8 THE ELEMENTS 



4th. AMPHITRITE. 



Body projecting from a tube and 

 annulate ; peduncles, or feet, small , 

 numerous ; feelers two, approximate, 

 feathered ; no eyes. 



5th. TEREBELLA. 

 Body oblong, creeping, naked, 

 often inclosed in a tube, furnished 

 with lateral fascicles, or tufts, and 

 branchiae ; mouth placed before, fur- 

 nished with lips without teeth, and 

 protuding a elevate proboscis ; feelers 

 numerous, ciliate, capellary, seated 

 round the mouth. 



6th. NEREIS. 

 Body long, creeping, with nume> 

 rous lateral /?ec?«mc/(e*, ovfeet, on each 

 side ; feelers simple, rarely wanting 

 none ; eyes two or four, rarely none. 



7th. ASCIDIA. 

 Body fixed, roundish, and appa- 

 rently issuing from a sheath; aper- 



