( 38 ) 



6 Spirorbis, Lam. M. 



Tube turned in an or- 

 bicular spire, discoid, flat- 

 tened, and adherent un- 

 derneath. (1) Fig. 123, 



7. Galeolaria." Lam. M. 



Tubes numerous, cylin- 

 drical, sub-angular, un- 

 dulated, collected in tufts, 

 fixed at base; opening 

 superior, orbicular. (2) 

 Fig. 133. 



8. Maoilus, Montf. M. 



Tube convex above, ca- 

 rinated underneath , twist- 

 ed in a short oval, with a 

 heliciform spire, four turns 

 contiguous, the last pro- 

 longed in a straightly un- 

 dulating line ; scaly folds 

 on the outside, thicker on 

 one side than the other. 

 (3) Fig. 128. 



9. Sabella. Cuv. M. 



Tube composed of fine 

 grains of clay and sand. 

 Fig. 127. 



40. Nereis. Cuv . M. 



Tube long, horny or 

 membranous. (4) Fig. 137. 



Operculum orbicular 

 galeiform, armed witfc 

 from 5 to 9 various tes- 

 taceous pieces, the mid 

 die one of which is trim 

 cated, and all attachec 

 to the edge of one side 



(1) Foss. at Grignon. 



(2) New-Holland. 



(3) The tube is sometimes 3 feet in length. Lamarck supposes the Serpula 

 glgantea of Pallas, to be a species of this genus. Isle of France. 



(4) Several of the smaller species contribute to the luminous appearance of 

 the sea. 



