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 Madrepore. The 

 animal is unkno^vn. Lamarck supposes that it must, in the first place 

 occupy the spiral volutions, from which 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 antiquns — 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.— Zawarc^. 



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- 



