ARRANGEMENT OF THE ANNELIDES. 25 



form two tribes, each consisting of a single genus, Pe- 

 repafes and Campontia. Those which have their feet 

 furnished with cirrhi, are the Nereids, which are very- 

 abundant upon our coasts. They have a slender elon- 

 gate body, their legs are furnished with tubercles, and 

 the proboscis is armed with two very strong mandibles. 

 They comprise many genera; viz. Glrjcera, Nephtys, 

 Alciope, Nereis, Syllis, Phyllis, Hesione, &c. The Eu- 

 NiciDJE resemble the latter in their general form ; but 

 their feet are furnished with long filaments springing 

 from one stem, like the teeth of a comb. They com- 

 prise the genera CEnone and Aglaura, which have eight 

 mandibles, and conceal the head beneath the first segment 

 of the body : Lycidice and Leodice have seven man- 

 dibles, with the head free and porrect; and further, Dio- 

 patra, Eunice, &c. The AiwPHYNOMiDiE are those whose 

 branchiffi are very complicated, — being tufted or ramose, 

 — and they are spread all over the body. They have no 

 maxiUae. The genera they consist of are Hiponoe, 

 Euphrosyne, Amphynoma, Chloe'ia. And, lastly, the 

 ApHRODiTiDiE, which are the most conspicuous of all : 

 their body is oval, and fringed with long setse glittering 

 with the most brilliant metallic splendour ; their back is 

 furnished with large membranous plates like elytra, dis- 

 posed alternately, and hidden beneath an arch of fur 

 formed by a dense multitude of hairs, which spring, like 

 the before-mentioned setse, from the feet of the animal, 

 and are placed alternately as far as the twenty-fifth 

 pair. They comprise Sigalion, Palmyra, Aphrodita, &c. 

 Polynoe closely approaches the Aphroditce in their struc- 

 ture, but the latter are destitute of setse, ^(18 — 23.) 

 W.E. Sh.] 



(24.) Mr. MacLeay's is the last arrangement of the 

 Annelides we shall notice : his definition of the whole 

 class and of the chief groups will here be given in 

 nearly his own words. These animals, he observes, 

 differ from true (or rather typical) Annxilosa, in being 

 hermaphrodite, and in general red-blooded. They are 

 soft, vermiform animals, of an articulated structure. 



