Homes or Tubes fanned hi/ Annelids. 7 



parts, wliile at its base is an opaque mass of granules. 'I'lie 

 latter is much enlarged at the point of attaelnnent to the 

 tube, and is there coated by the sandy mud forming the 

 general investment. Few structures formed by invertebrate 



Fi{r. 1. 



Fiir. 2. 



Fig. i. — 'Inhe of Xor/Iiia conchi/leffa, from Shetland. About twice the 



natural size. 

 Fig. 2. — End of tube of Terehella {Lanice) eonchilega. Some of the 



fringes are broken. Slightly enlarged. 



animals show greater skill or better-directed ingenuity than 

 this wonderful tube and its complex spines. The precise 

 natiire of its enemies is unknown, but few predatory fishes 

 would care to interfere with prey thus armed. 



No form is more abundant or has more frequently come 

 under the notice of those who are familiar with sandy shores 

 than the next example, viz. Terehella (^Lanice) concliilega^ 



