DORSIBRANCHIAT.E. 
137 
but a single bundle of setae. It appears that there is some variety re- 
lative to the existence of the jaws * * * § . 
Glycera, Sav. 
The Glycerae 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, Cav. 
The proboscis of the Phyllodoces but no tentacula ; two bundles 
of widely separated setae on each foot, between which is a cirrus 
LuArBRiNERA^ Blciinv. 
The tentacula wanting ; lua^ 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 oi’gan of respiration, it can only 
consist of an upi)er lobe of this tubercle §. 
Aricia, Sav. 
The teeth and tentacula wanting ; two ranges of lamellatedcirrion 
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. 
* Siillis monilaris, Sav., Eg., Annel., IV, f. 3, copied Diet, des Sc. Nat. 
N.B. The Nereis urmiUaris, Mull., Ver., pi. ix, of 'which, -vNithout 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 in even numbers. It 
should be examined. 
-f- Nereis alba, Midi., Zool. Dan., Ixxii, 6, 7 ; — GJi/c. Meckelii, Aud., and Ediv'., 
Littor. de la Fr., Annel., pi. vi, f. 1. 
X Nephthys Hombergii, Cuw, Diet, des Sc. Nat. 
§ Nereis ebrunchiafa, Pall. Nov. Act. Petrop., II, pi. vi, f. 2; — Lombrinere 
briUiunt, Blainv., pi. of the Diet, des Sc. Nat. ; — Lumbricus fruejUis, Midi., Zool. 
Dan., pi. xxii, of which, but with hesitation, M. De Blainville makes his genus 
SCOI.ETOMA. 
N.B. The ScoLOLEPES, Blainv., which are only known by the fig. of Abihlga- 
ardt {Lumbricus squumutvs, Zool. Dan., IV, civ, 1 — 5,) have a very slender body 
with numerous rings, eaeh furnished with a branchial cirrus and two bundles of 
setpe, the inferior of which seems to proceed from a fold of the skin compressed like 
a scale ; their head has neither jaws nor tentacula. 
II Aricia Cuvieri, And., and Edw., Litt., de la Fr., Annel., pi. vii, f. 5 — 13. 
The Lumbricus armiyer, Mull., Zool. Dan., pi. xxii, f. 4 and 5, of which, without 
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 
setae on its first segments, and a bifid wart, a small seta, and a long pointed bran- 
chial lamina on the others. 
