ORDER DORSIBRANCHIA. 23 



having seen it, M. Savigny proposes to form a genus, which 

 he names Lycastis, has tentacula and cirrhi, bead-like, as in 

 Syllis ; but its tentacula are represented of an even number. 

 It has also need of a new examination. 



Glycera, Sav., are recognized by their head being in the 

 form of a fleshy and conical point, which has the appearance 

 of a little horn, and the summit of which is divided into four 

 very small tentacula, scarcely visible. The proboscis of some 

 still presents jaws. It is said that in others there is no ap- 

 pearance of this kind, iViere/s alha. Mull. ZooL, Dan. Ixxii. 

 6, 7. ; Glyc. Meckelii, Aud. and Edw. Littor. de la France. 

 Annel. pi. vi. fig, 1. 



Nephthys, Cuv. The proboscis of phyllodoce, but no 

 tentacula, and on each foot two bundles of bristles, very much 

 separated, between which is a cirrhus, Neplithys Homhergii, 

 Cuv. represented in the Diet, des Sc. Nat. 



LuMBRiNERA, Blainv., 



Want tentacula ; their body, very much elongated, has at each 

 articulation only a very small forked tubercle, fi:om which 

 issues a small bundle of bristles. If there be an external 

 organ of respiration, it can only be an upper lobe of this 

 tubercle, nereis ebrancliiata, Pall., Nov., Act. Petrop. ii. pi. vi. 

 f. 2 ; Lomhrinere hrillant, Blainville, pi. of the Diet, des Sc. 

 Nat. ; Lmnhricus fragilis,M.\x\\., Zool. Dan. pi. xxii., of which 

 M. Blainville makes, but with some hesitation, his genus 

 SCOLETOMA. 



N. B. The ScoLOLOPES, Blainville, which are known 

 only by the figure of Abildgaardt, Lumhricus squamatus, Zool. 

 Dan. IV. civ. 1 — 5., have a very slender body, with numerous 

 rings, to each of which is a cirrhus serving as a gill, and two 

 bundles of bristles ; the inferior of which seems to issue fiom 

 a fold of the skin, compressed like a scale ; their head has 

 neither jaws nor tentacula. 



