525 



Serpula (Retortd) rotunda marglnata cervice curvat'un exerto. 

 JValk. Min. Shelh. f. 10. 



The marginated Retort Wormniell ; the colour white 

 and opaque. From Sandwich not common. 



This fpecies differs from the lafl; in having a produced, 

 fub-cylindric, recurved mouth ; the body is more orbi- 

 cular, and the margin that furrounds the fliell more 

 flrongly defined. The fpecimen we received from Mr. 

 Boys is a little compreffed, and has a fmall depreffion, 

 ox fub -umbilicus, on each fide near the centre. Diame- 

 ter not half a line. 



14. 

 V. with a bottle-fhaped, fmooth fhell, furniflied with Perlucidum. 

 fix, equidiftant, longitudinal ribs, and a fmall knob at Tab. 14. f. 3. 

 the bafe ; neck very long, fub-cylindric : aperture ex- 

 tremely fmall : colour white, tranfparent, and glofly. 



Length not one tenth of an inch. Found at Seaf alter. 



15. 

 V. with an Urn-fhaped, fmooth, gloflTy, femi-tranfpa- UrnjE. 

 rent white fhell; at the bafe a (lender appendage, or Tab. 14. f. 1. 

 knob : aperture produced by a conic neck. 



Length fcarce one line. Found in fand from Shepey 

 ifland. 



V. with 



