394 



ANNELIDES. 



Pleione, 

 the East 



Sav. (Amplihiomc, Blainv.), which, with the same tentacles, have ciest-like gills. These also are fiotn 



Indies, and attain a ;;ieat size. 



To these may be added Eiipfironiite, Sav., which has but one 

 tentacle to the head, together with arbuscular gills, very 

 much developed and complicated ; and to which the genus 

 Anisteiia, Sav., established on a mutilated individual, should 

 probably be appro.ximated ; and, lastly, 



Hipponoe, Audouin & Edwards, which, devoid of caruncle, 

 has only one cirrhus and packet of bristles to each foot. There 

 is one at Port Jackson, //. Gaudic/iaudii, Aud. & Ed. 



Eunice, Cuv. — 



Fi^. :o3.-Eupi,rosine laure.ua. j^ likewisc fumislied with tuft-like gills, but the trunk 



is formidably armed with three pairs of dift'erently-formed horny jaws; each of their feet has two 

 cirrhi and a bundle of bristles ; and there are five tentacles upon the head above the mouth and two 

 on the neck. Some species only exhibit two small eyes. M. Savigny's family of Emiices is constituted 

 by this division, and the particular genus is termed by him Leodice. 



A species, from one to four feet in length, inhabits the sea around the Antilles (E.gigantea, Cuv.), which is the 

 largest Annelide known. Some upon our coasts are much smaller. 



M. Savigny distinguishes by the name of Marphisia certain species, otherwise very similar, which have no 

 nuchal tentacles, and the upper cirrhus of which is very short, as Nereis sanguinea, Montagu. Ati allied species 

 {N. tubicola, MuUer), inhabits a horny tube. 



After these genera with complex branchiae, are placed those in which the organs adverted to are 



reduced to simple laminae, or even to slight tubercles, or which, lastly, are represented only by the 



cirrhi. Some of them resemble Eunice by the powerful armature of the trunk, and by their antennai 



of unequal number. Such are 



Lycidice, Sav., — 



Which, together with the jaws of Eunice, or even a greater number than in that genus, and often un- 

 equal on the two sides, have but three tentacles, and cirrhi to perform the oitice of branchiae. 



Aglaura, Sav. — 

 Have likewise numerous jaws, of an unequal number, seven, nine, &c. ; but no tentacles, or which are 

 entirely hidden ; and the gills are similarly reduced to cirrhi. 



Under this name I unite the Aglaura and QSnone of Savigny, and even certain species without tentacles, which 

 MM. Audouin and Edwards leave in Lycidice, as Ag.fulgida and (E. lucida. 



The Nereids, properly so called (Nereis, Cuv. ; Lycoris, Sav.). 



Tentacles of an even number, attached to the sides of the base of the head, two other biarticulated 

 ones a little more forward, and between these two simple ones ; only one pair of jaws within the 

 trunk; the gills formed of little laminae, traversed by a network of vessels; and at each of their feet 

 two tubercles, two bundles of bristles, and a cirrhus above and below. 



A great number of species inhabit our coasts. 



[The species here figured, N. prolifcra (Mul- 

 ler, Zool. Dan.), exhibits a singular peculiarity 

 in its mode of propagation, merely by sponta- 

 neous division, the hind part of the body being 

 gradually transformed into an additional animal, 

 the head and tentacular cirrhi being already de- 

 veloped. MuUer describes one mother, to which 

 three foetuses, of different ages, appeared in one 

 length. The mother had thirty segments, the 

 young one nearest to it had eleven, and the two 



{. ," , , , ri^^r '2,14.- Nereis prolifcTa. 



hmder, or older ones, seventeen segments each. J 



After these should rank various genera, equally distinguished by a slender body, and gills reduced to 

 simple laminae, or even to simple filaments or tubercles. Several, however, have no jaws nor tentacles. 



Phyllodoce, Sav. {Nereiphylla, Blainv.), — 

 In common with the Nereids proper, have tentacles of even number at the sides of the head, and four 

 or five small ones anteriorly. They have distinct eyes ; their large trunk is furnished with a circlet 

 of very short fleshy tubercles, does not contain jaws, and, what particularly distinguishes them, their 



