T2 
whorls, sometimes the whorls turn upon each other, witli 
the aperture projecting upwards and not unfrequently 
the spires are unconnected. On Pertularie (especially 
Abrietina) W. and E. Coast. 
S. Cornea—Serpura C. Lin. Tr. 5. t. 1. f. 33, 
4,5,—Regular, rounded, pellucid, brownish horn co- 
lored, with three whorls. 4 doubtful species. 
S. Reversa.—SeErputa 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 endis projecting 
and the larger end coiled, either laterally or upon each 
other and open in the middle.) Diam. 2. Devonshire, 
on Pecten Opercularis. 
Genus SERPULA. 
Tube solid, calcareous, irregularly twisted, grouped or 
solitary, sessile ; aperture terminal, rounded, very 
simple. 
S. Muuxert. Berkely in Mag. Nat. 7.—S. Vermt- 
cuLARIS, Muller, Zool. Dan.3. p. 9.t. 86. f. 7. to 9. 
Cylindric, white, gradually tapering, generally termina- 
ting ina fine point and wrinkled transversely, attached 
throughout the whole surface: a double infundibuliform 
operculum. Common, 
