140 Prof. M‘Intosh’s Notes from the 
North Sea* 
Station 18a. 455 m. No. 29. 18.6.1906. Procured 
with the small trawl. 
The shelly tubes of this form exactly resembled those 
of the other varieties. The annelids, whose bodies were of 
moderate length, are characterized by the free development 
of the branchiz, which possess large filaments, and long and 
rather slender pinnze with scarcely a trace of enlargement 
at the tips. The filaments do not appear to show any 
glandular thickenings suchas occur in Salmacina edificatrix. 
At the extremities the filament, which is comparatively 
broad at the last pinna, gradually tapers to a blunt point. 
In one example with eight pairs of anterior bristles the 
two dorsal filameiits were modified in an interesting manner, 
since one presented a somewhat thick terminal process, the 
pp of which was abruptly bevelled mainly on one side, the 
tapering tip being rather blunt, its cellular structure other- 
wise remaining the same as its neighbours ; whilst the other 
had advanced a stage further, the clavate tip being unequally 
bevelled and hollowed so as to form a rudimentary operculum. 
This example carried ova well forward in the posterior region, 
but as it was imperfect, too much reliance need not be given 
to this feature. The region frequented by this colony 
seemed to be highly favourable, for in another example the 
tips of the branchial filaments were irregularly enlarged. 
Station 18a. 14.38.1907. Trawl. 
Ivyes present. 
The type consisted of comparatively short bodies, with 
seven pairs of anterior bristles, and about twenty-five seg- 
ments posteriorly, comparatively long branchial fans—fully 
half the length of the body, and with opercula. The form 
of the opercula, however, varied considerably from the thin, 
translucent, and more or Jess circular or hoof-shaped cup to 
a long vase with a tapering process on the lip, a bluntly 
clavate termination, or a cone at the end of the filament. 
The short bodies are terminated by the two anal papille 
So far as could be observed, no reproductive elements were 
present. food was abundant in the stomach, and the 
intestine had the elliptical foecal masses. 
The structure of the collar-bristles is identical with that 
in the St. Andrews examples. 
Station 10. 27.5.1907. 
These were characterized by small, thin, wineglass-shaped 
* T am indebted to Prof. D’Arcy Thompson for the opportunity of 
examining these. 
eos Metab 
