204 LYSILLA LOVENL 



Habitat. — Dredged in St. Magnus Bay, Shetland, by Dr. Gwyn Jeffreys. 



Malmgren's examples came from the Koster Islands ; Vardo (Danielssen) ; 

 Bergenfjord (Wollebaek). Sweden (Malm). Atlantic and northern waters (Hessle). 



The cephalic plate passes forward from a small dorsal collar and is thrown into 

 various folds, the edges of which appear to be somewhat thinner than in Polycirrus, and 

 hence show a more elegantly frilled margin. Ventrally the plate forms a broad flap fixed 

 laterally but with the inner edge free. The surface is covered with numerous clavate and 

 grooved tentacles, but the ventral flaps have clusters of more minute filiform organs. 

 The mid- ventral region behind the mouth has a large and prominent tongue-shaped 

 process, smoothly continuous with the oral surface anteriorly, where it is fixed ; it is free 

 and somewhat conical posteriorly. In lateral view it forms, indeed, a spout-like process 

 at right angles to the body, with an elevation (glandular) in the centre. 



The body is enlarged anteriorly, marked by the two lateral rounded bands minutely 

 tuberculated and ringed, the largest tubercles or papilla being on the ventral surface of 

 the longitudinal bands. The segments are not distinctly defined except by the setigerous 

 processes in front, but Malmgren states that the posterior region (absent in the British 

 example) presented about twelve deep sulci. He gives the length of 30 — 50 mm. and the 

 width of the tumid anterior region as 5 — 6 mm., that of the posterior part 2 — 2*5 mm., 

 and the latter, though minutely ringed, is smooth. 



Six setigerous processes occur anteriorly in the groove, though no bristles are visible 

 under a lens. Each consists of a slightly conical process with a curved tip .and 

 presenting a white streak in the interior due to the bristles (Plate CXXVII, fig. 3), 

 which consist of a single closely arranged fascicle of simple translucent bristles, which 

 curve distally in conformity with the outline of the process, and end within the tissues at 

 the tip. Except for stiffening the setigerous processes these bristles are thus devoid of 

 function. In the foregoing segments are the nephridia. It is curious that in a variety 

 of this species, var. macintoshi, from the Antarctic seas, Gravier found the tips of the 

 bristles spatulate. 



Sub-family III: No representative of Malmgren's Sub-family III, Artacamacea, 

 occurs in Britain unless the fragment described below pertains thereto, but the fourth 

 sub-family has two examples. 



A fragment of the posterior end of a small annelid procured from a specimen of 

 Gellepora dredged off St. Peter Port, Guernsey, in 1868, presents certain features of 

 interest. It is apparently a tubicolar form, of firm consistence, and measuring scarcely 

 a quarter of an inch in length, rounded dorsally and with a distinct mid- ventral groove 

 from end to end. It tapers from the anterior to the posterior end/ the pygidium being 

 smooth, with a slight swelling on each side in front of it. The segments are numerous 

 for so minute a form, no less than between 60 and 70 occurring on the fragment, those 

 in front being considerably wider than those near the tip of the tail. The feet in the 

 anterior part of the fragment bear prominent lamellse armed with hooks on the free 

 edge and it was the structure of these (Plate CXXVa, fig. 9 a) which first drew attention 

 to the animal. They have four teeth above the main fang, so that the crown is high, 

 thus approaching those of Artacama proboscidea. A hook of the latter is shown in 

 Plate CXXVa, fig. 9. 



