186 GLYCERACE^. 



with a long proboscis longitudinally striated, and consisting of two 

 distinct portions, the basal more membranous and narrower than 

 the distal, which is covered with small papillae that give the sur- 

 face a tomentose appearance under a common magnifier. Feet all 

 alike in conformation : those of the anterior rings are not very 

 protuberant and are proportionably small, but proceeding backwards 

 they soon become sensibly more developed and continue so to the 

 very extremity. Each foot is divided into five unequal lobules, of 

 which the superior represents the cirrus, and is rather shorter than 

 the setigerous lobules. These are equal in length, papillary ; and 

 behind them are two lobules (branchial ?) more compressed and 

 obtuse. The inferior cirrus is small, and at the base of the foot. 

 The bristles are colourless and really in two brushes, but the ventral 

 brush is divided into two parcels, kept separate by the intervention 

 of a lobule. The bristles of this brush are compound, the point 

 being let into a deep cleft in the shaft, and shaped like a fine spear, 

 being brought to a sharp edge on each side and terminated acutely. 

 The bristles of the dorsal brush are longer, simple, tapered, slightly 

 bent, and acute. To each brush there is a single spine. The anal 

 segment has two short styles. 



The specimen from which this description was made was fully a 

 foot in length, but it was softened by long immersion in spirits. 

 The greatest diameter was 4 lines. The proboscis was three- 

 quarters of an inch in length ; the orifice without tentacular fila- 

 ments ; nor could any jaws be discovered on a careful search. The 

 number of annuli could not be reckoned, but an estimate made them 

 not less than 240, each with its pair of feet. The head has no eyes, 

 nor other appendage. 



I have considered my specimen as identical with G, Rouxii, from 

 the exact similarity of its feet to those of that species, as delineated 

 by Audouin and M.-Edwards. I could, however, detect no jaws 

 within the proboscis. 



Obs. A large species, somewhat compressed, although convex on 

 both surfaces. There is a median line down the back, and on the 

 ventral surface there is a median space defined by an impressed line 

 on each side. The feet are about the length of a quarter of the 

 body's diameter. It is less highly coloured and iridescent than G. 

 mitis. The figure of Blainville represents the specimen in the British 

 Museum so well, that one is led to conjecture that it is the very spe- 

 cimen Blainville had from Dr. Leach. 



(«) South Devon, Mus. Leach. 



3. G. capitata, head not papillary at the rings ; segments biannulate, 

 even ; setigerous branches of the foot coalesced into one large lobe 

 with a pointed apex ; dorsal cirrus in the form of a small wart on the 

 side above the basis of the foot. Length 2-3". Plate XV. a. fig. 1-1 0. 



Glycera alba, Johnston in Ann. 8f Mag, Nat. Hist. xv. 147. pi- 9. 

 f. 1-10. Williams, Rep. Brit. Assoc. 1851, 172. pi. 2. f. 6, and 235. 

 pi. ll.f. 61. 



