OCR Text |
Show 458 ' ANNELIDES. ALCIOP A, Au d. and M. Edw. The mouth and tentacula nearly similar to those of the Phyllodoces; but the feet, independently of the tubercle which supports the setre and the two foliaceous cirri or branchire, are furnished with two branchial tubercles which occupy their superior and inferior edges( I). SPio, Fab. and Gm. The body slender; two very long tentacula which have the ap~earance of antennre; eyes in the head and on each side of every segment of the body; branchire in the form of a simple filament. They are small worms from the Arctic Ocean that inhabit membranous tubes(2). SYLLis, Sav. An odd number of tentacula articulated like the beads of a rosary, as well as the superior cirri of the feet, which are simple and have but a single bundle of setre. It appears that there is some variety relative to the existence of the jaws(3). GLYOERA, Sav. The Glycerre are recognized by their head, which is a fleshy and conical point resembling a small horn, and divided at the summit Nereis stellifera, Mull., Zool. Dan., pl. lxii, f. 1, of which, without having seen it, Savigny proposes to make a genus by the name of LEl'IDIA; and the N.longa, Ott., Fabr., placed by Savig. with theN. jlava in his genus ETEONE: All these Ann elides require to be carefully examined according to the detailed method of M. Savigny. We must not confound these Phyllodoces of Savigny with those of Uanzani, which are allied to the Aphroditre, and particularly to the Polynoes. (1) .lllciopa Reynaudii, Aud., and Edw.,-from the Atlantic Ocean.-Thepre· tendedNais Ratltke, Soc. Hist. Nat. Copen., V, part J, pl. iii, f, 15, mayveryposs· ibly be an Alciopa. (2) Spio seticornis, Ott., Fabr., Berl., Schr., VI, v, 1-7;-Spio filicornis, lb., 8-12. The PoLYDORlE, Bose., Ver. I, v, 7, appear to me to belong to this genus. Spio, the name of a Nereid. (3) Syllis monilaris, Sav., Eg., Annel., IV, f. 3, copied Diet. des Sc. Nat. N.B. The Nereis armillarls, Mull., Ver., pl. i:x:, of which, without having seen it, M. Savigny proposes to make the genus LYOASTis, has tentacula and cirri formed like a rosary as in Syllis, but the tentacula are represented as being in even num· hers. It should be examined. DORSIBRANCHIAT JE. 459 into f~ur sc~rcely visible tentacu!a· The proboscis of some still presents Jaws, 1t1 others, they are said to be imperceptible( 1 ). NEPHTHYS, Cuv. The proboscis of the Phyllodoces but no tentacula; two bundles of widely separated setre on each foot, between which is a cirrus(2). LuMBRINERA, Blainv. The tentacula wanting; but a single small forked tubercle, from which issues a little bundle of setre, on each articulation of the elongated body. If there be any external organ of respiration, it can only consist of an upper lobe of this tubercle(3). ARIOlA, Sav. The teeth and tentacula wanting; two ranges of lameiiated cirri on the back of the elongated body; anterior feet furnished with notched crests not found on the others( 4). Several species of these genera are found on the Atlantic coast of France. HEsiONE, Lam. A short thick body composed of but few and feebly marked rings; a very long cirrus, that probably exercises the functions of branchice, on the top of each foot, which has another beneath with a bundle of setre; a large pr~boscis with neither tentacula nor jaws. (1) Nereis alba, Mull., Zool. Dan., lxxii, 6, 7;-Glyc. Meckelii, Aud., and Edw., Littor. de la Fr., Annel., pl. vi, f. l. {2) Nephtltys Hombergii, Cuv., Diet. des Sc. Nat. (3) Nereis ebranchiata, Pall. Nov. Act. Petrop., II, pl. vi, f. 2;-Lombrinere brilliant, Blainv., pl., of the Diet. des Sc. Nat.;-Lumbricus fragilis, Mull., Zool. Dan., pl. xxii, of which, but with hesitation, M. de lllainville makes his genus ScoL:&TOMA· N.B. The ScoLOLEPEs, Bla.inv., which are only known by the fig. of Abildgaardt (Lumbricus squamatus, Zool. Dan., IV, c1v, 1-5), have a very slender body with numerous rings, each furnished with a branchial cirrus and two bundles of seta:, the inferior of which seems to proceed from a fold of the skin comprellsed like a scale; their head has neither jaws nor tentacula. (4) JJ.ricia Ouvieri, Aud., and Edw., Litt., de la Fr., Anne!., pl. vii, f. 5-13. The Lumbricus armiger, Mull., Zool. Dan., pl. x:x:ii, f. 4 and 5, of which, without having seen it, M. de Blainville proposes to form a genus by the name of ScotoPLE, appears to want both teeth and tentacula, and to have simple small bundles of short setre on its first segments, and a bifid wart, a small seta, and a long pointed brancl\iallamina on the others. |