154 SEDENTARI.E. 



form, oval, with four contiguous, convex volutions, the last of 

 which being the largest, and prolonged into a straight waved 

 tube, which is convex above, carinated beneath, and subdepress- 

 ed, and plicated on the sides ; the plicai are lamellar, close 

 waved, vertical, and thicker on the one side than on the other. 



This shell is usually found imbedded in a species of Madrepore. The ani- 

 mal is unknown. Lamarck supposes that it must, in the first place, occupy 

 tJie spiral volutions, from which it removes totally, as necessity requires an 

 extension of the tube ; and that when it quits one part, it must till it up 

 with calcareous matter. 



Magilus antiquus. — The Antiquated ]\Iagilus. Plate 

 XIX. fig. 17. Tubular, distorted, transversely wrinkled ; of a 

 pale yellowish-brown. Inhabits the sea at the Isle of France. 



Genus 2. — GALEOL ARIA.— Za/HarcA. 



Generic Character. — Body tubular, provided anteriorly with 

 a testaceous operculum ; tubes testaceous, very numerous, cy- 

 lindrical, subangular, erect, waved, crowded, adhering by their 

 base and open at the summit ; aperture orbicular, terminating on 

 the side by a spatulous tongue, with an orbicular operculum, 

 consisting of from five to nine testaceous pieces above, and all 

 attached to one side. 



Galeolaria recumhens. — The Recumbent (jaleolaria. 

 Plate XIX. fig. 16. White, and existing in reclining congre- 

 gated masses. 



Genus 3.— VERMJLl A.— LamarcL 



Genenc Character. — Body tubicular, elongated, and attenu- 

 ated towards the posterior part, and provided towards the up- 

 per part with a simple, testaceous, orbicular operculum ; tube 

 testaceous, cylindrical, posteriorly narrowed, more or less twist- 

 ed, and adhering by the side to marine substances ; aperture 

 round, and the margin frequently provided with from one to 

 three denticles. 

 Shells attached by one side to marine bodies. 

 Vermilia triquetra. — The Triangular Vermilia. Plate 

 XIX. fig. 18. White or reddish, rugged, variously twisted, 

 and triangular ; carinated along the back. Inhabits the coasts 

 of Britain. 



