194 UNIVALVES SERPULA. 



acute tip, and very much resembles a cork-screw. One 

 of the most remarkable species is the S. anguina, 

 which has a slit or jointed cleft along the spiral convo- 

 lutions of the shell. The S. muricata has also a lon- 

 gitudinal fissure, and is armed with short spines or 

 prickles ; it is usually of a rosy or pink color, and 

 sometimes has its aperture margined. 



The well known but rare species the S. aquaria, forms 

 the third division. The larger end of this shell is clos- 

 ed by a convex disk, with numerous small perforations, 

 and generally a longitudinal one in the middle; the 

 whole encircled by a dilated margin of elegant pa- 

 pyraceous tubes, resembling a beautifully plaited ruff or 

 frill ; the smaller end is open. 



The Indian, African, American, and Northern oceans, 

 supply many species ; as also the European, Mediter- 

 ranean, Adriatic, and Red seas. 



Serpula is derived from Serpo, to creeps in reference 

 to the vermiform character of some of the species. 



Divisiox I. — Attached to other substances. 



Scientific Name. Locality. Common Name. 



Spirilluiii Europe Minute-spira! S. 



Triquetra Ditto, America Three-sided do 



Intricata Mediterranean, Britain • • Intricate • • do 



Corrugata Devonshire Wrinkled • do 



ContortupHcata • Europe, Mediterranean • • Twisted • • do 



Goreensis Goree Goree • • • • do 



Glomerata European Seas Glomerated do 



Conica America, Amboyua •••• Conical-" do 



Vermicularis Britain Round do 



Tubularia Devonshire Tubular . • • do 



