Gatty Marine Laboratory, St. Andrews. 163 
2, On Harmothoé watsoni, M‘/., an var. H. marphyse, M‘J. 
Whilst studying the structure and habits of Lagis koreni, 
Malmgren, forwarded from Lanfairfechan, in North Wales, 
Mr. Arnold Watson found a Polyroid as a commensal in the 
tube of an adult annelid and he kindly sent it for examina- 
tion along with some remarks on its condition in life. It 
measured about one-fifth of an inch in length, with white 
scales bearing reddish-brown markings, which at their interior 
ends jomed to form crescents. Anteriorly was a red disk, 
probably due to the cephalic gangha. ‘The median tentacle 
was long, and one anal cirrus was seen, though most of the 
dorsal cirri had been shed. 
No scales remained on the body which had a fairly regular 
outline from the even disposition of the feet. The head is 
less elongated than in Harmothoé marphyse, and in the 
preparation retained a pale brownish hue, with the usual 
median groove enlarging at the anterior peaks. The pre- 
sence of these anterior peaks, which the dark pigment at 
the base of the median tentacle more clearly differentiates, 
the large size of the eyes, and the shorter head distinguish this 
form from H. marphyse. All the eyes are visible from the 
dorsum, though the anterior pair, from their slightly lateral 
position, are less distinct than the posterior pair, which le 
in front of the nuchal border. The anterior eyes are some- 
what in front of the middle of the head, and thus separated 
from the posterior pair by a considerable interval, whilst 
they are also more distinctly lateral. Both pairs are, how- 
ever, visible in a lateral as well as in a dorsal view, and all 
are of medium size, considerably larger than those of 
H. marphyse. The median teutacie is long and furnished 
with clavate papillae. The lateral tentacles are inferior and 
in the preparation have slightly enlarged or probe-shaped 
tips. ‘The palpi are of moderate length with tapered 
extremities, and their surface is smooth. ‘The tentacular 
cirri are comparatively short and have slender tips, whilst 
the surface has a few clavate papille. 
The body is normal in shape, and thus differs from that 
of H. marphyse, being slightly narrowed in front and more 
distinctly diminished posteriorly. The number of bristled 
segments is about thirty. When the scales are removed, a 
translucent bar, the proboscis, appears behind the head. 
The teet have a regular arrangement from frout to rear, and 
the pale bristles project beyond them with similar regularity. 
A typical foot presents dorsally the cirrus, which is enlarged 
at the base and tapered distally, with numerous clavate 
papilla. The tip of the organ does not project much beyond 
