DOMIBRANCHIATJB. 



but a single bundle of setae. It appears that there is some variety re- 

 lative to the existence of the jaws *. 



GLYCERA, Sav. 



The Glycera? are recognized by their head, which is a fleshy and 

 conical point resembling a small horn, and divided at the summit 

 into four scarcely visible tentacula. The proboscis of some still pre- 

 sents jaws, in others, they are said to be imperceptible f. 



NEPHTHYS, Cuv. 



The proboscis of the Phyllodoces but no tentacula ; two bundles 

 of widely separated setae on each foot, between which is a cirrus J. 



LUMBRINERA, BlctinV. 



The tentacula wanting ; big a single small forked tubercle, from 

 which issues a little bundle of setae, on each articulation of the elon- 

 gated body. If there be any external organ of respiration, it can only 

 consist of an upper lobe of this tubercle . 



ARICIA, Sav. 



The teeth and tentacula wanting ; two ranges of lamellated cirri on 

 the back of the elongated body ; anterior feet furnished with notched 

 crests not found on the others ||. 



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 branchiae, 



Syllis monilaris, Sav., Eg., Annel., IV, f. 3, copied Diet, des Sc. Nat. 

 N. B. The Nereis armillaris, Mftll., Ver., pi. ix, of which, without having seen it, M. 

 Savigny proposes to make the genus LYCASTIS, has tentacula and cirri formed like 

 a rosary as in Syllis, but the tentacula are represented as being iu even numbers. It 

 should be examined. 



f Nereis alba, Miill., Zool. Dan., Ixxii, 6, 7 ; Glyc. Meckelii, Aud., and Edw., 

 Littor. de la Fr., Annel., pi. vi, f. 1. 



J NephthysHombergii,C\iv., Diet, des Sc. Nat. 



Nereis ebranchiata, Pall. Nov. Act. Petrop., II, pi. vi, f. 2; Lontbrinere 

 brilliant, Hlainv., pi. of the Diet, des Sc. Nat. ; Lumbriats fragilis, Mull., Zool. 

 Dan., pi. xxii, of which, but with hesitation, M. De Blainville makes his genus 



SCOLETOMA. 



N.B. The SCOLOLKPES, lllainv., which are only known by the fig. of Abildga- 

 ardt (Lumbricus squamatus, Zool. Dan., IV, civ, 1 5,) have a very slender body 

 with numerous rings, each furnished with a branchial cirrus and two bundles of 

 setae, the inferior of which seems to proceed from a fold of the skin compressed like 

 a scale ; their head has neither jaws nor tentacula. 



|| Aricia Curieri, Aud., and Edw., Litt., de la Fr., Annel., pi. vii, f. 5 13. 



The LumltricHs armiyer, Mull., Zool. Dan., pi. xxii, f. 4 and 5, of which, without 

 having seen it, M. de Ulainville proposes to form a genus by the name of SCOLOPLE, 

 appears to want both teeth and tentacula, and to have simple small bundles of short 

 ettt on its first segments, and a bind wart, a small seta, and a long pointed bran- 

 chial lamina on the others. 



