40 PECTINAPIA BBLGICA. 



1912. Pectinaria helgica, Wollebaek. Skriv. Vid.-selsk. Krist., No. 18, p. 39, pi. iii, figs. 9—11. 



„ „ „ A. H. Meyer. Inaug. Dissert. Kiel., p. 10. 



1914. „ „ Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 130. 



„ „ „ Mcintosh. Ann. Nat. Hist., ser. 8, vol. xiii, p. 84. 



1917. „ ,, Hessle. Zool. Bidr. Uppsala, 5, p. 75. 



Habitat. — Off the Hebrides, July, 186(3 (Dr. Gwyn Jeffreys) ; Loch Linnlie, off 

 Castle Walker; "Knight Errant," 1882 (Sir John Murray); Berehaven, Ireland, Royal 

 Irish Academy's Expedition, 1885 (Prof. A. C. Haddon) ; large tube? off the Bell Pock, 

 St. Andrews (W. C. M.) ; Dublin Bay and Killary Harbour (Southern) ; Plymouth 

 (Spence Bate and Brooking Powe). 



Abroad it extends to Sweden ; Finmark (Norman) ; Magellan (Ehlers) ; Belgium 

 (Pallas?). 



The crown in this species has ten to fourteen paleolae, which are broader than those 

 of Lagis Koreni, and, as P. helgica, is often larger, they are stronger and more indi- 

 vidualised, but their curves are similar, the convexity being ventral. They dilate a little 

 above the base and then taper to a very delicate, hair-like tip, which from the lines at its 

 sides would seem to indicate relationship with a winged bristle. Friction, however, 

 removes the delicate extremity in some. The outer paleola is shorter than the adjoining 

 one, whilst the two inner appear also to be smaller in most examples. In the largest 

 example from British waters in the collection, viz., from Loch Linnhe, fourteen paleolae 

 occurred on the left and ten on the right. Above the paleolae is the tough, firm and 

 slightly corrugated surface of the crown, which has a proportionally broader rim than in 

 L. Koreni. Having reached its greatest diameter laterally it curves ventrally a little 

 within the edge of the paleolae, and ends at the long anterior cirrus. The margin 

 dorsally and laterally is smooth, but on the ventral curve to the paleolae it has one or two 

 small papilla?. After the cirrus the edge slopes backward to form the pillars at the sides 

 of the mouth. 



The veil is more restricted than in any of the allied forms, and its outline is fan- 

 shaped, the anterior edge having ten or eleven rather large tapered papillae or fimbriae 

 and the edges a few others as they pass to the anterior region of the mouth. 



The tentacles arise immediately behind the veil, and form a considerable group on 

 each side. They have the usual shape, and the extremities in the preparations, as in life, 

 are often clavate. Numerous smaller forms occur posteriorly, and all are attached to a 

 surface continuous with, and forming part of, the veil, and these are in front of the mouth 

 dorsally. The small lateral fold of the veil to a certain extent forms a guard antero- 

 lateral^. A broad fillet occurs on each side of the mouth posteriorly, and a median fold 

 completes it behind. 



The second cirrus arises laterally a little behind the margin of the crown and is along 

 subulate tapering organ. A ridge passes ventrally from it on each side, meeting its fellow 

 in the middle line behind the mouth, and may be taken to represent a segment. The 

 next two are branchial segments, each having the typical branchia of the group, viz. a 

 series of flat lamellae largest internally and diminishing externally, attached to the 

 basal and posterior stem. The second is smaller, but of similar structure. These 



