SEDENTARIA. 177 



tacula ; tube elongated, cylindrical, attenuated, and pointed 

 at the base, membranous, consisting of agglutinated grains 

 of sand and fragments of shells. 



Terebella conchilega. — The Shelly Terebella. Plate 

 XIX. fig. 21. Tube covered with numerous fragments of 

 broken shells agglutinated together; with three branchiae 

 on each side. Inhabits the coasts of Holland and Britain. 



It is not a shell, properly so called, however, any more than the tube 

 of the caddis worm. 



** With short branchiae ; tentacula short or awanting. 

 Genus 8 — SABELLARIA. —Zamarc^. 



Generic Character. — Body tubicolar, subcylindrical, atten- 

 uated behind ; with fasciculi of subulate bristles in a single 

 row on each side, and spathulous bristles and transverse 

 laminae, bordered with hooked setse ; anterior extremity 

 obliquely truncated, elliptical, surmounted by six rows of 

 brilliant spangles, three rows on either side; mouth elongat- 

 ed, cleft, with two lips, situated under the internal spangles; 

 branchiae small, placed near the mouth ; tubes numerous, 

 congregated in a common mass, composed of grains of sand 

 and fragments of shells, and having cup-shaped orifices. 



Sabellaria crassissima. — The Thickest Sabellaria. 

 Plate XIX. fig. 22. Tubes long, thick, somewhat parallel, 

 and contiguous ; the openings nearly obsolete. Inhabits the 

 coasts of France and England. 



Genus 9.— PECTIN ARIA Lamarck. 



Generic Character Body tubicolar, subcylindrical, at- 



tenuated behind, with a row of setiferous papillae on either 

 side ; bristles short, fasciculated ; broad, blunt, and oblique 

 in front, with golden yellow very brilliant pectiniform plates ; 

 mouth elongated, with two lips, surrounded with numerous 

 short tentacula; four pectinated exterior branchiae, placed 

 on the second and third segments of the body. Tube the 



