12 



whorls, sometimes the whorls turn upon each other, \vidi 

 the aperture projecting upwards and not unfrequeritly 

 the spires are unconnected. On Pertularice (especially 

 Abrietina) W. and E. Coast. 



S. CORNEA. SERPULA C. Lin. Tr. 5. t. I./. 33, 



4, 5, Regular, rounded, pellucid, brownish horn co- 

 lored, with three whorls. A doubtful species. 



S. REVERSA. SERPULA R. Mont. p. 308. Turt. 

 D. p. Subcylindrical reversed, rugose, white, much 

 wrinkled transversely, more or less spiral and tapering, 

 sometimes with three or four volutions pretty regularly 

 placed laterally, (sometimes the smaller end is projecting 

 and the larger end coiled, either laterally or upon each 

 other and open in the middle.) Diam. i. Devonshire, 

 on Pecten Opercularis. 



GENUS SERPULA. 



Tube solid, calcareous, irregularly twisted, grouped or 

 solitary, sessile ; aperture terminal, rounded, very 

 le. 



S. MULLERI. Berkely in Mag. Nat. 7. S. VERMI- 

 CULARIS, Midler, Zool. Dan. 3. p. 9. t. 86. /. 7. to 9. 

 Cylmdric, white, gradually tapering, generally termina- 

 ting in a fine point and wrinkled transversely, attached 

 throughout the whole surface : a double infundibuliform 

 operculum. Common. 



