PTGOSPIO ELEGANS. 189 



Winged hooks commencing on the eighth segment. The row anterior to the bristles and 

 the inferior ventral by-and-by disappear. Eggs have no transparent vesicles in the 

 chorion. 



1. Pygospio elegans, Claparede, 1863. Plate XCIII, fig. 2; Plate XCVI, figs. 9 and 9 a 

 —head and tail; Plate XCVII, fig. 8— foot; Plate XCVIII, fig. 14— head ; Plate 

 CVI, figs. 1—1 e — bristles and hooks. 



Specific Characters. —A small form in minute sand-tubes. Head bluntly bifid, with 

 a median ridge running backward to the second segment. Eyes two, four, or six. 

 Tentacles very long and attenuate. Body about an inch in length, with narrow segments 

 (forty to sixty) anteriorly, followed by wider, and the aspect posteriorly is moniliform. 

 Branchias commence on the thirteenth segment and continue for twenty, -more or less, the 

 superior lamella forming an outer crenate border to the tip. Anteriorly the feet have 

 conical dorsal lamella and smaller conical ventral lamellae, but the latter soon diminish. 

 At the eighth segment the winged hooks appear usually in fours, but posteriorly there are 

 seven. The bristles follow the ordinary arrangement, viz. superiorly longer tapering 

 bristles directed dorsally, and shorter forms beneath in the upper division. They are very 

 slender and much elongated posteriorly. Colour yellowish anteriorly, with a reddish 

 streak from the dural blood-vessel, then the body becomes pale brownish from the gut, 

 the tint fading posteriorly, whilst the four caudal processes are pure white. 



Synonyms. 

 1863. Pygospio elegans, Claparede. Beobacht., p. 37, pi. xiv, figs. 27 — 31. 

 1865. „ „ De Quatrefages. Annel._, t. ii, p. 446. 



1884. Spio Bathburnij Webster and Benedict. U. S. Comm. Fish and Fisheries, p. 640 ; fig. 4 (1881). 

 1888. ? Spio seticomis, Cunningham and Ramage. Trans. Roy. Soc. Edinb., xxxiii, p. 640. 

 1894. Pygospio minutus, Griard. C. R. Soc. Biol., 10 e ser., i, p. 246. 

 1896. „ elegans, Mesnil. Bull. sc. Fr. et Belg., t. xxix, p. 175, pi. xi, fig. 1 — ] 7. 



1909. „ „ Mcintosh. Ann. Nat. Hist., ser. 8, vol. iii, p. 166. 



1910. „ ,, Southern. Proc. Roy. Irish Acad., vol. xxviii, p. 232. 



Habitat. — Abundant in sandy tubes in fissures of the East Rocks, St. Andrews ; in 

 muddy cracks of the rocks, between tide-marks, and by splitting the rocks near the mouth 

 of the harbour, St. Peter Port, Guernsey ; in sanely tubes amongst the rocks, Cobo Bay, 

 Guernsey ; and in similar tubes at White Cliff Bay, Isle of Wight (A. M., R. M., and 

 W. CM.) ; Howth (Southern) ; Granton, Firth of North (Cunningham and Ramage). 



Coast of Normandy (Claparede). Shores of the Channel, along with Poly dor a ciliata 

 and Fabricia (Giard and Mesnil). Virginia? (Webster and Benedict). 



A minute form, in which the snout is slightly bifid and somewhat expanded in front, 

 the median process or ridge being continued backward and ending bluntly between the 

 first and second segments (Plate XCVI, fig. 9, and Plate XCVIII, fig. 14). The eyes 

 vary in number, for occasionally only a single pair are present on the ridge about the 

 middle, whilst in others there are three pairs of small black eyes situated behind the middle 

 of the ridge and between the tentacles, and it may be with a seventh speck on one side 

 posteriorly. In a few instances two eyes occur on one side and three on the other, On 



