34 POPULAR CONCHOLOGY. 



riaceous, thin towards one end, generally with 

 adhesions. — There are 8 recent species. 



The Amphitrite inhabits the coasts of Eu- 

 rope, Jamaica, &c. 



Family 4. — Serpulidce. * 



The branchicE in this family are separated or 

 covered by an operculum. The tube is solid 

 and calcareous. — The genera are 4. 



8. Spikorbis. — Tube testaceous, turned 

 spirally on a horizontal plane, the 

 lower part of which is attached to 

 marine substances; the opening 

 is round or angular. — 16 species, 

 recent and fossil. 



This little spiral tube is frequently seen on 

 the fuci found on the shore, and also on shells 

 or other marine bodies. It is often found in 

 great numbers, but each individual is isolated. 



9. Sekpula. — Tube 

 solid, calcareous, irregu- 

 larly twisted, fixed, the 

 aperture round and 

 smooth. — 60 species, re- 

 cent and fossil. 



* Les Serpulees, Lamarck. 



