484 
ANNELIDES. 
the orifice of the proboscis; jaws horny ; five antennae, the odd 
one sometimes wanting; four eyes; and provided with dorsal 
scales. 
Genus 1G.—HALITHEA.— Lamarck. 
Generic Character. —Tentacula divided and somewhat ra¬ 
mose, tufted, apd surmounting the orifice of the proboscis; jaws 
cartilaginous, and hardly visible; odd antennae subulate, small, 
the middle ones obsolete, the exterior largest; two eyes ; and 
back with scales. 
Halithea aculeata. — The Spined Halithea. 
Plate XCIII. fig-. 2. 
Oblong, with shining spines and hairs; dorsal scales dotted 
with brown. Inhabits the British coasts. 
Genus 17.—PALMY R A.— Lamarck. 
Generic Character. —Proboscis without tentacula at its orifice ; 
jaws semicartilaginous; exterior antennae larger than the three 
others ; two eyes, but no dorsal scales. 
ORDER III_APODES. 
Without feet; branchiae, when they exist, disposed interiorly 
along the body. It consists of ten Genera. 
TRIBE I.-ECHIUREjE. 
Body with projecting bristles, but not retractile. 
Germs L —CIRRATULUS Lamarck. 
Generic Character .—Body elongated, annulated; each side of 
the back with a row of very long setaceous cirri, nearly dorsal, 
and two rows of short spines placed below; two fasciculi of 
long projecting cirri inserted under the anterior segment; mouth 
below the anterior extremity, with a rounded operculum ; the 
eyes at the extremities of a crescent-formed line. 
Genus 2.—THAL A SSEMA. — Lamarck. 
Generic Character .—Body soft, elongated, subcylindrical, 
