POLYCttiETA OL^ THE L.M.B.C. t)[STRICT. 165 



*Dasijchone herdmani, n. sp. (PI. XV, figs. 1 — 9.) 

 Hab : Puffin Island and off the coast of Anglesey, from 

 low water to 18 fms. Stations 5, G, 10, P. 



The body is short and thick, composed of about 60 

 segments. The anterior or thoracic region is about as 

 broad as long, having 8 bristle-bearing segments. The 

 dorsal edges of the cephalic collar incline towards each 

 other and nearly touch. Thence the collar is continued 

 as a slightly everted rim of even height, terminating in 

 two boldly everted lappets on each side of the median 

 ventral line. A shallow notch separates the lappets from 

 the rest of the collar laterally. The branchiae are in tw^o 

 equal tufts of 15 — '20 filaments each. Apex of each radiole 

 is naked, rather stout or digitate. The distal pinnae 

 rapidly diminish and end as mere bud-like eminences at 

 the base of apex. At equal distances on the rachis are 

 disposed paired e3^e- spots. Between each two pairs of eye- 

 spots is a pair of dorsal appendages ; usually the position 

 is just behind one of the pairs, but in some specimens it 

 is nearly midway between the two. In shape they are 

 ample, long, and broadly spathulate, the margin of the 

 broad apex being puckered and indented. There are in 

 general 20 — 22 pairs of these processes on each filament 

 and an equal number of eye-spots. The tentacula are 

 two in number, channelled on the opposing faces, acumin- 

 ate, about a third as long as the filaments. 



Colour. Body of dark yellowish or brownish red ; a 

 dark brown spot below each tuft of capillary setae in the 

 thoracic region, but above each tuft in the posterior or 

 abdominal portion of the body. Collar pale and uncoloured 

 as are also the tentacula. The branchiae are white, beauti- 

 fully variegated with narrow bands of intense purple, 

 brown and yellow\ 



The tube is short and corrugated, dark grey in colour 



