16 Prof. M‘TIntosh’s Notes from the 
In the male the upper ventral bristles are longer and thicker, 
as well as longitudinally striated—a condition not present in 
the female. In the eightieth foot the differences between 
the dorsal and ventral bristles is less pronounced. Red ova 
appear in the female in the twentieth segment, usually four 
in each (Southern). 
In the family of the Cheetopteridze it was mentioned that 
tubes of Spiochetopterus typicus, Sars, had been procured 
in St. Andrews Bay, and since in Loch Linnhe. 
Hach 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 lamelle 
occur laterally below the foregoing, and bear very trans- 
parent hooks, the outline of which is somewhat triangular, 
with a round apex, a thickened 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 difficult to make 
out their outlines, and they escaped Sars. 
Phyllochetopterus anglicus, Potts, was discovered by 
Mr. 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 aud 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 differences 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 Claparéde pointed out in P. socialis, afew 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 
