ARTICULATA. 99 
the genus Clymene, the body is long and cylindrical, the extremities abrupt, 
the segments few and dissimilar, the head distinct, the thoracic portion long, 
and the abdomen short. The thoracic feet have two branches. It forms a 
tube with small shells and sand. 
Orver 2. Dorsrpranouta. Here the organs of motion, and especially 
those of respiration, are arranged in linear series, either from end to end, or 
at the middle portion of the body. The head and eyes are usually distinct, 
and there are antenne, jaws, and an extensible rostrum. The families are 
arranged by Audouin and Milne Edwards as follows: 1, Aphroditide; 2, 
Amphinomide ; 3, Hunicide ; 4, Nereide ; 5. Ariciide ; 6. Peripatide ; 
7, Chetopteride ; 8, Arenicolide. 
Fam. 1. Aphromitide. Body generally depressed, and shorter and 
wider than in the other annelida. Back with two rows of large membrana- 
ceous scales or elytra (except in the genus Palmyra), beneath which are 
the branchiee, which are not well developed. Two pairs of jaws are generally 
present, and the elytra and superior cirri are alternately present and absent 
upon the segments to a certain extent. Aphrodite has thirteen pairs of 
elytra, three antennz. The jaws are cartilaginous or rudimentary. Several 
species rival the humming birds in the brilliancy and play of their colors. 
A. aculeata (pl. T7, fig. 15), of the European seas, attains a length of six 
inches, and the dorsal scales are hidden by a hairy covering. 
Fam. 2. Amphinomide. Segments similar, branchiz ramose, tufted, or 
plumose, well developed, dorsal, or at the base of the feet; head distinct, 
mouth unarmed, no acicul, feet with one or two branches. - 
Fan. 3. Hunicide. The rostrum has from seven to nine corneous jaws ; 
branchize wanting or well developed, in the form of pectinated filaments : 
feet aciculate. Hunice has two eyes, seven strong jaws, four upon the left 
and three upon the right side; five large tentacles above the mouth, and two 
smaller ones at the nape; branchiz pectinated upon one side of the support- 
ing branch. The body is long and sub-cylindrical, the segments sometimes 
numbering four hundred. This genus contains the largest species of annel- 
ida known, &. gigantea of the Antilles, which is four feet or more in length. 
Fam. 4. Nereide. In this family the jaws are either absent, or amounting 
to two or four; the rostrum extends considerably beyond the head ; antennz 
mostly well developed. Vevezs is a genus of worms found upon the coast, 
moving about freely, or hidden in the cavities of rocks, or in dead shells ; and 
sometimes sunk in the mud. Like many other annelida, it is used by fisher- 
men as bait. Some are of a considerable size, and the colors are often agree- 
able. Phyllodoce (pl. 77, fig. 11) belongs to this family. The place of Spo 
Jilicornis ( fig. 14), which has two very long antennee, is not ascertained. 
Fam. 5. Aricidw. Wead and rostrum distinct; antenna, eyes, and 
branchize wanting, or rudimentary ; jaws and tentacular cirri absent ; each 
foot with a single cirrus. 
Fam 6. Peripatide. This family contains the single genus Peripatus 
of Guilding, who observed it in the West Indies, and described it as a 
molluse. The body is somewhat limaciform, both ends obtuse, the annula- 
tions not very distinct, each side margined with a row of short, thick, 
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