174 SEDENTARIA. 



TRIBE I. SERPULACEA. 



The branchiae are either separate, or covered by an oper- 

 culum ; tube solid and testaceous. 



Genus 1. — MAGILUS — Lamarck. 



Generic Character. — Shell with its base bent into a spiral 

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

 of which is the largest, and prolonged into a straight waved 

 tube, which is convex above, carinated beneath, subdepressed 

 and plicated on the sides ; the plicae lamellar, close, waved, 

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



This shell is usually found imbedded in a species of Madi'epore. The 

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

 occupy the spiral volutions, from M'hich it removes totally, as necessity 

 requires an extension of the tube ; and that when it quits one part, it 

 must fill it up with calcareous matter. 



Magilus antiquus — The Antiquated Magilus. 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.— Lamarck. 



Generic Character. — Body tubicolar, provided anteriorly 

 with a testaceous operculum ; tubes testaceous, very nu- 

 merous, cylindrical, subangular, erect, waved, crowded, ad- 

 hering by their base and open at the summit ; aperture or- 

 bicular, terminating on the side by a spathulate process, with 

 an orbicular operculum, having from five to nine testaceous 

 pieces above, and all attached to one side. 



Galeolaria recumbens. — The Recumbent Galeolaria. 

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

 gregated masses. 



Genus 3.— VERMILIA Lamarck. 



Generic Character. — Body tubicolar, elongated, and atten- 



