DOR^.IBUAXCllIATA. 303 



gills are in the form of very broad leaves, forming a range on cacli side of the hody, upon which minute 

 vessels ramify extensively. 



Tho iV. viridis, ftliilk-r, of which M. Savigny, without having seen it, proposes to make a ^enus Euialia, and the 

 twu species Of i!;H//om/«, Kisso, apiioar tome to l)t;hjiiijto P/z/y/Zot/oce, to which also, perhaps, sliould be referred tlie 

 Nfrdspinnigeni, Montiip^u, ami the N. slillifern, Muller, which M. Snvit^ny, without seen them, proposes to make 

 intu a <,^eniis Lcpidlay and .v. himjn, (.)ttu, which M. Savipny i)laces with N.flava in his genus Efiova. All these 

 require tube examined anew after the met)iud detailed byM. Savi^niy. Tbeffenus Phylludoce, Sav., liuwever, must 

 nut be confounded with tliat of M. Kanzani, which latter is allied to Aphrodila, and especially to Poljiioe. 



Alciope, Aud. & M. Edwards, — 

 Have nearly tho mouth ami tentacles of riiyllo{lo(;e, hut the feet present, besides the tubercle which 

 hears the lu'istlcs and the two foUated cirrlii, ur gills, a couple of branchial tubercles, which occupy its 

 ujiper aud lo\\ci' borders. 



Spio, Fabricius & Gmclin. 

 A slender hody ; two very long tentacles that have the appearance of antennfE ; eyes upon the head, 

 and on either side of each segment of the body a gill in form of a simple filament. They are small 

 northern Sea-worms, which inhabit membranous tubes. 

 Pobjdore, Bosc, appears to me to be referrible to this ;j;enus. 



SvLMs, Sav. — 

 Have tentacles of uneven numbers, articulated in chaplets, together with upper cirrhi to the feet, 

 which are very simple, and bear no bundles of silky bristles. It appears that they vary with respect 

 to the existence of jaws. 



»S'. momlaris, Sa\'. [fi;;-ured in p. 391 07?/fJ, the iVt/'cw armUluris, IMuUev, of wliieh JM. S;i\'i^ny, williout having 

 seen it, proposes to make a genus, winch he terms Li/casfi-s, having tentacles and cinhi in ehaplt'ts, like a S\llis; 

 bat the former, represented to be of even number, requires farther examination. 



Glyceris, Cuv. — 



Are recognized by the form of the head, which terminates in a conical fleshy point, having the aspect 

 of a small horn, anil the summit of which divides into four very small tentacles, that are scarcely visi- 

 ble. The trunk of some of the s])eeics contains jaws, which cannot be perceived in others. 

 Such are AV/vm' alb't, Muiler, and Ch/c. Meduiii, Aud. & Edw. 



Nephthys, Cuv. 

 The trunk of Phyllodoce, but no tentacles; and on each foot two bundles of bristles widely sepa- 

 rated, and a cirrhus between tltem. 



LoMBuiNEREis, Blaiuv. — 

 Have no tentacles ; the body, considerably elongated, has merely a small forked tidjcrcle at each arti- 

 culation, which bears a little packet of sdky bristles. If there be any external respiratory organ, it 

 can only be the up[ier lobe r,f ihis tubercle. 



Nereis abrmirhlaUi, Toll., Luinhricus fragiUs, Muller, of which latter M. Blainville makes, but doubtfully, bis 

 gfuus i^coletomc. 



The fScolelepe, Blaiuv., which are only known liy the figure of Abildgaart (Linnlirlciis i-qniniititns), liave a very 

 slender body, with numerous rings, each of which has a cii'rhus that serves for a gill, and two bundles of silky 

 bristles, the lower of which seems to consist of a fold of skin compressed like a scale, and the liead has neither 

 jawy nor teidaclcs. 



Aricia., Sav., — 

 Have neither teeth nor tentacles. The body, which is lengthened, bears two ranges of lamelliform 

 cirrhi along the back ; and the anterior feet are furnished with dentelated crests, that do nut occur on 

 the other feet. 



Ar. Cufieiif Aud. and Edw. The Lnmhricus armiger, Muller, which M. Hlainvide, without having .spen it, pro- 

 poses to make a genus of, by the name of i<colople, ap[)ears to bave neither teetk nor tcntarles, and bears two 

 small simple bundles of short bristles on its first segments, and on the rest a bifid tubercle, a little bristle, and a 

 long anil pointed branchial lamina. 



Hesioxe. — 

 Have a short and rather thick body, composed of few ill-defined rings : a very long cirrhus, which pro- 

 bably fulfils tiie olhce of branchia?, occupying the upper part of each foot, which has also another 

 lower one, and a packet of silky bristles, and the trunk large, having neither jaws nor tentacles. 



Sucb are H- -sjilenJida, Savigny, U.fcstina, Id., and II. jm/i/Ztcri/ita, Risso. 



