UNIVALVES. — SERPULA. 145 



spiral convolutions of its shell. The S. miiricata has its 

 shell beset with a succession of spines or prickles : it is 

 usually of a rosy or pink colour, and sometimes has its aper- 

 ture margined. 



The S. cornu-copige, or horn of plenty, is, in all proba- 

 bility, only a dropped Helix nemoralis, or common garden 

 snail, and of course not belonging to this genus. The S. 

 denticulata is sometimes found in the Lepas tintinnabu- 

 lum; and the S. granulata adheres to the roots of the fucus 

 digitatus ; the S. retorta is retort shaped; the latter is scarce. 

 The S. incurvata partially resembles the Nautilus semili- 

 tims, but it wants the internal concamerated structure. 



The colours of the Serpulse are various; the most gene- 

 ral, however, are brown, purple, yellow, tawny, pink, and 

 white, sometimes a little greenish. 



The Indian, African, American, and Northern oceans 

 supply many species; as also do the European, Mediter- 

 ranean, Adriatic, and Red seas. 



SER-PVLA— Worm-Shell. 



Division I. — Attached to other substances. 

 Spirillum — Minute Spiral. Glomerata — Glomerated. 



Tx\c\Vieira— Three- sided. Comca—Co7iical. 



*Intricata — Intricate. *Vermicularis — Round. 



*Corrugata — Wrinkled. *Tubularia — Tubular. 



Contortuplicata — Twisted. Denticulata — Toothed. 



Goreensis — Goree. Ocrea — Boot-shaped. 



Gigantea — Great. 



Minute Shells. 

 Stellaris — Rayed pin's-head. Granulata — Grained. 



Planorbis — Flat. Cancellata — Grooved. 



Minuta — Minute. *Heterostropha — Reversed. 



Spirorbis— Tapering. *Lucida.— Shining. 



CsLTimta—Keeled. \itresi--Glossy. 



