524 



This feems to differ from the lafl in being deftitute of 

 ftriae, and in the mouth not being lengthened, but ter- 

 minating in a fmall round aperture; and is rather lefs. 



11. 



LiEVE. 



Serpula (Lagena) lasvis ovalls. Walk. Mitt. Shell, f. 9. 



Thefmooth oval Flaflc Wormfhell: the colour bluifh- 

 white, very tranfparent like glafs. From Sandwich. 

 very rare. 



This differs from the laft in being more oblong, and in 

 having a produced, cylindric mouth, like ihejlriata. 



12. 



Marginatum. 



Serpula (Lagena) marglnata. /Valk. Min. Shells, f. 7. 



The bordered Flafk Wormfhell: the colour white, 

 tranfparent and gloffy. From Reculver, very rare. 



This is in Ihape like the globofum, rather lefs, a little 

 comprelfed, and diflinguifhed by an elevated ridge, or 

 margin, that furrounds the (hell longitudinally. 



We have found it in fand on the coafl of Devon: but 

 never with the mouth fo much protruded as Mr. Wal- 

 ker's figure reprefents. 



13. 

 Retortum. 



Serpula (Retorta.) Turt. Lin. iv. p. 609. 



Adams Microfc. 1. 14. f. 6. 



Serpuli 



