Gatty Marine Laboratory, St. Auclrewa. 15 



being short, bent at an angle, and with broad wings — the 

 whole reseml)ling a beak. The curved shafts dilate ironi the 

 base to the neck, where a slight constriction occnrs, then it 

 bends forward and tapers to the sliort tip. In son^e views 

 slight grooves appear on the enlarged basal part of the tip, 

 so that they at first sight resemble the long hooks of 

 Terebellides and other forms. The posterior hooks are 

 smaller, their necks longer, and the bases more obliqne. 

 Some examples occur in a tube of tough secretion, with fine 

 sand-grains attached, after the manner of the firm tubes of 

 the Canadian examples of P. torelli. 



Amongst the masses of the foregoing Sabella, BC, from 

 Berehaven, are a few characterized by the striking madder- 

 brown pigment-spots on the bianchiee, and without the 

 general arrangement of the pigment cliaracteristic of the 

 former Sabellid. Yet in the disposition of the cephalic 

 collar the two forms a[)pear to be identical. It is true some 

 of them show seven anterior segments with bristles, but 

 others have the normal number — and some, which apparently 

 have lost the cephalic plate and other parts, have fewer. 

 Injury or abnormality also would explain the occurrence of 

 the median ventral furrow from the first scute backward. 

 The anterior hooks and their accompanying bristles and the 

 posterior hooks are identical. 



Polamil/a incerta, which Dr. Allen procured by the dredge 

 on Yealm ground, Plymouth, seems to be the young of 

 Potamilla torelli, and in this Prof. F'auvel agrees. Indeed, 

 it is difficult to find satisfactory distinctions between Pota- 

 milla reniformis and P. torelli, for the absence of ocular 

 points on the branchial filaments may not be of capital 

 importance. 



A single example of Laonome kroijeri, Malmgren, the 

 fifth form, was obtained by the dredge on a muddy bottom 

 in Inishlyre Harbour by Mr. Southern, who kindly for- 

 warded it for examination. The cephalic collar is somewhat 

 low, being deepest ventrally where the edges overlap at the 

 fissure. In the median line dorsally the gap is both wide 

 and depressed in front, and the edges of the collar there are 

 slightly reflected. The branchiae are short in proportion to 

 the length of the body and from fourteen to sixteen in 

 number. The filaments have a chordoid axis with narrow 

 transverse septa, and terminate in a slender tapering process. 

 The pinnae are short at the base, iucrejise in length till near 

 the tip, where they again diminish before reaclung the base 

 of the terminal filament. No pigment-specks were visible 



