ARTICULATA. 639 



Liimarck divides this class into three orders. 



OKDEIl I. SEDENTARI^, 



Wliich coutains the following genera :— 1 MagiUis ; 2. Galeolaria ; 3. Ver- 

 milia; 4 Serpula; 5. Spirorbis; 6. Aniphitrite; 7. Terebella; 8. Sabellaria; 

 9. Pectinaria; 10. Dentalium ; 11. Clymene ; 12. Siliquaria; 13. Arenicola. 

 — Of which we have figured the following, 



Mitgilus antiquus.—The Antiquated Magilus. Plate Ixxxi. fig. 17. Tu. 

 bular, distorted, transversely wrinkled ; of a pale yellowish-brown. lu- 

 liabits the sea at the Isle of France. 



Galeolaria recu/nbens.— The Recumbent Galeolaria, Plate Ixxxi. fig. 16. 

 White, and existing in reclining congregated masses. 



Vermilia tiiguetra.— The Triangular Vermilia. Plate Ixxxi. fig. 18. 

 White or reddish, rugged, variously twisted, and triangular; carinated 

 along the back. Inhabits the coasts of Britain. 



Serpula vermicularis.—Thc Vermicular Serpula. Plate Ixxxi. fig. 14. 

 White, cylindrical, tapering, rugged, variously curved and twisted. In. 

 habits the coasts of Britain. 



Spirorbis Nautioides.— The Nautilus. Shaped Spirorbis. Plate Ixxxi. fig. 15. 

 White, nautilus-shaped, transversely wrinkled. One-eighth of an inch in 

 diameter. Inhabits the British coasts, on Algae, &c. 



Aniphitrite ventilabrum.— The Fan Amphitrite. Plate Ixxxi. fig. 19. 

 Tube tapering, incurved, and smooth ; of a cream-yellow colour. Inhabits 

 the Mediterranean sea. 



Terebella concJiilega.—The Shelly Terebella. Plate Ixxxi. fig. 21. Tube 

 covered with numerous fragments of broken shells agglutinated together j 

 with three branchise on each side. Inhabits the coasts of Holland. 



Sabellaria crassissima.— The Thickest Sabellaria. Plate Ixxxi. fig. 22. 

 Tubes long, thick, somewhat parallel, and contiguous ; the openings nearly 

 obsolete. 



Pectinaria Selgica.— The Belgic Pectinaria. Plate Ixxxi. fig. 23. Tube 

 inversely conical, membranaceous and covered with particles of sand. In- 

 habits the European seas. 



Dentalium entalis.— The Tooth DentaUum. Plate Ixxxi. fig. 26. White 

 or yellowish, slightly curved, smooth and tapering to a fine point. One and 

 a half inch long. Inhabits the British seas. 



Dentalium elephantinum.— The Elephantine Dentalium. Plate Ixxxi. fig. 

 27. Green, slightly bent, with ten longitudinal ribs. Three to four inches 

 long. Inhflbita the Indian and European seas. 



Brochus trachiformis.— The Trsechiforra Brochus. Plate Ixxxi. fig. 25. 

 Brown, regularly furrowed transversely. Fourth of an inch long. Inhabits 

 the British seas. 



Siliquaria Anguina.— The Snake-like Siliquaria. Plate Ixxxi. fig. 24. 

 Shell taper, undulating, with a longitudinal fissure ; spiral at the extremity. 

 Inhabits the IncUan seas. 



ORDER II. — ANTENNATiE. 

 The head is antenniform, and provided with eyes ; and having a projec- 

 tile proboscis frequenUy furnished with jaws ; and setaceous papillae, which 

 arc pediform and retractile i the branchise are longitudinally disposed. 'Iha 



