92 



ANNELIDA. 



Sdbellaria (Lamk.). Bristles forming many con- 

 centric crowns, forming an operculum of two pieces. 

 Tubes irregular, adherent to other bodies, often 

 much crowded. 



S. alveolata. Fig. 143 ; n. s. 

 crassissiroa. 



143 



144 



146 



145 



Sipltonostoma (Otto). Bristles very numerous, 

 forming a concave fan on each side of the head ; 

 gills consisting of tufts of soft threads placed 

 within the concavity of the fans, and on each side 

 of the mouth ; two short fleshy tentacles : no proper 

 tube. 



S. vestitum (Gosse MS.) Fig. 144 ; n. s. 

 uncinatuin. 

 gelatinosum. 



Flemingia ( Johnst.) . Bristles eight in number, 

 green, retractile ; two thread-like tentacles ; bod y 

 hairy, with sixty pairs of feet, bearing bristles which 

 are not retractile. (A singular worm, of doubtful 

 position.) 



F. plumosa. Fig. 145 ; n. s. 



