14 



sesile, opaque, dirty white or tinged with red, irregularly 

 twisted and contorted, sometimes nearly straight or but 

 slightly flexuous, roughened with transverse wrinkles 

 usually more or less carinated and often with a smaller 

 ridge on each side of the dorsal one : operculnm cor- 

 neous and striated. On old shells, fyc. not uncommon. 



VERMILIA. 



Testaceous, cijlindraceous, laterally affixed, insensibly 

 attenuated towards the posterior end, more or less 

 twisted ; aperture orbicular, usually armed with 

 from one to three teeth. 



V. TRiQUETRA,Zaw. 2. SERPULA. T.Lin. 1265. 

 (not Born) Mont. Sup. p. \57.-Turt. D. p. 152. 

 Sow.G.D.p. [Q7S.Sow. Brit.Mise.t.3}. (good) 

 Flexuous, fixed throughout its entire length, clear 

 white, (rarely pink) the base more or less flattened 

 and spreading, and the dorsal portion with a very dis- 

 tinct sharp simple keel, thus rendered triangular, 

 smooth. 2. 0,167. Extremely common on Oyster 

 Shells, tyc. 



V. SCABRA. Lam. 7. Affixed, serpentine, slender, 

 about five minute denticulated dorsal keels. Cornwall. 



CLASS CIRRHIPEDA. 

 Shell either sesibJe or tfawtted on a flexible tendinous- 



