478 
ANNELIDES. 
Sabellaria crassissima. — The Thickest Saeellaeia. 
Plate XCII. fig. 22. 
Tubes long, thick, somewhat parallel, and contiguous ; the 
openings nearly obsolete. 
Genus 9.—PECTINARIA.— Lamarck. 
Generic Character —Body tubular, subcylindrical, attenua¬ 
ted behind, with a row of setaceous papillse on either side; 
bristles short, fasciculated; broad, blunt and oblique in front, 
with golden yellow very brilliant transverse spangles ; mouth 
elongated, with two lips, surrounded, with numerous short ten- 
tacula ; four pectinated exterior branchiae, placed on the second 
and third segments of the body. Tube the shape of a reversed 
cone, membranaceous or papyraceous ; consisting of sandy par¬ 
ticles, and not adherent. 
Pectinaria Belgica. — The Belgic Pectinarja. 
Plate XCII. fig. 23. 
Tube inversely conical, membranaceous and covered with 
particles of sand. Inhabits the European seas. 
TRIBE III.-MALDANIiE. 
With intermediate branchiae; tube open at both ends. 
Genus 10.—DENTALIUM.— Linnaeus. 
Generic Character. —Body tubular, conical, with the an¬ 
terior extremity exsertile and surrounded by a membranous ring ; 
mouth terminal and naked. Tube testaceous, nearly regular, 
slightly bent, attenuated towards the posterior extremity, and 
open at both ends. 
* Tubes having longitudinal ribs or striae. 
Dentalium elepliantinum .— The Elephantine Dentalium. 
Plate XCII. fig. 27. 
Green, slightly bent, with ten longitudinal ribs. Three or 
four inches long. Inhabits the Indian and European seas. 
** Tubes smooth. 
