ETTPHROSYNE. 233 



in the Mediterranean examples. The segments range from twelve to twenty-four. The 

 body terminates posteriorly in two somewhat globular anal cirri. 



The bristles of the dorsal lamella are all bifid (Plate XXXV, figs. 5 a and 5 b), the some- 

 what delicate process resembling a web stiffened by the spiculge. They are arranged with 

 considerable regularity, and are all characteristically curved. A sensitive papilla also 

 occurs at the tip of each lamella laterally. 



Feet. — These are more or less cylindrical. One conspicuous hook (Plate XXXV, 

 fig. 5 c) in the British example projected beyond each foot, generally another of similar 

 form (but shorter) within the tip, and the developing extremities of two in the tissues. 

 A group of simple bristles (eight to twelve) with tapering tips also accompany the 

 central hook. 



Von Graff found considerable variation in the condition of the alimentary canal, so 

 that he made two series, viz. the Stenocoela and the Euryccela. He mentions also, as 

 Grube had previously done, that the ova wander into the bases of the feet, and probably 

 are the " opaque white spots " seen in the Hebridean example. The ripe ova have short 

 protoplasmic processes in the body, which elongate subsequently into structures like 

 pseudopodia, somewhat symmetrically arranged as in a Radiolarian. The spermatozoa 

 present a head with an acute tip, two granules at the base, and a long filament. 



Grube's original description was carefully drawn up, and he gave the chief features 

 in regard to form and coloration, though his examples were small, having only twenty- 

 two parapodia. He, however, placed too much reliance on the reddish-orange colour as 

 distinctive from Johnston's species. Von Graff w r as at first inclined to place the 

 Hebridean example under 8. arcticus, Wiren, but further investigation showed that it 

 was S. miniaceus. 1 



It is probable that the Sjpinther arcticus of Sars (1861) is this species, and there is 

 nothing in his description to invalidate this view. As already mentioned, the adoption of 

 his name would lead to considerable confusion. 



Genus IV. — Etjphrosyne, Savigny, 1820. 



Body generally short, oblong, equally narrowed at either end, segments not 

 numerous ; two thick styles posteriorly. Cephalic lobe narrow, frontal part narrowest, 

 a band passing downward to the inferior ridge. Eyes both on the dorsal and ventral 

 surfaces. One median tentacle situated in front of eyes. Lateral tentacles two, very 

 short, springing in front of the inferior eyes. Fascicles of bristles arranged on each side 

 of the segments. Superior bristles forming a transverse row, no barbs ; inferior grouped 

 in a broad pencil. Capillary bristles unequally bifurcate. Dorsal cirri two (or three — 

 Ehlers) on each side, the one at the inner border of the fascicle, the other at the outer 

 margin. Ventral cirri single. Branchiae dorsal, in row r s, and more or less ramose. 

 Palpi forming fixed lobes on each side of the mouth. Mouth opening on the ventral sur- 

 face and extending over several segments. Buccal apparatus complex, alimentary canal 

 simple. 



1 Vide ' Ann. Nat. Hist./ August, 1890, p. 182. 



