16 Prof. M'lntosh's Notes from the 



III tlicmalc the upper ventral bristles are loiipjer and thicker, 

 as Mill as lonj;itii(liiially stiiated — a coiitlitioii not pri'sciit in 

 the female. In the eightieth foot the ilift'erenees hetwceu 

 the dorsal and ventral bristles is less pronouneed. IJcd ova 

 appear in the female in the twentieth segment, usually four 

 in each {Soui/ieni). 



In the family of the Chretopteridre it was mentioned that 

 tubes of Spiucft(Pioj>terus iypicus, Sars, had been procured 

 in St. Andrews Bay, and since in Loch Linnhe. 



Each segment posteriorly in the sole imperfect example 

 secured (Loch Linnhe) has dorsally a pair of setigerous pro- 

 cesses bearing a group of about four bristles, with long 

 shafts and flattened spear-like tips. Two flaps or lameliaj 

 occur laterally below the foregoing, and bear very trans- 

 parent hooks, the outline of which is somewhat triangular, 

 with a round apex, a thielicned anterior margin, which is 

 probably minutely serrated, though in the preparations such 

 was not seen, and ending inferiorly in a short main fang. 

 The transparence of these organs renders it diflScult to make 

 out their outlines, and they escaped Sars. 



Phyllochcetopterus angUcus^ Potts, was discovered by 

 ]\Ir. Potts at Plymouth in 1913, and though it presents 

 close relationships with forms he had met with on the 

 Pacific coast of Canada, and appears to be intermediate 

 between P. prolifera and P. socialis, Clap., yet he considers 

 that it merits specific distinction, not only because the 

 tubes run parallel, and are not, as a rule, adherent, 

 though connected, but for the morphological characters of 

 the animal. Further investigations, however, in view of the 

 cosmopolitan distribution of many similar forms, and the 

 necessity of allowing a wide margin for variations, may tend 

 to minimise the present difl'erences shown in the careful and 

 well-illustrated description of Potts. 



The British species appears to live in water of some depth 

 south of the Eddystone, and had been captured by trawlers. 



In connection with the structure of the peristomial ap- 

 pendages. Potts considers that, since the second pair contain, 

 as Claparede pointed out in P. socialis, a few slender capillary 

 bristles, they may represent the modified dorsal division of 

 the foot of the segment. 



"While giving a full description of the bristles, Potts does 

 not give details of the minute hooks, which escaped both 

 Sars and Grube. They are very minute translucent struc- 

 tures, somewhat conical in outline, with a long curved 



