SEA-MAT MAKERS. 



313 



a metallic lustre, and almost look as if they were 

 wrought in silver and richly chased." It is one of 

 the most abundant of British Polyzoa. 



Other encrusting 

 species, belonging to 

 different genera, will 

 be found forming 

 greyish, or whitish, 

 patches on stones, 

 rocks, shells, &c., but 

 the description or 

 enumeration of these 

 belongs not to our 

 province. We have 

 indicated a wide 

 field for investiga- 

 tion, and given an 



introduction tO tWO FIG> 6 3 .-MEMBRANIPORA. 



hundred and thirty- 

 five minute British animals that construct their 

 homes in the sea, and all differing in some respect 

 from each other in the form or decoration of the 

 houses that they inhabit. 



