length of about 3 inches. The larger paddle-worm 

 (Phyllodoce lamelligera), which 

 is sometimes 2 feet long, is 

 of a darker green with an 

 iridescent shimmer. A much 

 smaller form (P. macualata), 

 which lives in sandy places, > 

 is on the other hand deli- 

 cately marked with brown. 

 It is 3 or 4 inches long, but 

 is very slender in proportion 

 to its length. 



Of the tube - inhabiting 

 forms we may mention first 

 the sand-mason (Terebella con- 

 chilega), a type of those who 

 build long tubes of particles 

 of sand, stone and shell, the 

 mouth being fringed with 

 sandy threads. These tubes 

 are often very abundant after 



I storms, and among the rocks one may find them in situ, sticking 

 up through the sand. Those on the shore are always empty, 



c^ 



FlG. 79. The sand-mason ( Terebella conchilega), 

 removed from its tube. Note gills, tentacles, 

 and hooks. 



