Oaliy Marine Laboratory, St. Andrews. Ill 



raised button witli radiatinp^ lines. "When relaxed, however, 

 the aperture is surrounded by about thirty pointed papillae. 



The tube is of sandy nmd lined by secretion and is 

 readily broken by pressure. 



The fifteenth species is Pseuiloclymene rjundrilobata Sars, 

 which was dredjjed in the Outer llaaf, Skerries, Shetland, 

 by Dr. Gwyn Jeffreys, of whose successful labours in 

 Zetlandie waters mention has so often been made. In this 

 form the ce[)halic plate is distin;j;uished by the prominence 

 of the lateral margin on each side of the small mid-frontal 

 process, ap|)ioachiug Axiutliella in this respect, though the 

 lobes are less and the frontal process larger. The margin, 

 indeed, is consi)iciious all round, and in j)lace of the deep 

 notch o( Praaillella a shallow notch and a fold occur laterally, 

 whilst posteriorly the margin dips downward gently to a 

 median notch, which is thus less abrupt than in P.prceter- 

 niissa. The outline of the cephalic plate is ovoid, and the 

 keel arises rather behind a line between the lateral notches, 

 and passes forward as a narrow ridge to the mid-irontal 

 process. A furrow exists on each side of it, but the nuchal 

 grooves proper seem to be short and anterior in position, 

 forming two curved furrows, with the convexity outwards, 

 which anteriorly debouch on each side of the mid-froutal 

 process. On the ventral aspect behind the latter is a dark 

 band, but no distinct eyes are now observable. The mouth 

 forms a transverse slit with prominent furrowed lips 

 anteriorly and posteriorly, and radiating grooves laterally. 

 Arwidsson desciibes the proboscis as provided with papillse. 



The bristles consist of stronger forms with straight shafts, 

 tapered tips, and distinct wings, the wing running distally 

 into a peculiar flattened region which ends in the tapered 

 tip, but no serrations could be made out. The delicate 

 slender forms taper to a hair-like tip, but spikes could not be 

 seen in the preparation. 



The first seven segments and the anterior part of the 

 eighth are markedly glandular, all having pi'orainent belts 

 in front, and the ventral streak is distinct from the mouth 

 backward. The first three segments bear sfrong spines, with 

 curvatures of both shaft and tip, the tip of the spike of the 

 third segment being luost distinctly hooked. The fourth 

 has a row of hooks with long curved shafts, the great fang 

 makes a larger angle with the neck than in the typical form, 

 and the gular bristles seem to be rudimentary, yet the hook 

 has much of the character of the type. The latter, as at the 



