DORSIBRANCHIAT^. 437 



sisting of seven, nine, 8cc.; but their tentacula are either wanting or 

 completely concealed^ their branchiae are also reduced to cirri(l). 



Nereis, Cuv. Lycoris, Sav. 



The true Nereides have an even number of tentacula, attached to 

 the sides of the base of the head, and a little further forwards two 

 others that are biarticulate, between which are two simple ones. 

 Their branchiae consist of small laminae between which is spread a 

 network of vessels^ each loot is also furnished with two tubercles, 

 two fasciculi of seta:;, one cirrus above, and another beneath. 

 Several species inhabit the coast of France(2). 



In the vicinity of these Nereides are grouped several genera 

 in which the body is also slender, and the branchiss are re- 

 duced to simple laminsB, or even simple filaments or tubercles. 

 The jaws or tentacula are wanting in some of them. 



Phyrlodoce, Sav. Nereiphylla, Blainv. 



Tlie Phyllodoces, like the true Nereides, have an even number of 

 tentacula on the sides of the head, and four or five small additional 

 ones before. They are furnished with eyes; their large proboscis, 

 which is studded with a circle of very short fleshy tubercles, pre- 

 sents no jaws, and, what particularly distinguishes them, their bran- 

 chiae resemble broad leaves, arranged in a single row on each side 

 of the body, and overlapping each otherj finely ramified vessels are 

 distributed over them(3). 



(1) I unite the Aglauh^ and CEnones, Sav., and even certain species without 

 tentacula, left among- the Lysidices by Messrs Audouin and Edwards; Aglaura 

 fulgida, Eg. Annel., V, 2; (Enone liicida, lb., f. 3. 



(2) Nereis versicolor, Gm., Mull., Wurm., VI; N.Jimbriafa, Id., viii, 1 3; N. 

 pelagica, Id., vii, 1 3; Terebella rubra, Gm., Bomme, Mem. de Fless., VI, S57, 

 f. 4, A, B; Lycoris segyptia. Eg-., Annel., -pi. iv, f. 1; Lycoris nuntia, Id. lb. f. 

 2; Nereis beaucoudrasii, Aud., and Edvv., LlttoK de la Fr., Annel., pi. iv, f. 

 1 7; Ner. pulsatoria, lb., f. 8 13. 



N.B. The Nereis verrucosa. Mull., Ver., pi. vii, ar.d incisa, Ott., Fabr., See. 

 Hist. Kat. Copenhag., V, part I, pi. iv, f. 13, seem to have the head of a Ly- 

 coris, but with long filaments in place of branchiae; they require examination. 



(3) Nereis lamelUfera atlantica. Pall., Nov. Act. Petrop., II, pi. v, f. 11 18, per- 

 haps the same as the Nereiphylle de Pareio, Blainv., Diet, des Sc. Nat.; N. flava, 

 Ott., Fabr., Soc. Hist. Nat. Copenhag., V, part I, pi. iv, f. 8 10. 



N.B. The N. viridis, Mull., Ver., pi. xi, of which, without having seen it, M. 



Savigny proposes to make t!r genus Eulalia, and the two Euxomi.b, Risso, Eu- 



rop. Merid., IV, p. 420, also appear to me to be Phyllodoces; perhaps we should 



also so consider the Nereis pinnigera, Montag., Lin. Trans., IX, vi, 3; and the 



Vol. II. 3 H 



