GLYCERA. 185 



in a square within the orifice, or without jaws : no lateral series of 

 denticles : branchiae none, or small and papillary : feet lobulated, the 

 lobes subequal, the two mid ones setigerous, with a pale-coloured 

 spine in each. 



* Emaxillary. 



1 . G. mitis, proboscis without jaws ; no branchiae ; dorsal cirrus 

 lobe-like, as large but less prominent than the central lobes ; ventral 

 cirrus short and papillary. Length 12" ; breadth 3'". 



Hab. Shores of Scotland, Dr. Greville. 



Obs. In spirits the worm is of a light brown colour with a strong 

 cupreous or bronzed lustre, and highly iridescent, which is uncommon 

 in this family. The specimen was fully a foot in length, but it had 

 become very soft, and was 4'" in its greatest diameter. The segments 

 are extremely numerous, estimated at not less than 240, narrow, di- 

 midiate, smooth. The feet are all alike in conformation, small at 

 first, but they soon become larger and fully developed, and continue 

 so to the very extremity. Each foot consists of six lobules, of which 

 the upper is the superior, and the under the inferior cirrus, while 

 two of the intermediate are the setigerous branches. The bristles of 

 the upper branch are simple and setaceous ; those of the under 

 bifasciculate, compound, the terminal piece dovetailed into the shaft, 

 acicular and sharp- edged. The feet resemble those of G. Rouxii ; 

 nor would I have separated the worm as a species had I not satisfied 

 myself that there were no jaws. It has no relation with G. unicor- 

 nis of Savigny, which is equally emaxillary. 



(a) Scotland, Br. Greville. 



** With four jaws : no branchial lobules. 



2. G. dubia, segments biannulate, alike ; setigerous lobes triangulate, 

 rather shorter than the other lobes, which are papillary, and scarcely 

 larger than the dorsal cirrus ; inferior cirrus short and small. 

 Length 4-8" ; breadth 4'". 



Glycera dubia, Blainv. Diet, des Sc. nat. Ivii. 484, with a fig. in the 



Atlas, copied in Griffith's Cuvier, xiii. t. 4. f. 1. 

 Glycera Rouxii, Aud. ^ M.-Edw. Litt. de la France, ii. 242. pi. 6. 



f. 5-10. Grube, Fam. Annel. 60. 

 Nereis tricolor, Mus. Leach. 



Hab. South Devon. 



Desc. Worm subcylindrical, being equally convex on the dorsal 

 and ventral surfaces, elongated, tapered from about the middle to 

 the tail, of a light brown colour, with a copper or bronzed lustre, 

 iridescent, smooth ; the rings extremely numerous, very narrow, 

 many of them marked across with yellowish streaks. Head small 

 and undefined, produced into a conical cornute snout, having the 

 apex crowned with four spreading papillary antennae. Mouth 



