DORSIBRANCHIAT^, 459 



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

 sents jaws, in others, they are said to be imperceptible(l). 



Nephthys, Cuv. 



The proboscis of the Phyllodoces but no tentacula; two bundles 

 of widely separated setae 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 setse, 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(3). 



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(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 bran- 

 chiae, on the top of each foot, which has another beneath with a bun- 

 dle of setae; a large proboscis with neither tentacula nor jaws. 



(1) Nereis alba. Mull., Zool. Dan., Ixxii, 6, 7; Glyc. Meckelii, And., andEdw., 

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



(2) Nephthys Hombergii, Cuv., Diet, des Sc. Nat. 



(3) Nereis ebranchiata, Pall. Nov. Act. Petrop., II, pi. vi, f. 2;~Lombrinere 

 brilliant, Blsanv., pi., of the Diet, des Se. Nat.5 Lumbricus fragilis. Mull., Zool. 

 Dan., pi. xxii, of whleh, but with hesitation, M- de Ulainville makes his genus 



SCOLETOMA. 



N.B. The ScoLoiEPEs, Blainv., 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 

 tike a scale; their head has neither jaws nor tentacula. 



(4) J^ricia Cuvieri, Aud., and Edw. , Litt., de la Fr., Annel., pi. vii, f 5 13. 



The Lumbricus armiger. Mull., Zool. Dan., pi. xxii, f 4 and 5, of which, with- 

 out having seen it, M. de Blainville 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 setse on its first segments, and a bifid wart, a small seta, and a 

 long pointed branchial lamina on the others. 



