Gatty Marine Laliorafori/, Sf. Andrewa. 15 



bcinj; short, t)riit at an aiifjle, and \vifli broad win«;s — tlie 

 whole resembling a beak. The cnrved shafts dilate from tlie 

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

 bonds forward and tapers to the short tip. In son'c views 

 slight grooves a])pear on tlie enlarged basal part of the tip, 

 so that they at first sight rcseni])le the long hooks of 

 TenbeUides and otiier forms. 'J'hc posterior hooks are 

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

 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 foregoiiig Sabe/la, BC, from 

 Berehaven, are a few characterized by the striking madder- 

 brown pigment-sj)ots on the branchiae, and witliout the 

 general arrangement of the pigment chai'acteristic of the 

 former Sabellid. Yet in the disposition of the cephalic 

 collar the two forms appear to be identical. It is true some 

 of them show seven anterior segments with i)ri^tles, l)ut 

 others have the normal numtjer — and some, which a))pareiitly 

 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. 



Potomilla incerta, which Dr. Allen procured by the dredge 

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

 Potamilla torelli, and in this Prof. Fauvel agrees. Indeed, 

 it is difficult to find satisfactory distinctions between Pota- 

 viilla renifurmis and P. torelli, for the absence of ocular 

 points on the branchial filaments may not be of capital 

 importance. 



A single example of Laonome kroyeri, ^lalmgren, the 

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

 in Inisliiyre 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 doisally the gap is hoth wide 

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

 slightly reflected. The branehite are short in proportion to 

 the length of the body and from fourteen to sixteen iu 

 number. The filaments have a chordoid axis with narrow 

 transverse septa, and terminate in a slender tapering process. 

 The pinnie are short at the base, increase in length till near 

 the tip, where they again diminish before reaelung the hasc 

 of the terminal filament. No pigment-specks \>ere visible 



